Horizontal Situation Indicator

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TERMINAL LEARNING OBJECTIVE:ACTION TEXT: Identify the major components, features,

functions, and operational characteristics of the Horizontal Situation Indicator (HSI)(KI-525A).

CONDITION: In a Classroom, given visual representations of the HSI (KI-525A) components and applicable references.

STANDARD: Answer questions pertaining to the major components, features, functions and operational characteristics of the Horizontal Situation Indicator (HSI) (KI-525A).

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ENABLING LEARNING OBJECTIVE A

ACTION: Identify the features and functions of an HSI

CONDITIONS:

Label the features/function on a diagram of an HSI

STANDARDS:

IAW FM 3-04.240, TH-67 Operators Supplement

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KCS-55A system

Supporting:

1. King/Bendix: KI 525A (HSI)

2. King/Bendix: KNI 582 (RMI)

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Magnetic Slaving TransmitterDirectional Gyro

KA-51B Slaving Control

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Aeronautical Information ManualExplanation of Changes

(Change 1) Effective: 26 Jul 12

This change explains why slaved compass systems may be susceptible to heading errors on the ground and alerts pilots to the fact that the system’s erroneous heading may not self-correct. It also offers mitigation strategies to avoid a possible heading misalignment at takeoff.

Para 1−1−7 d

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d. Aircraft equipped with slaved compass systemsmay be susceptible to heading errors caused byexposure to magnetic field disturbances (flux fields)found in materials that are commonly located on thesurface or buried under taxiways and ramps. Thesematerials generate a magnetic flux field that can besensed by the aircraft’s compass system flux detectoror “gate”, which can cause the aircraft’s system toalign with the material’s magnetic field rather thanthe earth’s natural magnetic field. The system’serroneous heading may not self-correct. Prior to takeoff pilots should be aware that a headingmisalignment may have occurred during taxi. Pilotsare encouraged to follow the manufacturer’s or otherappropriate procedures to correct possible headingmisalignment before take off is commenced.

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Compass Card

Lubber Line

Symbolic Aircraft

Selected Course Pointer

Course Select Knob

VOR or RNAV (GPS) or LOC Deviation Bar

Deviation Scale

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Heading Select Knob

To/From Indicator

Dual Glideslope Chartreuse Pointers

Glideslope Deviation Scale

Heading Select Bug

(NOT used in LOC or ILS modes)

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ENABLING LEARNING OBJECTIVE B

ACTION: Identify abnormal circumstances

CONDITIONS: Given HSI indications

STANDARDS: IAW TH-67 Operator’s Supplement

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GLIDESLOPE POINTERS NOT VISIBLE DURING ILS

Abnormal Indications

NAV HDG

WARNING FLAG (NAV)

WARNING FLAG (HDG)

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ENABLING LEARNING OBJECTIVE C

ACTION: Conduct operational accuracy checks

CONDITIONS: Given HSI indications

STANDARDS: IAW FM 3-04.240, DOD FLIP (GP, AP/1, IFR-S), AIM

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FAA A/FD SE

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VHF Omnidirectional Test Signal (VOT)

Tolerance +4

Transmits only the 360o Radial.

Generally on 108.0 MHz

Correct indication - FROM with 360 course selected

Excessive error 5 deg right

Ref: 14 CFR 91.171(b)1

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VOR Ground Checkpoint

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Tolerance +4. Ground Checkpoints are not published in DOD FLIP but are published on Airport Diagrams and in the FAA Airport/Facility Directory.

066oR

OZR111.2066R

VOL 14 Page: 80

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7.4 NM2000 MSL

R - 314

1. Published in DOD FLIP AP/12. Tolerance ± 6º

1. Center both HSI deviation bars.2. Tolerance: Selected course

Pointers must be within 4o of each other.

Ref: FM 3-04.240 Para 7-41 AIM Para 1-1-4 19

DUAL VOR RECEIVER CHECKNav 1 (Garmin 430W) and Nav 2 (KX-165)

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ENABLING LEARNING OBJECTIVE D

ACTION: Determine aircraft’s position in relation to a VOR

CONDITIONS: Given HSI indications

STANDARDS: IAW FM 3-04.240, TH-67 operators supplement

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TO/FROM Indicator

Selected COURSE

RADIAL - read opposite TO/FROM indicator

180° radial 4° LEFT. The aircraft is on the 176° radial

Cardinal directions

Radials either side of current position

Rotate Selected Course Pointer until deviation bar centers.

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Will selected course take you toward or away from station?

What is your position (radial)?

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Will selected course take you toward or away from station?

What is your position (radial)?

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ENABLING LEARNING OBJECTIVE E

ACTION: Intercept a specific course

CONDITIONS: Given a specific course and HSI indications

STANDARDS: IAW FM 3-04.240

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1. Locate radial to be intercepted (190).

2. Convert to course.

3. Rotate course selector knob until point of course selector shows new course (010°).

4. Turn TOWARD the course deviation indicator until course selector is at the 45° index.

5. As deviation bar centers, turn to new course.

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1. Locate radial to be intercepted (210).

2. Convert to course.

3. Rotate course selector knob until point of course selector points to new course (030°).

4. Turn TOWARD course deviation indicator until course selector is at the 90° index.

5. As deviation bar centers, turn to new course.

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1. Locate radial / course to be intercepted (025°).

2. Rotate course selector knob until point of course selector shows new course (025°).

3. Turn TOWARD course deviation indicator until course selector is at the 45° index.

4. As deviation bar centers, turn to new course.

Intercept the 025 degree Radial Outbound

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OZR 111.20

EUF 109.20

R-229

R-249

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Determine your position relative to PETRY

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Determine your position relative to SHADY

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NAV

STATION PASSAGE

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ENABLING LEARNING OBJECTIVE F

ACTION: Track a specific Magnetic Course

CONDITIONS: Given a course and HSI indications

STANDARDS: IAW FM 3-04.240

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Tracking the MGM 126 radial inbound (Airspeed 100 knots)

INITIAL CORRECTION

1st TRIAL CORRECTION

1st TRIAL CORRECTION

TOO SMALLREPEAT

INITIAL CORRECTION

2nd TRIAL CORRECTION

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Tracking the MGM 126 radial inbound (Airspeed 100 knots)

INITIAL CORRECTION

1st TRIAL CORRECTION

1st TRIAL CORRECTION

TOO LARGE

TURN PARALLEL TO COURSE

2nd TRIAL CORRECTION

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ENABLING LEARNING OBJECTIVE G

ACTION: HSI deviation scale. Define the scale for the navigational aid you are using.

CONDITIONS: Given a course and HSI indications

STANDARDS: IAW FM 3-04.240, AIMS

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1. LOC (Localizer) = + 2 ½ degrees

2. VOR = + 10 degrees

3. GPS = a. Enroute = + 5 Nm*b.Terminal Area = + 1 Nmc. Approach = + 0.3 Nm

- 2 1/2o -10o +5 Nm+ 1 Nm+ 0.3 Nm

HSI Deviation Scale

+ 2 1/2o - 0.3 Nm-1 Nm- 5 Nm + 10o

* Flight line IP’s usually select 2 Nm; however this is for RNP (Required Navigation Performance) certification which the A/C is NOT certified for.

As of: Oct 20136 IFR TH-67’s are equipped with the KI-825. Installations

are being completed when aircraft are in phased maintenance. (This is NOT progressing quickly as from Jan 2013 – Oct 2013 only one KI-825 was installed)

Simulators will be updated when 50% of our fleet has KI-825’s installed. (Circa year 2033)

Our Fleet: 65 IFR TH-67’s

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Bendix-King KI-825Electronic Horizontal Situation Indicator (EHSI)

For more info: http://www.seaerospace.com/king/kinggra/ki825pg.pdf

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Questions?

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BREAKTIME