NO. ' REV. NO • . • ~ I
ATM 854 A A2 ALSEP Data Transmitter Failure Mode, Effects and Criticality Analysis PAGE 1 OF
~ Systems Division
DATE 6/15/70
The Failure Mode, Effects, and Criticality Analysis for the A2 ALSEP Data Transmitter contained herein is based on the released schematic drawings identified in the FMECA work sheets.
The present FMECA effort deviates slightly from ATM 243 11 Instructions for Use in Conducting the Failure Mode, Effects, and Criticality Analysis 11
in that it does not make use of the 11 System Effect Numbers 11 (E). The reasons for this deviation are:
(1) in a redundant end item, the System Effect Numbers are not applicable.
(2) the present approach enables the derivation of the transmitter reliability in terms of part failure modes and their probabilities of occurrence, and the derivation of probabilities of occurrence for the end-item failure modes.
This document is prepared in accordance with the requirements of the Reliability Plan RA-01 of contract NAS 9-5829.
"r:t The Failure Mode, Effects, and Criticality Analysis has been updated to reflect the modifications to the Data Transmitter circuit since the original release of this ATM. The current analysis reflects to circuit configuration shown in Bendix drawing 2344601, revision G (with ECN 2344601 G2). Based on this circuit configuration, the Transmitter has a ''failure mode 11
reliability prediction of • 98901.
Revised by: T. W. ox
49
ALSEP Reliability Department
Approved by: Q vn c. .. YJ~j P. McGinnis ALSEP Reliability Department
NO. REV. NO.
: : I ~ A2 ALSEP: Data Transmitter Failure Mode, Effects and Criticality Analysis (FMECA)
ATM-854
PAGE 2
A
OF
DATE 6/15/70
I. 0 SCOPE
This report presents a Failure Mode, Effects and Criticality Analysis performed on the Data Transmitter and documented in the attached worksheets.
The objectives of this analysis are:
1. Establish the effect of the individual part failure modes on the operation of the Data Transmitter
2. Establish the probability of occurrence of each recorded part failure mode for the mission duration of one year
3. Establish the most predominant Transmitter failure modes, and their probability of occurrence
4. Establish the most predominant part failure modes in terms of probability of occur renee
5. Establish the Transmitter reliability from the point of view of Failure Mode, Effects and Criticality Analysis.
This FMECA effort refers to one Transmitter unit only, and not to the redundant set-up.
2. 0 SUMMARY OF FINDINGS
Table 1 high-lights the Transmitter FMECA findings.
Table 1 tabulates the Transmitter (end-item) failure modes in the order of decreasing probability of occurrence, their probability of occurrence (unreliability), and their criticality ranking which is a qualitative evaluation of the effects of these end-item failure modes on the ALSEP equipment mission.
The summation of the unreliabilities of the Transmitter failure modes is also an expression of the Transmitter reliability which is . 98901; this figure compares favorably with the reliability design goal of . 985 for one Transmitter unit for a one year mission. Both of the above figures exclude the Transmitter telemetry circuitry.
49
: :. I A2 ALSEP: Data Transmitter Failure Mode, Effects and Criticality Analysis (FMECA)
NO.
ATM-854
PAGE 3
REV. NO.
II
OF 49
DATE 6/15/70
3. 0 FMECA AND RELIABILITY PREDICTION
One of the objectives of this FMECA effort is to determine the Transmitter reliability on the basis of the part failure modes that could have an adverse effect on the Transmitter operation. The reliability figure arrived at through this study is . 98901. This figure does not reflect the partial failure rates of all those parts whose catastrophic failure modes of opens and shorts could have no effect on the Transmitter operation. Such part failure modes whose occurrence could have 11 no significant effect" on the Transmitter have a probability of occurrence of 464.2 x lo- 5. Furthermore, for practically all electronic parts (excepting varactor diodes, oscillator crystal, sensitors and thermistors whose ''drift" is more significant) the failure mode of parameter drift was found to have "negligible effect" on the Transmitter operation. These "drift" failure modes have not been recorded on the FMECA worksheets, even though they were considered in this study, for the purpose of high-lighting the effects of the catastrophic failure modes (i.e. opens and shorts) of the Transmitter constituent electronic parts.
A "standard 11 reliability prediction per MIL-STD-7 56A shows the Transmitter to have a reliability estimate of . 97492. This standard prediction employed 11total 11 part failure rates derived from ATM 605. The same basic failure rates are used for FMECA, except this time failure rates per failure mode are used. This is accomplished through the breakdown of the part "total" failure rate into failure mode components. The component failure mode failure rates are denoted by the symbol of a in column 2 of the FMECA worksheets; this data is obtained from ATM 243.
: : . ~ A2 ALSEP: Data Transmitter Failure Mode, Effects and Criticality Analysis (FMECA)
NO.
ATM-854
PAGE 4
REV. NO.
OF 49
Aerospace Systems Division
DATE 2/5/70
4. 0 CRITICALITY RANKINGS (C. R.)
Criticality rankings, as used in Table 1 of this report, are qualitative evaluations of the Transmitter failure mode effects on the ALSEP mission. These rankings are based on the following definitions:
C. R. I End-item failure modes that totally disable the ALSEP mis sian.
C. R. II End-item failure modes that partially disable the ALSEP mission, such as loss of data of some experiments or partial loss of data of any one experiment.
C. R.III
c. R.rv
End-item failure modes that have "no (adverse) effect" on the ALSEP mis sian on account of end-item redundancy.
End-item failure modes of redundant end-items whereby the subject end-item functions are somewhat degraded. The "degraded" end-item could be useable, but it could also be replaced by the standby (redundant) end-item.
5. 0 FMECA METHODOLOGY
The Data Transmitter FMECA has been performed in the manner shown in the attached worksheets. This effort follows the steps described below:
1. Identify: Name of System, end-item and subassembly; also identify subassembly drawing number and operating time of subassembly for the duration of the ALSEP mission.
2. Enter in Column 1 the symbol of the part whose failure modes and effects are considered.
3. Enter in Column 2 the part failure mode considered, and its incidence ratio (a) in relation to all of the part's failure modes.
: ; I ~ A2 ALSEP: Data Transmitter Failure Mode, Effects and Criticality Analysis (FMECA)
NO.
ATM-854
PAGE 5
REV. NO.
OF 49
DATE 2/5/70
4. Enter in Column 3 the effects of the subject failure mode on the subject subassembly. This 11effect 11 is described concisely in a most descriptive and most recognizable statement. Ordinarily, it is best to enter here the "subassembly" failure mode; at times though, it is clearer to indicate what happens to a certain stage (i.e. Ql cut off or saturated, whereupon the output signal could be zero).
5. Enter in Column 4 the effects of the subject failure mode on the end-item output functions. Where ever possible, quantitative data is entered here; where ever quantitative date is extremely difficult to arrive at, concise qualitative statement could be entered.
6. Enter in Column 5 the failure mode probability of occurrence. This figure (aQ ; a A. t) is the product of the subassembly operating time throughout the mission, the part generic failure rate obtained from the Parts Application Analysis (PAA) worksheets and the failure mode incidence ratio obtained from A TM 243 and given in Column 2. The part failure rate obtained from the PAA worksheets already reflects the part's duty cycle.
7. Once the end-item FMECA is complete, evaluate all part failure modes in terms of probability of occurrence, and enter failure mode unreliability (Q) rank in accordance with the definition given below:
The part failure mode with the highest probability of occurrence is ranked FM Q #1; the one with the next lower probability of occurrence is ranked FM Q #2, and so on.
Item
1
2
3
4
5
Table 1. Summary of Transmitter Failure Modes
Effect of XMTR FM's XMTR Failure Modes (FM) on A2 ALSEP Equipment
Total loss of RF power output. No effect due to XMTR (Po ; 0 watts) redundancy
Major decrease (loss) in RF power output (!_'o< < 1 watt)
Minor decrease in RF power output (!_'o <1 watt)
Same as above
Minor effect on XMTR performance; if such degradation is unacceptable, the redundant XMTR can be used.
RF output signals loose all No effect due to XMTR modulation redundancy
RF output signals have erro- No effect due to XMTR neous modulation redundancy
n = 5
FM Probability of occurrence: Q x 10-S
610.7 (x10- 5 )
213.6
143. 3
114. 9
16.4
\ l Q=l098.9x1o-5
i = 1
XMTR Reliability (R) = 1 -.LQ = 1 - 1098.9 x 10-S = • 98901
A1. d54
XMTR FM Criticality Ranking
III
III
IV
III
III
~ 1:J > (b Ill 1-3 < (JQ '7 • (b ~
)> a- d. 0 Ul """~ ~
-..!)
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component
SUB-ASSY: Osc., Buffer, Multiplier No. :..'I'M 854
Mission DWG. NO.: 2344656 A Time: 8760 hrs
Effects o£ Failure
Symbol Failure Mode (FM) a Sub-Assembly End-Item
Cl Open (. 70) Ql output impedance (Zo) XMTR power output detuned; output signal (Po) is practically (Eo) greatly decreased. zero (Po = 0 watts)
Short (. 30) Circuit power supply is Po = 0 watts grounded
C2 Open (. 70) No effect; redundant No effect
Short (. 30) Loss o£ oscillator signal Po = 0 watts
C3 Open (. 70) Minor effect in signal No significant effect amplitude on XMTR Po
Short (. 30) Loss of signal Po = 0 watts
C4 Open (. 70) Same as with C2 open No effect
Short (. 30\ Same as with C2 short Po = 0 watts
C5 Open (. 70) Loss of signal Po = 0 watts
Short (. 30) Ql cutoff; loss of signal Po = 0 watts
C6 Open (. 70) Signal output is greatly Po = 0 watts reduced.
Short (. 30) Circuit becomes unstable Po = 0 watts (oscillatory)
REV.
Date: 27 Jan 70
Engr.: C. S.
Probability o£ occurrence FM Unreliabili (aQ)xl0- 5
Rank ty
• 245 35
• 165 36
. 245 35
• 165 36
. 245 35
• 165 36
.245 35
. 165 36
. 245 35
. 165 36
. 245 35
'"d> Ill t-3
• 165 36 ~ ~ I
~00 0 Ul ,_.,,j::..
,j::..
"'
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component
SUB-ASSY: Osc., Buffer, Multiplier No. ATM 854 Mission
DWG. NO.: 2344656 A Time: 8760 hrs.
Effects of Failure
Symbol Failure Mode (FM) a Sub-Assembly End-Item
C7 Open (. 70) Loss of oscillations Po = 0 watts
Short (. 30) Same as open Po = 0 watts
C8 Open (. 70) Loss of oscillations Po = 0 watts
Short (. 30) Same as open Po = 0 watts
C9 Open (. 70) Ql Zo becomes detuned Po ';;; 0 watts
Short (. 30) Signal path is grounded Po = 0 watts
CIO Open (. 70) Signal path is open Po = 0 watts
Short (. 30) Q1 Zo becomes detuned rJ
Po = 0 watts
"' Cll Open (. 70) Same as with CIO short Po = 0 watts
Short (. 30) Same as with C9 short Po = 0 watts
C12 Open (. 70) Increase in signal ripple No effect on XMTR Po
Short (. 30) Shorted power supply Po = 0 watts
Cl3 Open (. 70) Loss of oscillations Po = 0 watts
Short (. 30) Same as open Po = 0 watts
REV.
Date:27 Jan 70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (aQ) x 10- 5 Rank
y
1.840 23
. 788 29
.245 35
. 16 5 36
1.840 2.3
• 788 29
.245 35
. 165 36
• 245 35
• 165 36
• 307 34
• 131 37
• 245 35 1:J;p Ill t-3
~ ~ • 165 36 oo' 00
0 U1 ...... H::>. ~ -.!)
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET REV.
SYSTEM: A2 ALSEP SUB-ASSY: Osc., Buffer, Multiplier No. ATM 854 Date: 27 Jan 70 Mission
END ITEM: Data Transmitter DWG. NO.: 2344656 A Time: 8760 hrs. Engr. ~ C. S.
Effects of Failure Probability
Part/ Component of occurrence FM Unreliabilit Symbol Failure Mode (FM) a Sub-Assembly End-Item (aQ) x 10- 5
Rank y
Cl4 Open (, 70) No effect; redundant No effect • 245 35
Short (. 30) Shorted power supply Po = 0 watts . 165 36
0;15 Open (. 70) Detuned network; Eo is Po << l watt 1.840 23 -very small
Short (. 30) Same as with C9 short Po = 0 watts . 788 29
Cl6 Open (. 70) Same as with Cl4 open No effect . 245 35
Short (. 30) Same as with C14 short Po = 0 watts • 165 36
C17 Open (. 70) Same as with C 15 open Po « 1 watt • 245 35 -
Short (. 30) Same as with C9 short Po = 0 watts . 165 36
Cl8 Open (. 70) Same as with C l 0 open Po = 0 watts 1.840 23
Short (. 30) Minor effect on signal No significant effect . 788 29 on XMTR Po.
Cl9 Open (. 70) Same as with CIS short No significant effect . 245 35
Short (. 30) Same as with C9 short Po = 0 watts " 165 36
>a> Ill 1-j
~ ~ I
"' 00 \]1
0 ,j:>. ...... ,j:>.
"'
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component
SUB-ASSY:Osc., Buffer, Multiplier No. ATM 854
Mission DWG. NO.: 2344656 A Time:8760 hrs.
Effects of Failure
Symbol Failure Mode (FM) a Sub-Assembly End-Item
C20 Open (. 70) Major decrease in signal Po~ 0 watts amplitude
Short (. 30) Q3 cut off Po = 0 watts
C21 Open (. 70) Same as with C 1 0 open Po = 0 watts
Short (. 30) Q2 cut off; could operate Po':;; 0 watts class B, but Ein is small
C22 Open (. 70) Major decrease of signal Po<< 1 watt amplitude,
Short (. 30} Q4 saturated Po = 0 watts
C23 Open (. 70) Same as with C 10 open Po = 0 watts
Short (. 30) Q3 detuned, Eo too small po << 1 watt
C24 Open (. 70) Same as with C23 open Eo<< 1 watt
Short (. 30) Same as with C9 short Po = 0 watts
C25 Open (. 70) Q4 Zo detuned; Eo consid Po -:::; 0 watts erably decreased
Short (. 30) Q4 shorted Po = 0 watts
REV.
Date: 27 Jan 70
Engr.: C. S ~
Probability of occurrence FM Unreliabilit (aQ) x 10- 5 Rank
y
. 245 35
. 165 36
• 245 35
. 165 36
.245 35
. 165 36
1.840 23
• 788 29
. 245 35
• 165 36
1. 840 23
. 788 29 f-t:J::t> Pl f-3 ~ ~ ....... ooo 0 U1 ....... ~
*"" ...0
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM:Data Transmitter
Part/ Component
SUB-ASSY: Osc., Buffer, Multiplier No. ATM 854
Mission DWG. NO.: 2344656 A Time:8760 hrs.
Effects of Failure
Symbol Failure Mode (FM) a Sub-Assembly End-Item
C26 Open (. 70) Signal amplitude is :po >> 1 watt increased considerably
Short (. 30) Minor effect No effect
C27 Open (. 70) Same as with Cl2 open No effect
Short (. 30) Shorted power supply Po = 0 watts
Rl Open (. 05) No significant effect No effect
R2 Open (. 0 5) Ql & Q2 cut off; no Po = 0 watts oscillations
R3 Open (. 05) Ql cut off; no oscillations Po = 0 watts
R4 Open (. 05) Q2 cut off; no oscillations Po = 0 watts
R5 Open (. 0 5) Ql Zo detuned slightly No significant effect on Po.
R6 Open (. 05) Minor effect on signal No effect level and frequency
R7 Open (. 05) Q3 & Q4 cut off; no signal Po = 0 watts output
REV.
Date: 27 Jan 70
Engr.: C. S. -------
Probability of occurrence FM Unreliabilit (aQ) x 10- 5
Rank y
. 245 35
. 165 36
. 307 34
. 131 37
. 073 40
• 073 40
.073 40
.073 40
.073 40
. 073 40
. 073 40 11> Ill f-3 ~ ~ ....... ,_.00
lTI 0 ~ ,_., ~
"'
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component
SUB-ASSY: Osc. , Buffer, Multiplier No. ATH 854 Mission
DWG. NO.: 2344656 A Time: 8760 hrs.
Effects of Failure
Symbol Failure Mode (FM) Cl' Sub-Assembly End-Item
R8 Open (. 05) Minor effect on Q3 Zo. No effect
R9 Open (. 05) Q4 operates class B, and Po~ 0 watts its input signal is small.
RlO Open (. 0 5) Open signal path Po = 0 watts
Rll Open (. 05) Minor effect on signal No significant effect amplitude and frequency
Rl2 Open (. 05) Same as with R l 0 open Po = 0 watts
Rl3 Open (. 05) Q4 saturated; Eo ::: 0 volts Po = 0 watts
Rl4 Open (. 05) Open signal path Po = 0 watts
Rl5 Open (. 0 5) Q4 cut off Po = 0 watts
R16 Open (. 05) Minor impedance mi s- No significant effect match to modulator Zin on Po
CRl Open (. l 0) Q2 cutoff; no oscillations Po = 0 watts
Short (. 30) Ql & Q2 cut off Po = 0 watts
CR 2 Open (. l 0) Q2 saturated; no oscillatic ~Po = 0 watts
!Short (. 30\ Q2 cut off Po = 0 watts
REV.
Date: 27 Jan 70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (aO) x 10- 5 Rank
y
. 073 40
. 073 40
.073 40
.073 40
. 073 40
• 073 40
. 073 40
• 073 40
. 073 40
5.633 14
16.899 3
1:J::r> 5.633 14 Ill 1-j
~ ~ ,_.I
16.899 3 Noo I.J1
0 H:>. ...... H:>. ...0
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM:A2 ALSEP
END ITEM: Data Transmitter
Part/ Component
SUB-ASSY: Osc., Buffer, Multiplier No. ATM 854 Mission
DWG. NO.: 2344656 A Time: 8760 hrs.
Effects of Failure
Symbol Failure Mode (FM) Cl' Sub-Assembly End-Item
CR3 Open (. 1 0) Same as C 10 open Po = 0 watts
Short (. 30) Osc. signal looses X5 Po = 0 watts, unless frequency multiplier; Eo the tuned circuits is Zero unless tuned pick-up harmonics circuits pick-up harmoni s where-upon normal
Po would be deliv-ered by XMTR
Drift (. 60) Minor effect on frequenc' No effect on Po. multiplication
Y 1 (crystal) Open (. 25) No oscillations Po = 0 watts
Short (. 05) No oscillations Po = 0 watts
Drift (. 70) Minor change in oscilla- No effect tion frequency, but tuned circuits deliver correct signal
Ql Open [CB/BE] (. 2 5) No oscillations Po = 0 watts
Short[BE / CE] (. 25) Same as open Po = 0 watts
Q2 Open [CB/BE] (. 25) Same as Ql open Po = 0 watts
Short [ CE/BE] (. 25) Same as Q1 short Po = 0 watts
REV.
Date: 27 Jan 70
Engr.: C. S. -------
Probability of occurrence FM Unreliabilit (aO) x 10- 5 Rank
y
8.760 9
26. 280 2
52.56 1
4.380 17
. 876 28
12.264 8
4.270 18
4.270 18
4.270 18 '"d> Ill 1-j
4.270 18 ~ ~ ....... woo
lJ1 0 ,j>. ..... ,j>.
"'
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET REV.
SYSTEM: A2 ALSEP SUB-ASSY: Osc., Buffer, Multiplier No. ATM 854 Date: 27 Jan 70 Mission
END ITEM: Data Transmitter DWG. NO.: 2344656 A Time: 8760 hrs. Engr. :__::C~·:....:S~·~---
Effects of Failure Probability Part/ Component of occurrence FM Unreliabilit
Symbol Failure Mode (FM) 0:' Sub-Assembly End-Item (aO) x 10- 5 Rank y
Q3 Open (CB/BE] (, 25) No signal output Po = 0 watts 4.270 18
Short (BE] (.125) Same as open Po = .0 watts 2. 135 20
Short [CE] (. 125) Output signal is greatly Power Amplifier 2. 135 28 decreased. can not be driven;
hence, Po = 0 watts
Q4 Open ( CB /BE] (. 2 5) Same as Q3 open Po= 0 watts 4.270 18
Short [CE/BE] (. 25) Same as open Po = 0 watts 4.270 18
Ll Open (. 90) Minor decrease in signal No significant effect 15.768 5 amplitude on Po.
Short (. 1 0) Same as with R 1 open No significant effect 1. 752 25
L2 Open (. 90) No signal output Po = 0 watts 15.768 5
Short (. 1 0) Same as open Po = 0 watts l. 752 25
L3 Open (. 90) No oscillations Po = 0 watts 15.768 5
Short (. 10) Same as open Po = 0 watts l. 752 25
L4 Open (. 90) Same as L3 open Po= 0 watts 15.768 5 'I:J> Ill f-j
Short (. 10) Same as open Po = 0 watts 1. 752 25 ~ ~ ,_.I ~00
\.11 0 ~ .......
""" -..()
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component
SUB-ASSY: Osc., Buffer, Multiplier No. ATM 854 Mission
DWG. NO.: 2344656 A Time: 8760 hrs.
Effects of Failure
Symbol Failure Mode (FM) Cl' Sub-Assembly End-Item
LS Open (. 90) Open signal path Po = 0 watts
Short (. 10) Shorted signal path Po = 0 watts
L6 Open (. 90) No oscillations; Eo=Ovolts Po = 0 watts
Short (. 1 0) Increase in ripple No effect
L7 Open (. 90) No signal output Po = 0 watts
Short (. 1 0) Increase in ripple No effect
L8 Open (. 90) Same as L 7 open Po = 0 watts
Short (. 1 0) Signal is AC shorted Po = 0 watts
L9 Open (. 90) Same as L 7 open Po = 0 watts
Short (. 10) Practically no signal Po = 0 watts output.
--···-- --- ------ ·------------~--
RTl Open (.50) Same as R23 open (in TM Total loss of temp. subassembly) #2 TM Data
Short (. 25) Same as open Total loss of temp. #2 TM Data
Drift (. 25) Minor loss in circuit TM accuracy reduced sensitivity
' ·- ..... ···-···--------] No effect on 0/B/M INo effect on ·
subassembly. ltrans mitte r. _______ ,_ ... ._ ____ ----------------
REV. A
Date: I 5 June 70
Engr. :_C_._s_,. ___ _
Probability of occurrence FM Unreliabili (a Q) x 10- 5 Rank
ty
15.768 5
1. 752 25
15.768 5
1. 752 25
15.768 5
1. 752 25
15.768 5
1. 752 25
15.768 5
1. 752 25
--
(13.140) 6
(6. 570) 12 1:1> Ill 1-j
(6. 570) 12 ~ ~ ....... \.}100
\.}1
0 *"' ,_., *"' "-0
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP SUB-ASSY: Modulator
END ITEM: Data Transmitter DWG. NO.: 2344671 A
No. A.TM 854
Mission Time: 8760 hrs ----- -
Effects of Failure
Part/ Component Symbol Failure Mode (FM) Q' Sub-Assembly End-Item
Cl Open (. 70) Modulation becomes XMTR output signab erroneous; carrier are considerably signal is diminished diminished and have
erroneous modulatio
Short (. 30) Same effect as open Same effect as open
REV.
Date: 21 Jan 70
Engr.: C. S ---o-- -
Probability of occurrence FM Unreliabilit (aQ) X 10- 5 Rank
• 245 35
ps
• 165 36
C2 Open (. 70\ Signal modulation is lost; XMTR output consis s .245 35
carrier signal is of diminished carrie diminished with signals with no
modulation.
Short (. 30) Same as with C 1 open Same as with C 1 • 16 5 36 open.
C3 Open (. 70\ Minor effect on signal No significant effect 1.840 23
modulation
Short (. 30\ Signal modulation is lost XMTR output power . 788 29 has no modulation
C4 Open (. 70) No effect; redundant No effect • 307 34
Short (. 30) No significant effect No effect • 131 37
C5 Open (. 70) Same as with C4 open No effect . 307 34 "d~ Pl 1-3
Short (. 30) Same as with C4 short No effect .131 37 ~ ~ ....... 0'00
lJ1 0 ~ ...... ;!::>. '.()
y
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component
SUB-ASSY: Modulator
DWG. NO.: 2344671 A
No. ATM 854
Mission Time: 8760 hrs.
Effects of Failure
Symbol Failure Mode (FM) Q' Sub-Assembly End-Item
C6 pPen (. 70) No significant effect No effect
Short ( 0 30) Modulation signal is lost XMTR Po is not modulated
Rl Open (. 05) Carrier signal path is XMTR output power open is lost. (Po = 0 watts
R2 ppen (. 05) Modulator looses power Po = 0 watts supply
R3 ::>pen (. 05) Modulated signal path is fo = 0 watts open
R4 ppen (. 05) Minor effect on signal IM.inor effect on XMTI level output power output
R5 ::>pen ( 0 0 5) Modulated signal is not !:o < <. 1 watt !balanced
R6 ppen (. 05) !Modulation signal path ~MTR Po is not becomes open modulated
R7 ppen (. 05) pl cut off X:MTR Po is not modulated
R8 ppen (. 05) ::22 and CR 6 become cutoff KMTR Po is not modulated.
REV.
Date: 27 Jan 70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (aQ) x 10- 5 Rank
y
.245 35
0 165 36
.073 40
.073 40
.073 40
0 073 40
0 073 40
.073 40
0 073 40
1:l::Z:.. Ill 1-j
0 073 40 ~ ~ ........ -.]00
\J1 0 ,j:>. ..... ,j:>. -D
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP SUB-ASSY: Modulator
END ITEM:Data Transmitter DWG. NO.: 2344671 A
No. ATM 854 Mission Time: 8760 hrs
Effects of Failure
Part/ Component Symbol Failure Mode (FM) Q Sub-Assembly End-Item
R9 Open (. 05) Modulation signals XMTR Po has com-become completely pletely erroreous erroreous. modulation
Ql Open (CB/B/E] (.25) Same as with R6 open XMTR Po has no modulation
Short[CE/BE] (. 25) Same effect as open XMTR Po has no modulation
Q2 Open (CB/B/E] (. 25) Same as with Ql open XMTR Po has no modulation.
Short(CE/BE] (. 25) Same as open XMTR Po has no modulation.
CRI Open (. 10) Minor effect on signal No significant effect modulation on XMTR Po
Short (. 30) Same as with C3 short XMTR Po has no modulation
Drift (. 70) Minor change in signal No effect modulation
REV.
Date: 21 Jan 70
Engr.: C" S. -
Probability of occurrence FM Unreliabilit (aO)xl0- 5
Rank y
• 073 40
4.270 18
4.270 18
4.270 18
4.270 18
8.760 9
26.280 2
52o560 I
1:!~ Ill t-3 ~ ~ ,_.I oooo
U1 0 ~ ..... >J:>. -..()
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component
SUB-ASSY: Modulator
DWG. NO.: 2344671 A
No. ATM 854
Mission Time: 8760 hrs
Effects of Failure
Symbol Failure Mode (FM) 0' Sub-Assembly End-Item
CR2 Open (. 10) Same as with CRl open No significant effect
Short (. 30) Same as with CR 1 short XMTR Po has no modulation
Drift (. 70) Same as with CRl drift No effect
CR3 Open (. l 0) Modulation index is No significant effect changed slightly on XMTR Po
Short (. 30) Same effect as open No significant effect on XMTR Po
CR4 Open (. 10) Same as with CR 3 open No significant effect on XMTR Po
Short (. 30) Same as with CR3 short No significant effect on XMTR Po.
CR5 Open (. 10) No significant effect No effect
Short (. 30) Same as R6 open XMTR Po has no modulation
CR 6 Open (. 1 0) No modulated signals XMTR Po has no modulation
Short (. 30) Same effect as open XMTR Po has no modulation
REV.
Date: 21 Jan 70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (aQ)xl0- 5
Rank y
8.760 9
26.280 2
52.560 1
5.633 14
16.899 3
5.633 14
16.899 3
1.849 22
5.547 15
5.633 14
16.899 '"d~
3 Pl f-3 ~ ~ ....... -..DCXl
U1 0 ~ ...... ~ -..D
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component
SUB-ASSY: Modulator
DWG. NO.: 2344671 A
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
Symbol Failure Mode (FM) 11' Sub-Assembly End-Item
Ll Open (. 90) Signal modulation becomeE XM TR Po has com-completely erroreous pletely erroreous
modulation
Short (. 1 0) Minor RF interference No significant effect thru the power supply
L2 Open (. 90) Modulating signal path XMTR Po has no is open and varactor bias modulation ing voltage is increased.
Short (o 10) Considerable loss of Po « 1 watt modulated signal thru CR6
T1 Open (. 90) Loss of carrier signal Po = 0 watts
Short (. 1 0) Same as open Po = 0 watts
REV. "
Date: 21 Ian 70
Engr.: C.S.
Probability of occurrence FM Unreliabilit (aQ) x 10- 5
Rank y
15.768 5
1. 752 25
15o768 5
1. 752 25
15.768 5
1. 752 25
1:1~ {l) 1-3
~ ~ N' 000
\Jl 0 *"' ..... *"' --a
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
Cl Open (. 70)
Short (. 30)
C2 Open (. 70)
Short (. 30)
C3 Open (. 70)
Short (. 30)
C4 Open (. 70)
Short (. 30)
C5 Open (. 70)
Short (. 30)
C6 Open (. 70)
Short (. 30)
SUB-ASSY: Prearn.plifier
DWG. NO · 2344681 A
No. ATN 854
Mission Time· 8760 hrs
Effects of Failure
Q' Sub-Assembly End-Item
No effect; redundant No effect
Shorted power supply Loss of XMTR powe1 output (Po = 0 Watts)
Same as with Cl open No effect
Same as with C 1 short Po = 0 Watts
Preamp signal gain is Eo<< 1 watt considerably decreased thru feedback. Q 1 - QZ become cut off Po = 0 Watts
Circuit signal path be - Po = 0 Watts
comes open
Q1 operates class B Po';;; 0 Watts
Same as with C4 open Po = 0 Watts
Q1 Zo detuned Eo<< 1 watt
Minor effect since Q 1 No effect operates practically in saturation Same effect as open No effect
REV.
Date: 22 Jan 70
~ Engr c. s.
Probability of occurrence FM Unreliabilit (a Q) x 10- 5 Rank
y
.245 35
• 165 36
.245 35
.165 36
.245 35
o165 36
. 245 35
• 165 36
1.840 23
• 788 29
.245 35
1:))-Ill 1--3
. 165 36 ~ ~ Nl
00 ,_.U1
0 *"" ..... ;!:>. -.!)
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
C7 Open (. 70)
Short (. 30)
C8 Open (. 70)
Short (. 30)
C9 Open (. 70)
Short (. 30)
ClO Open (. 70)
Short (. 30)
Cll Open (. 70)
Short (. 30)
Cl2 Open (. 70)
Short (. 30)
SUB-ASSY: Preamplifier
DWG. NO.: 2344681 A
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
a Sub-Assembly End-Item
Circuit signal gain is Eo << 1 watt greatly decreased
Q2 operates class B po = 0 watts
Same as with C5 short Eo<< 1 watt
Shorted circuit signal Po = 0 watts path
Q2 Zo becomes detuned Eo<< 1 watt
Signal is grounded Po = 0 watts
Q3 Zo detuned Po<< 1 watt
Q3 looses Vee and be- Po = 0 watts comes cut off Circuit signal gain is Po<< 1 watt greatly reduced
Q3 operates class B and Po = 0 watts Q3 Zin is detuned
Same as with C4 open Po "' 0 watts
Q3 Zo becomes detuned Eo < < 1 watt
REV.
Date: 22 Jan 70
Engr. =~C. S.
Probability of occurrence FM Unreliabilit (aQ) x 10- 5 Rank
y
. 245 35
• 165 36
• 245 35
. 165 36
1.840 23
. 788 29
• 245 35
• 165 36
.245 35
.165 36
1.840 23 "d> jlJ 1-3
• 788 29 ~ s:: Nl
N~ 0 f.!>. ....., f.!>. -.!)
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
Cl3 Open (. 70)
Short (. 30)
Rl Open (. 0 5)
R2 Open (. 05)
R3 Open (. 05)
R4 Open (. 05)
R5 Open (. 05)
R6 Open (. 0 5)
R7 Open (. 05)
R8 Open (. 05)
R9 Open (. 05)
RIO Open (. 05)
SUB-ASSY: Preamplifier
2144681 A DWG. NO.: _______ _
No. ATM 854 Mission Time: 8760 hrs
Effects of Failure
0' Sub-Assembly End-Item
Same as with C l 0 open .!:o <-< l watt
Shorted signal path Po = 0 Watts
Same as with C4 open Po= 0 Watts
Ql - Q2 stages become Po = 0 Watts cut off
Minor effect Minor effect
Ql becomes saturated Po = 0 Watts and Q2 cut off
Q2 becomes saturated Po = 0 Watts
Q2 cut off Po = 0 Watts
Q3 operates class B .!:o < < 1 watt
Q3 saturated Po = 0 Watts
Q3 cut off Po = 0 Watts
Same as with C1 open Po = 0 Watts
REV.
Date: 22 Jan 70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (a Q) x 10- 5 Rank
y
• 245 35
• 165 36
.073 40
. 073 40
.073 40
• 073 40
• 073 40
• 073 40
.073 40
• 073 40
.073 40
. 073 40 '"d> PI f-3 ~ ~ N' wCXl
U1 0 >~:>-.....
*'" -..o
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP SUB-ASSY: Prean'lplifier
END ITEM: Data Transmitter DWG. NO.: 2344681 A
No. ATM 854 Mission Time: q760 hrR ' . ~ ~ ..............
Effects of Failure Part/ Component
Symbol Failure Mode (FM) a Sub-Assembly End-Item
Q1 Open [CB/B/E) (, 25) No Signal output Po = 0 watts Short [BE] (. 125) Signal output is zero Po = 0 watts Short (CE] (. 12 5) Output signal is near zero Po = 0 watts
Q2 Open [CB /B /E) (o 2 5) Same as with Ql open Po = 0 watts Short (CE] (. 12 5) Signal output is greatly Po~ 0 watts
reduced Short (BE] (. 12 5) Ql cut off Po = 0 watts
Q3 Open [CB/B/E) (. 25) Same as with Q1 open Po = 0 watts Short (CE) (. 12 5) Signal output is greatly Po~ 0 watts
reduced Short (BE) (. 12 5) Q3 cut off Po = 0 watts
L1 Open (. 90) Ql - Q2 cut off Po = 0 watts
Short (. 10) Increase in signal ripple No significant effect
L2 Open (. 90) Ql Zo detuned Po<< 1 watt
Short (. 10) No output signal Po = 0 watts
L3 Open (. 90) Same as with C4 open Po = 0 watts
Short (. 10) Q2 Zo is AC shorted Po = 0 watts
REV.
Date: 22 .Tan 70
Engr.: r._ .c:_ -
Probability of occurrence FM Unreliabili (crQ)x10- 5
ty
4.270 18 2. 135 20
2. 135 20
4.270 18 2. 135 20
2. 135 20
8.540 10
4.270 18
4.270 18
15.768 5
1. 752 25
15.768 5
1. 752 25
15.768 5
1. 752 25
Rank
1j Ill
(JQ ('!)
N ~
0 ..... ~
"'
> 1-j
~ CXl Ul ~
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET REV.
SYSTEM: A 2 ALSEP SUB-ASSY: Preamplifier ATM 854 No. _____ _ Date: 22 Jan 70 Mission
END ITEM: Data Transmitter DWG. NO.: 2344681 A Time: 8760 hrs. Engr.: C. S.
Effects of Failure Probability Part/ Component of occurrence FM Unreliabili
Symbol Failure Mode (FM) Q Sub-Assembly End-Item (a Q) x 10- 5 Rank
ty
L4 Open (. 90) Saine as with C4 open Po = 0 watts 15.768 5
Short (. 1 0) Q3 Zin detuned ]?o << 1 watt 1. 752 25
L5 Open (. 90) Q3 cutoff Po = 0 watts 15.768 5
Short (, 10) Increase in signal ripple No significant effect 1. 752 25
L6 Open (. 90) Q3 Zo detuned _I>o (( 1 watt 15.768 5
Short (. 1 0) Q3 Zo is AC shorted Po = 0 watts I. 752 25
L7 Open (. 90) Same as with L6 open Po <.< 1 watt 15.768 5
Short (. 1 0) Same as L6 short Po = 0 watts 1.752 25
'""d~ Ill ,_;:
OQ • CD a::: Nl Uloc
\.11 0 >I'> ..... ~ -.!)
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
Cl Open
Short
C2 Open
Short
C3 Open
Short
C4 Open
Short
C5 Open
Short
C6 Open
Short
SUB-ASSY: Power Amplifier
DWG. NO.: 2344640 B
No. AT.t-1 854 Mission Time: 8760 hrs
Effects of Failure
a Sub-Assembly End-Item
( 0 70) Open circuit signal path Total loss of XMTR power output (Po = 0 watts)
(. 30) Great mismatch presentee Great loss in XMTR to Pre-amp output power output impedance (Zo) (Po<< lwatt)
(. 70) Same as with C 1 short. Po<' ~· 1 watt -(. 30) Circuit signal path short- Po"" 0 watts
ed to ground.
(. 70) Same as with C 1 short Po -<. '< 1 watt ~
(. 30) Same as with C2 short Po = 0 watts
(. 70) Same as with C 1 open Po = 0 watts
(. 30) Q1 Zo becomes detuned Po<< lwatt
(. 70) Same as with C4 short Po<< 1watt -
(. 30\ Same as with C2 short Po = 0 watts
(. 70) Same as with C1 open Po = 0 watts
(. 30) Q2 Zo becomes detuned J>o << 1watt
REV.
Date: 27 Jan 70
Engr.: C.S.
Probability of occurrence FM Unreliabilit (aQ) x 10-S Rank
y
.920 26
. 395 32
.920 26
. 395 32
. 123 38
. 083 39
.245 35
• 165 36
.920 26
. 395 32
1.840 23
1:J~ 0 789 29 Pl 1-j
~ ~ N' 0'00
l1l 0 ,j::. ....... ,j::. --o
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
C7 Open
Short
C8 (Deleted)
C9 (Deleted)
ClO Open
Short
Cll Open
Short
Cl2 Open
Short
SUB-ASSY: Power Amplifier
DWG. NO.: 2344640 B
No. ATM 854
Mission Time: 8760 hrs
Effects of Failure
Q' Sub-Assembly End-Item
(. 70) Slight detuning of Q2 Zo Minor effect on XMTR Po.
(. 30) Q2-Q3 interstage tuned Po<< l watt circuit becomes detuned.
(. 70) Same as with C7 open Minor effect on Po.
(, 30) Same as with C7 short Po << l watt -
(. 70) Same as with C l open Po~ 0 watts
(. 30) Q3 Zin detuned !:o (< 1 watt
(. 70) Same as with C7 short Po << l watt -(. 30) Same as with C2 short Po -= 0 watts
REV. A
Date: 15 June 70
Engr.:.~C~·~S~-------
Probability of occurrence FM Unreliabilit (aQ)xlO-S Rank
y
• 123 38
• 083 39
.920 26
• 395 32
.920 26
. 395 32
. 920 26
. 395 32 1:1~ Ill ...,:
O'Q • ro ~ Nl -Joe
Ul
0 *"' ......
*"" '-!)
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
Cl3 Open
Short
Cl4 Open
Short
CIS Open
Short
Cl6 Open
Short
Cl7 (Deleted)
Cl8 Open
Short
Cl9 Open
Short
SUB-ASSY: Power Amplifier
DWG. NO.: 2344640 B
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
a Sub-Assembly End-Item
(. 70) Same as with Cl open Po = 0 watts
(. 30) Q3 Zo detuned Po<< 1 watt
(. 70) Q4 Zin detuned Po<-< 1 watt -(. 30) Same as with C2 short Po = 0 watts
(. 70) Same as with C 14 open Po<< 1 watt
(. 30) Same as with C2 short Po = 0 watts -
(. 70) Q4 Zo detuned Po<-< 1 watt
(. 30) Same as open Po<<lwatt
(. 70) Same as with Cl6 open fo << 1 watt
(. 30) Same as with C2 short Po = 0 watts
(. 70) Minor effect Minor effect on Po modulation
(. 30) Same as open Minor effect on Po modulation
REV. A
Date: 15 June 70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (aQ) x 10- 5
Rank y
1.840 23
. 789 29
• 920 26
• 395 32
. 123 38
.083 39
1.840 23
• 789 29
35
36
1.840 23
. 789 29
0 307 34 1::)~ Ill 1-j
~ ~ • 132 37 Nl
00~ ~
0 ..... ~ ._!)
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
C20 Open
Short
C21 Open
Short
C22 Open
Short
C23 Open
Short
C24 Open
Short
C25 Open
Short
C26 Open
Short
SUB-ASSY: Power Amplifier
DWG. NO.: 2344640 B
No. ATM 854 Mission Time: 8760 hrs
Effects of Failure
a Sub-Assembly End-Item
(. 70) Minor RF interference No effect
( D 30) XMTR power supply is Po • 0 watts shorted
{o 70) Same as with C20 open No effect
( D 30) Same as with C20 short Po = 0 watts
(. 70) Same as with C20 open No effect
(. 30) Same as with C20 short Po = 0 watts
(. 70) Same as with C20 open No effect
(. 30) Same as with C20 short Po = 0 watts
(. 70) Same as with C20 open No effect
(. 30) Same as with C20 short Po = 0 watts
(. 70) Same as with C20 open No effect
(. 30) Same as with C20 short Po = 0 watts
(. 70) Same as with C20 open No effect
(. 30) Same as with C20 short Po = 0 watts
REV.
Date: 27 Jan 70
Engr.: C. S.
Probability of occurrence FM Unreliabili (a.Q) x 10- 5 Rank
ty
• 307 34
• 132 37
. 307 34
• 132 37
• 307 34
• 132 37
. 307 34
• 132 37
• 307 34
• 132 37
• 307 34
• 132 37
1:1~ D 307 34 Ill 1-3
~ ~ I
• 132 37 Noo ...01.]1
0 *"' ...... *"' ...0
FAILURE MODE, EFFECTS, AND CRITIC.t~~ . .:TY ANALYSIS WORKSHEET REV. A
SYSTEM: A2 ALSEP SUB-ASSY: Power Amplifier ATM 854 No. __________ __ Date: 15 June 70 ----------Mission
END ITEM: Data Transmitter DWG. NO.: 2344640 B Time: 8760 hrs. Engr. :__::C:...:•:...:S::...:·~----
Effects of Failure Probability
Part/ Component of occurrence FM Unreliabilit Symbol Failure Mode (FM) Q Sub-Assembly End-Item (aQ) x lO-s Rank
y
Rl Open (.05) Same as with Cl Short _!>o << 1 Watt • 037 41
R2 Open (. 05) Same as with C1 Open Po = 0 Watts • 037 41
R3 Open (. 05) Q1 Zin increases greatly Po - « 1 Watt . 037 41
R4 Open (. 05) Q1 Cut Off Po = 0 Watts . 037 41
R5 Open (. 05) Same as C4 Short Po « 1 Watt . 037 41 -
R6 Open(. 05) Q2 Zin increases greatly Po << 1 Watt . 037 41
R7 Open (.OS) Q2 Zin detuned Po <<. 1 Watt . 037 41 -
R8 Open(. OS) Same as with C6 Short Po -:~ 1 Watt -
R 9 (Deleted) . 037 41
RIO Open (. 05) Same as with C11 Short !'o Z< 1 Watt . 037 41
R11 Open(.05) Same as with C14 Open Po <<- l Watt • 037 41
Rl2 Open (.OS) Slight increase PA output _B, increases slightly . 037 41
R13 Open (.OS) No effect No effect • 061 41
C27 Open (. 70) Allows EMI conduction No effect • 123 betweenO/B/Mand PA "r:J>
Ill 1-3
Short (. 30) Lose all TM Data Lose TM Data . 053 ~ s:: w•
C28 Open (. 70) Allows EMI conduction No effect . 123 000
\J1
between 0/B/M and PA 0 ~ .......
Lose all TM Data Lose TM Data . 053 ~ Short (. 30) '-'>
FAILURE MODE, EFFECTS, AND CRITICA.w.~.fY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP SUB-ASSY: Power Amplifier
END ITEM: Data Transmitter DWG. NO.: 2344640 B
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
Part/ Component Symbol Failure Mode (FM) a Sub-Assembly End-Item
Q1 Open [CB/B/E] (. 25) Same as with Cl Open Po = 0 Watts
Short [CE/BE] (. 25) Same as with C2 Short Po = 0 Watts
Q2 Open [CB/B/E] (. 25) Same as Q1 Open Po = 0 Watts
Short [CE/BE] (. 25) Same as Q2 Short Po = 0 Watts
Q3 Open [CB/B/E] (. 25) Same as Q1 Open Po= 0 Watts
Short [CE/BE] (. 25) Same as Q1 Short Po = 0 Watts
Q4 Open [CB/B/E] (. 25) Same as Q1 Open Po = 0 Watts
Short [CE/BE] (. 25) Same as Q1 Short Po = 0 Watts
REV.
Date: 27 Jan 70
Engr.: C.S.
Probability of occurrence FM Unreliabilit (aQ) x 10- 5 Rank
y
8.540 10
8.540 10
8. 540 10
8. 540 10
8.540 10
8.540 10
8.540 10
8. 540 10
1:1> Ill ..,
~ ~ I
woo ...... Ul
0 IJ:>. ...., ,.j::.. ...0
FAILURE MODE, EFFECTS, AND CRITICAL.l.TY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
-----------------
Part/ Component Symbol Failure Mode (FM)
Ll Open (. 90)
Short (. 1 0)
L2 Open (. 90)
Short (. 1 0)
L3 Open (. 90)
Short(. 10)
L4 Open (. 90)
Short(. 10)
L5 Open (. 90)
Short (. 1 0)
L27 Open (. 90)
Short (. 1 0)
L28 Open (, 90)
Short(. 10)
L29 Open (. 90)
Short(. 10)
SUB-ASSY: Power Amplifier
DWG. NO.: 2344640 B
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
Q' Sub-Assembly End-Item
Same as with Cl Open Po = 0 Watts
Same as with C1 Short Po << 1 Watt
Q 1 Z in detuned .!:'o << 1 Watt
Same as C2 Short Po = 0 Watts
Same as C4 Short Po (< 1 Watt -
Q1 fails Short Po = 0 Watt
Same as with C1 Open Po = 0 Watts
Q4 Zin detuned Po << 1 Watt -
Same as with L4 Short Po /,< 1 Watt
Q2 Zin gets detuned and Po << 1 Watt practically shorted to ground
'I
l No effect ) Same as L16
I
iJ
REV. A
Date: 1 S June 70
Engr.: C .S. ------
Probability of occurrence FM Unreliabilit (a Q) x 10- 5
Rank y
7.884 12
. 876 28
7.884 12
. 876 28
15. 768 5
1. 752 25
7.884 12
. 876 28
7.884 12
. 876 28
15.768 5
l. 752 25
15.768 5 f"(j~
1.752 25 Ill ~
~ ~ 15. 768 5
I woo N\.11
l. 752 25 0 H::-..... H::-
"'
FAILURE MODE, EFFECTS, AND CRITICAL1TY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP SUB-ASSY: Power Amplifier
END ITEM: Data Transmitter DWG. NO.: 2344640 B
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
Part/ Component Symbol Failure Mode (FM) a Sub-Assembly End-Item
L6 Open (. 90) Same as with C6 Short Po << 1 Watt
Short (. 1 0) Q2 fails Short Po = 0 Watts
L7 Open(. 90) Same as C1 Open Po = 0 Watts
Short (. 1 0) Same as C6 Short Po << 1 Watt -L8 Open (. 90) Q2 -Q3 inter stage tuned Po « 1 Watt -
circuit gets detuned
Short(. 10) Same as Open Po « 1 Watt -
L9 Open (. 90) Same as with C1 Open Po = 0 Watts
Short (. 1 0) Q3 Zin gets detuned Po << 1 Watt
LlO (Deleted)
SB 1 thru 6 Cracked Bead No effect No effect
(encapsulated, minor performance effect)
SB 19 thru 25 Cracked Bead No effect No effect
(encapsulated, minor performance effect)
REV. A
Date: 15 June 70
Engr.: __ c_._s_··--------
Probability of occurrence FM Unreliabilit (a Q) x 10- 5
Rank y
15.768 5
1. 752 25
7.884 12
. 876 28
7.884 12
. 876 28
7.884 12
. 876 28
Nil
Nil
f-Q::r> IU 1-3 ~ ~
I woo VJ\]l
0 ~ .... >~'>-...0
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode ( FM)
Lll Open (. 90)
Short(. 10)
Ll2 Open (. 90)
Short (. 10)
L13 (Deleted)
L14 Open(. 90)
Short(. 10)
SUB-ASSY: Power Amplifier
DWG. NO. : 2344640 B
No. l'>TH 854 Mission Time: 8760 hrs.
Effects of Failure
0' Sub-Assembly End-Item
Q3 Zo gets detuned and Po « I Watt -looses Vee
Q3 collector becomes Po = o Watts grounded thru the Power Supply
Same as with C1 Open Po = 0 Watts
Q4 Zin becomes Po « 1 Watt de tuned
Q4 becomes open- Po =- 0 Watts circuited
Q4 becomes shorted to Po = 0 Watts ground
REV. A
Date: 15 Tune 70
Engr. :_ C.S.
Probability of occurrence FM Unreliabilit (aQ) x 10- 5
Rank y
15.768 5
1. 752 25
7.884 12
. 876 28
15.768 5
l. 752 25
t-cJ> PI t-3
~ ~ I
woo >J:>.(.]l
0 >J:>. ....... >J:>. -.!)
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
L15 Open(. 90)
Short (. 1 0)
L16 Open(. 90)
Short (. 1 0)
L17 Open (. 90)
Short (. 10)
Ll8 Open (. 90)
Short (. 1 0)
L19 Open (. 90)
Short(.lO)
L20 Open (. 90)
Short (. 1 0)
SUB-ASSY: Power Amplifier
DWG. NO.: 2344640 B
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
a Sub-Assembly End-Item
Same as with C1 Open Po = 0 Watts
Q4 Zo becomes detuned Po << 1 Watt
No effect; redundant No effect
Minor RF Interference No effect
Same as with L16 Open No effect
Same as with L16 Short No effect
Same as with L16 Open No effect
Same as with L16 Short No effect
Same as with L16 Open No effect
Same as with L16 Short No effect
Same as with L16 Open No effect
Same as with L16 Short No effect
REV.
Date: 27 Jan 70
Engr. :~c'-L.l:<s'-"-----
Probability of occurrence FM Unreliabili (a Q) x 10- 5
Rank ty
15.768 5
1.752 25
15. 768 5
1.752 25
15.768 5
1. 752 25
15.768 5
1. 752 25
15. 768 5
I. 752 25
15.768 5
1. 752 25
f-"CJ;J> PI t-3 ~ ~
I VJoo U"IU"J 0 ,j::. ...... ,j::. ...0
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
L21 Open (. 90)
Short(.10)
L22 Open (. 90)
Short(. 10)
L23 Open (. 90)
Short (. 1 0)
L24 Open (. 90)
Short(.lO)
L25 Open (. 90)
Short(. 10)
L26 Open(. 90)
Short (. 1 0)
L30 Open (. 90)
Short (. 10)
'
SUB-ASSY: Power Amplifier
DWG. NO.: 2344640 B
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
Q! Sub-Assembly End-Item
Same as with L16 Open No effect
Same as with L16 Short No effect
Same as with L16 Open No effect
Same as with L16 Short No effect
Same as with L16 Open No effect
Same as with L16 Short No effect
Same as with L16 Open No effect
Same as with L16 Short No effect
Same as with LI6 Open No effect
Same as with L16 Short No effect
Same as with LI6 Open No effect
Same as with L16 Short No effect
Same as with C12 Open Po<< 1 Watt -Slight detuning of Minor effect on Q2-Q3 interstage XMTR Po
REV. A
Date:15 June 70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (aQ) x 10-S Rank
y
15.768 5
1.752 25
15.768 5
l. 752 25
15.768 5
1. 752 25
15. 768 5
1. 752 25
15.768 5
1. 752 25
15. 768 5
1. 752 25
7.884 12 1:J>
. 876 12 Ill 1-3
~ ~ w• 0'8; 0 >1>-...... >1>---.o
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
FL1 Open (. 70)
Short (. 30)
FL2 Open (. 70)
Short (. 30)
FL3 Open (. 70)
Short (. 30)
FL4 Open (. 70)
Short (. 30)
FL5 Open (. 70)
Short (. 30)
FL6 Open (. 70)
Short (. 30)
SUB-ASSY: Power Amplifier
DWG. NO.: 2344640 B
Nof\TM 854
Mission Time: 8760 hrs.
Effects of Failure
Q Sub-Assembly End-Item
Q1 emitter becomes Po = 0 Watts open circuited
Q1 Zin becomes detuned Po << 1 Watt
Q1 collector discon- Po= 0 Watts nected from power supply
Shorted power supply Po= 0 Watts
Q2 Zin detuned Po <<:. 1 Watt -
Minor effect on Q2 Zin No effect
Q2 disconnected from Po::= 0 Watts power supply
Shorted power supply Po = 0 Watts
Q3 disconnected from Po::: 0 Watts power supply
Shorted power supply Po = 0 Watts
Q4 disconnected from Po ::: 0 Watts power supply
Shorted power supply Po = 0 Watts
REV.
Date: 27 Jan 70
Engr.: C.S. -
Probability of occurrence FM Unreliabilit (aO) x 10- 5 Rank
y
1. 770 24
. 759 30
l. 770 24
. 759 30
l. 770 24
• 759 30
1. 770 24
. 759 30
1. 770 24
. 759 30 "d:;t> PI t-3
1. 770 24 ~ ~ w' -.J3; 0 """ . 759 30 ....,
""" --o
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
FL7 Open (. 70)
Short (. 30)
FL8 Open (. 70)
Short (. 30)
FL9 Open (. 70)
Short (. 30)
FLIO Open (. 70)
Short (.30)
SUB-ASSY: Power Amplifier
DWG. NO.: 2344640 B
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
Q' Sub-Assembly End-Item
XMTR Preamplifier Po = 0 Watts disconnected from powe1 supply
Shorted Power Supply Po = 0 Watts
XMTR Modulator dis- Po = 0 Watts connected from power supply
Shorted Power Supply Po = 0 Watts
XMTR Oscillator dis- Po = 0 Watts connected from power supply
Shorted power supply Po = 0 Watts
Power Amplifier Po = 0 Watts disconnected from power supply
Shorted Power Supply Po = 0 Watts
REV.
Date: 27 Jan 70
Eng r . :___::C:;..:•;..:s:;..:.:.__ __ _
Probability of occurrence FM Unreliabilit (aQ) x 10- 5
Rank y
I. 770 24
. 759 30
I. 770 24
. 759 30
I. 770 24
. 759 30
I. 770 24
. 759 30
'"c:J> Ill 1-3 ~ ~ w' oo8; 0 *" ......
*" -.o
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component
SUB-ASSY: X6 Multiplier
DWG. NO.: 2344610 B
No. ATM 854
Mission Time: 8760 hrs.
Effects of Failure
Symbol Failure Mode (FM) £l' Sub-Assembly End-Item
Cl Open {o 70} X6 multiplier presents Near total loss of major impedance mis- XMTR power output match to power amplifier (£>o < < 1 watt)
Short (. 30) Circuit signal path is Total loss of XMTR shorted power output
(Po = 0 watts)
C2 Open {o 70} Same as with C 1 open £>o << 1 watt)
Short (. 30) Same as with Cl short Po = 0 watts
C3 Open (. 70) Same as with Cl open Po<< 1 watt
Short (. 30) Same as with Cl short Po = 0 watts
C4 Open (. 70) Power amplifier Zo is £>a<< 1 watt greatly mismatched
Short (. 30) Same as with C 1 short Po = 0 watts
C5 Open (. 70) Same as with C4 open Po << 1 watt
Short (. 30) Same as with Cl short Po = 0 watts
C6 Open (. 70) Same as with C4 open Po << 1 watt -
Short (. 30) Same as with C 1 short Po = 0 watts
REV.
Date: 22 Jan 70
Engr.: C.S.
Probability of occurrence FM Unreliabili (a Q) x 10- 5 Rank
ty
• 920 26
• 395 32
. 920 26
. 395 32
. 920 26
. 395 32
• 920 26
. 395 32
• 920 26
. 395 32
.920 26 "d::t> IU 1-j
. 395 32 ~ ~ w' 00 -.D\Jl 0 ,j:>. ..... ..,.. -..{)
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP SUB-ASSY: X6 Multiplier
END ITEM: Data Transmitter - ------ --------------- DWG. NO.: 2344610 B -
No. ATM 854
Mission Time: 8760 hrs. - ----- - - . - - --
Effects of Failure
Part/ Component Symbol Failure Mode (FM) a Sub-Assembly End-Item
C7 Open (. 70) Same as with C4 open Po<< l watt -
Short (. 30) Same as with C l short Po = 0 watts
CRl Open (. 10) Same as with Cl open Po<< l watt
Short (. 30) Same as with Cl short Po = 0 watts Drift (. 60) Cavity frequency slightly Slight change in Po
changed
CR2 Open (. l 0) Same as with C4 open Po<< l watt -Short (. 30) Same as with C 1 short Po = 0 watts
Drift (. 60) Same as with CRl - drift Slight change in Po
R1 Open (. 0 5) Renders Bias Varactor Po<< l Watt -Network No. 1 ineffective
R2 Open (. 05) Renders Bias Varactor _!>o < < 1 Watt 1
Network No. 2 ineffective Loss of TM power data
FLl Open (. 70\ Same as Rl open Po<< 1 Watt -
Short (. 30) Same as open mode Po<< 1 Watt
FL2 Open (. 70) Same as RZ open Po<< 1 Watt; Loss of TM power data
Short (. 30) Same as open ~o< < 1 Watt; L,oss of TNt power data
REV.
Date: 22 Jan 70
Engr 0 --
Probability of occurrence (aQ) x 10- 5
0 920
• 395
4.380 13. 140 26.280
4.380 13. 140 26.280
.037
.037
. 890
. 379
. 890
. 379
c.s
FM Unreliabilit y
Rank
26
32
17 6 2
17 6 2
41
41
27
33
27
33
'd Pl
(JQ
CD
*"' 0 0 .....,
*"' "'
;t> t-j
~ 00 \}1
*"'
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter - ~
SUB-ASSY: X6 Multipler
DWG. NO.: 2344610 B
No. ATM 854 Mission Time: 9760 hrs.
Effects of Failure
Part/ Component Symbol Failure Mode (FM) Q' Sub-Assembly End-Item
RVl (NTK #1) Open (. 05) Same as with R1 open Po<< l Watt
Drift (. 95) No effect No effect
RV2 (NTK #l) Open (. 05) Same as with R 1 open Po<< 1 Watt -
Drift (. 95) No effect No effect
RV3(NTK #1) Open (. 0 5) Same as with R 1 open Po < < 1 Watt -
Drift (. 95) No effect No effect
RV4 (NTK#2) Open (. 05) Same as with R2 open i_>o < < 1 Watt;
Loss of TM power data
Drift (. 95' No effect No effect
RV5 (NTK#2) Open (. 05) Same as with R2 open i_>o< < 1 Watt; Loss of TM power data
Drift (. 95) No effect No effect
R2 (NTK #1) Open ( 0 9 5) Same as with R1 Open Po<< 1 Watt -
REV.
Date: 22 Jan 70 -------~
Engr c. s.
Probability of occurrence FM Unreliabili (aQ) x 10- 5 Rank
ty
. 657 31
12.483 7
• 657 31
12. 483 7
• 657 31
12.483 7
• 657 31
12.483 7
• 657 31
12.483 7
8. 114 11
1:/:X:. I» 1-j
~ ~ ~· 00 ,_.\.11
0 ~ ..... ~ -D
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP SUB-ASSY: X6 Multiplier
END ITEM: Data Transmitter DWG. NO.: 2344610 B
No. ATM 854
Mission Time: 8760 hrs.
Effects of Failure Part/ Component
Symbol
R4 (NTK #2)
R6 (NTK #2)
RS
Failure Mode (FM) Q'
Open (. 95)
Open (. 9 5)
Open (. 95)
Sub-Assembly
Same as with R2 open
Same as with R2 open
Bias Varactor #2 gets totally erroneous bias
End-Item
Po<< 1 Watt· - l
Loss of TM power data
Po<< 1 Watt, - I Loss of TM power data
fo < < 1 Watt •, TM power data becomes completely erroneous
REV.
Date: 22 Jan 70
Engr.: C. S.
Probability of occurrence (aQ) x 10-S
8. 114
8. 114
8. 114
FM Unreliability Rank
11
11
11
1:1:> Ill t-j
~ ~ ""'~ N\.11 0 ~ ...... ~ '-D
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
Rl Open
R2 Open
R3 Open
R4 Open
R5 Open
R6 Open
R7 Open
R8 Open
RIO Open
SUB-ASSY: Current Temp. & RF Power Telmy.
DWG. NO.: 2344664C
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
0' Sub-Assembly End-Item
(. 95) ARl saturates; Total loss of RF Power TM Data
(. 95) AR I does not function as Total loss of Po a comparator; Eo = TM Data
. 55 vdc
(. 95) Same as with R2 open Total loss of Po TM Data
(. 05) ARLlooses bias voltages Total loss of Po Eo = 0 volts TM Data
(. 95) AR 1 is cut off as re- Total loss of Po gards power signals TM Data
(. 95) AR 1 can not sense Total loss of Po Power Signals TM Data
(. 95) RF Signal Path is open Total loss of Po TM Data
(. 9 5) AR 1 saturates Total loss of Po TM Data
(. 95) Power output level Total loss of Po sensor is lost TM Data
REV.
Date: 1-29-70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (aQ) x 10- 5
y
16.228 4
16.228 4
16.228 4
. 073 40
16.228 4
16.228 4
16.228 4
16.228 4
16.228 4
Rank
1:J Ill
(JQ (1)
,j::.. w 0 .... >+>--.!)
:;c. ~
~ 00 \.11 >+>-
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
Rll Open
R12 Open
R13 Open
Rl4 Open
RlS Open
Rl6 Open
Rl7 Open
SUB-ASSY: Current Temp. & RF Power Tlmy
DWG. NO.: 2344664C
No.ATM 854 Mission Time: 8760 hrs.
Effects of Failure
a Sub-Assembly End-Item
( l. 0) No effect Xmtr ground po-tential is . 8 vdc above TM ground instead of . 4 vdc; no effect
( l. 0) No effect Same as with R 11 open
(. 95) AR2 is saturated Total loss of Current TM Data
(. 95) AR2 does not function as Total loss of Currer a comparator TM Data
(. 05) AR2 looses bias voltages Total loss of Cur-Eo; 0 volts rent TM Data
(. 95) AR2 can not sense cur- Total loss of Cur-rent signals rent TM data
(. 95) AR2 saturates Total loss of Cur-rent TM data
REV.
Date: 1-29-70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (aQ)xlO-S Rank
y
6.256 13
6.256 13
16.228 4
tl6. 228 4
. 073 40
16.228 4
16.228 4
1J> Ill 1-3
~ ~ ~· ~~ 0 ~
"'"" ~ -.!)
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
Rl8 Open
Rl9 Open
R21 Open
R22 Open
R23 Open
R24 Open
R25 Open
Fl Open
SB 7 thru 18 Bead Cracks
SUB-ASSY: Current Temp. & RF Power Tlmy.
DWG. NO.: 2344664C
No. ATM 854 Mission Time: R7h0 hr1'1 ........................ - ......
Effects of Failure
Q' Sub-Assembly End-Item
(. 95) AR2 saturates Total loss of Cur-rent TM Data
(. 95) AR2 saturates Total loss of Cur-rent TM Data
(. 95) AR2 Signal output level Total loss of Cur-sensor is lost rent TM Data
(. 95) Temp. #2 level sensor Total loss of Temp is lost #2 TM Data
(. 95) Temp. #2 sensor is Total loss of Temp inoperative (open path) #2 TM Data
(. 95) Temp. # 1 TM Sensor is Total loss of Temp inoperative (open path) #1 TM Data
(. 95) Temp. # 1 level sensor Total loss of Temp is lost #1 TM Data
( l. 00) Lose all telemetry power Total loss of all TM Data
No effect No effect (Beads are encap-sulated and still functional)
REV. A
Date: 15 June 70 _c_..:..___
Engr.: r c:: -
Probability of occurrence FM Unreliabilit y (aO) x 10- 5 Rank
16.228 4
16.228 4
16.228 4
16.228 4
16.228 4
16.228 4
16.228 4
87.60 lA
Nil 1:J PI
(JQ (!)
~ U1
0 ...... ~ -.£)
> t-3 ~ 00 U1 ~
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Failure Mode (FJ) Symbol
CRI Open
Short
CR2 Open
Short
CR3 Open
Short
CR4 Open
Short
SUB-ASSY: Current, Temp. & RF Power Tlmy.
DWG. NO.: 2344664C
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
a Sub-Assembly End-Item
(. 10) AR 1 saturates Total loss of Po TM data
(. 3 0) ARl cut off Total loss of Po TM data
(. 10) No effect No effect
(. 30) ARl Eo is grounded Total loss of Po TM data
(. l 0) AR2 saturates Total loss of Curr-ent TM data
(. 30) AR2 Cut off Total loss of Cur-rent TM Data
(. 10) Current output signal Total loss of Cur-path is open rent TM data
(. 30) No significant effect No significant effect
REV.
Date: 1-29-70
Engr.: C. S.
Probability of occurrence FM Unreliabili (aO)xl0- 5
Rank ty
5.633 14
16.899 3
5.633 14
16. 899 3
5.633 14
16.899 3
1. 849 22
5.547 15
f-cJ> Ill t-3
~ ~ >~:>.b:, 0"\Jl 0 >~:>. ...... >~:>.
"'
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
CRS Open
Short
CR6 Open
Short
CR7 Open
Short
ARl Open
Short
Drift
SUB-ASSY: Current, Temp. & RF Power Tlmy
DWG. NO.: 2344664C
No. ATM 854 Mission Time: 8760 hrs.
Effects of Failure
a Sub-Assembly End-Item
(. 10) No effect No effect
(. 3 0) Current signal output Total loss of Cur-is shorted rent TM data
(. 10) No effect No effect
(. 3 0) Temp #2 TM data are Total loss of shorted to ground Temp #2 TM data
(. 10) No effect No effect
(. 30) Temp #1 TM data are Total loss of Temp shorted to ground #1 TM data
(. 50) Loss of Po TM functions Total loss of Po TM data
(. 30) Same effect as open Total loss of Po TM data
(. 20) Minor loss in circuit Minor loss in Po sensitivity TM data accuracy
REV.
Date: l-29-70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (aQ) x 10-S Rank
y
5.633 14
16. 899 3
5.633 14
16.899 3
5.633 14
16.899 3
5.256 16
3.454 19
2. 102 21
1:J;t> PI 1-j
~ ~ ..j::.l --.)00
U1 0 ..j::. ...... ..j::.
"'
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (MF)
AR2 Open
Short
Drift
RTl (Deleted)
SUB-ASSY: Current, Temp. & RF Power Tlmy
DWG. NO.: 2344664C
No. ATM-854
Mission Time: 8760 hrs.
Effects of Failure
a Sub-Assembly End-Item
(.50 Loss of Current TM Total loss of functions current TM data
(. 30) Same as open Total loss of current TM data
(. 20) Minor loss in circuit Minor loss in
sensitivity current TM data accuracy
REV. A
Date: 6/15/70
Engr.: C. S.
Probability of occurrence FM Unreliabilit (aO)xlO-S Rank
y
5.256 16
3.454 19
2. 102 21
11> Ill 1-3
a;; ~ ,j::..l
00~ 0 ,j::.. ......
""" -.o
FAILURE MODE, EFFECTS, AND CRITICALITY ANALYSIS WORKSHEET
SYSTEM: A2 ALSEP
END ITEM: Data Transmitter
Part/ Component Symbol Failure Mode (FM)
RT1 (Deleted)
RT2 Open
Short
Drift
SUB-ASSY: Current, Temp. & RF Power Tlmy
No. ATM 854 Mission
DWG. NO.: 2344664C Time: 8760 hrs.
Effects of Failure
Q Sub-Assembly End-Item
(.50) Same as R24 open Total loss of Temp. #1 TM Data
(. 25) Same as open Total loss of Temp. #1 TM Data
(. 25) No effect No effect
REV. A
6/15/70 Date: __ ....:._ ___ _
Engr.: C. S.
Probability of occurrence FM Unreliabilit (a0)x10-S Rank
y
13. 140 6
6.470 12A
6.570 l2A
1:l:X:. Ill t-3 ~ ~ ~· ...000
\Jl 0 ~ 1-+,
~ --0