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ROSAS Safety Days10./11.10.2017
Safety and Reliabilityin Civil Aviation
AF Aviation ConsultingAxel FirschingKirschsteig 514552 Michendorf/GermanyTel: +49 (0) 171 611 33 61E-Mail: axel.firsching@web.de
2AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
Table of Contents
1. About Me
2. Some Basics
3. A Few Accident Photos
4. Safety Regulations
5. Safety Predictions
6. ETOPS/EDTO
7. Safety at the Edge - Hechi Airport (China)
8. Air Traffic in Africa
9. How We Do Not Want To Work In The Future (Film)
10. Discussion
3AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
Axel Firsching, 59 years, married, two children
Diploma in Mechanical and Aerospace Engineering from the Technical University of Munich
In Aerospace Engineering since 33 years - Turbo Engines and their installations
Specialist for Airworthiness and Aviation Safety since 30 years
Founded in April 2017
International relations to all major aviation companies and the Certification Authorities
Trainer for various aviation fields
Good network into all industry associations (ASD, AIA, GAMA, AIAC, AIAB, BDLI, etc.)
1. About Me
4AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
2. Some Basics
ICAO Annex 8 - Conversion into EU Legislation
(Part-21) (Part-M + Part-145 + Part-66 + Part-147)
5AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
3. A Few Accident Photos (I)
6AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
Gulfstream GIV, Hanscom AFB, Bedford MA, USA - 31 May 2014
TO attempt with 7 aboard
No rotation at V1, but further attempts to lift off
TO aborted too late - A/C overran runway
A/C lost undercarriage when hitting an antenna installation
Fuel tanks penetrated and A/C caught fire - no survivors
Both pilots extremely experienced (PIC 11.250 hrs, SIC 18.500+ hrs)
Accident caused by an engaged gust pitch lock (A/C parking system), preventing rotation at any speed
Most probably pilots did not execute pre-flight check list
HUMAN ERROR!
3. A Few Accident Photos (II)
7AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
3. A Few Accident Photos (III)
8AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
Airbus A320-214, in-flight from La Guardia Airport NY, USA - 15 January 2009
5 crew, 150 pax
Total loss of thrust in both engines after massive bird flock encounter
Not enough altitude to reach any of the NY airports
Decision taken to ditch into the Hudson river
A/C stayed intact and swimming
Only minor injuries
Accident investigation concluded multiple bird ingestion into both engines well above certification requirements both in bird number and weight
BAD LUCK!
3. A Few Accident Photos (IV)
9AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
3. A Few Accident Photos (V)
10AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
Gulfstream G650 Flight Test, Roswell NM, USA - 02 April 2011
Flight test programme to simulate engine failure on TO with 4 aboard
After various successful TO’s on last attempt A/C right wing struck the ground and A/C burst in flames killing all 4 crew
Accident investigation concluded a number of contributors to the accident:
Wrong estimation of critical AOA in ground effect, hence wrong setting of stick shakers - pilots did not recognize problem before it was too late
Too aggressive test planning - issue had been seen before, but not been properly investigated and avionics adjusted
Full fuel aboard instead of water ballast to simulate max. TO weight
HUMAN ERROR!
3. A Few Accident Photos (VI)
11AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
3. A Few Accident Photos (VII)
12AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
Boeing 777-236ER, London Heathrow, UK - 17 January 2008
16 crew, 136 pax
No throttle response in both engines and uncommanded roll-back on final approach
A/C landed short of runway - only minor injuries to crew and pax
Accident investigation concluded that ice in the fuel system had blocked the fuel-oil heat exchangers leading to fuel starvation
Issue had been seen on previous single engine events on other aircraft but never been understood and resolved
New phenomenon affecting all aircraft in the world
Major redesign on ALL RR engines introduced!
3. A Few Accident Photos (VIII)
13AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
4. Safety Regulations (I)
Risk Assessment Risk Management
Estimation of the Failure Rate for the
service event
Root Cause Analysis Reliability Prediction
(Weibull Analyis),Time dependency?
Service Data
Risk Estimation of the Failure
Effect(Cat or Haz)
FTA (Multiple Failures) FMECA (Single Failures) Event Tree Analysis, if
possible eventsequences with differentcategories
Calculation of the Reaction
Time
EASA AMC & GM for Part21 Subpart A
FAA ContinuedAirworthinessAssessment AC39-8
P < 10-9 (Cat)P < 10-8 (Haz)
No
Acceptable Risk
Yes
Overview of the Risk Assessment/ Management Methodology
14AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
4. Safety Regulations (II)
Acceptable Regulatory Risk (I)
Dual Engine Event = potentially Catastrophic (Cat)
The requirements are: Risk must be < 1.0E-9 per Aircraft Flight Hour (AFH)
If this is not met, a corrective action is required such that:
No aircraft must carry an occurrence rate greater than 2E-06 per AFH
The fleet mean cumulative risk of an event over the period of the campaign must not exceed 1.5E-04.
The predicted number of events over the period of the campaign must not exceed 0.1.
The worst counts.
15AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
4. Safety Regulations (III)
Acceptable Regulatory Risk (II)
Single Engine Event = potentially Hazardous (Haz)
The requirements are: Risk must be < 1.0E-8 per Aircraft Flight Hour (AFH)
If this is not met, a corrective action is required such that:
No aircraft must carry an occurrence rate greater than 2E-05 per AFH
The fleet mean cumulative risk of an event over the period of the campaign must not exceed 1.5E-03.
The predicted number of events over the period of the campaign must not exceed 0.5.
The worst counts.
16AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
4. Safety Regulations (IV)
Acceptable Company Risk
BUT THERE IS SOMETHING ELSE - Company Policies (typical example):
Dual Engine Event = potentially Catastrophic (Cat) As before - A/C manufacturer needs to decide on his acceptability level
Single Engine Event = potentially Hazardous (Haz) The fleet mean cumulative risk of an event over the period of the
campaign must not exceed 1.0E-03.
The predicted number of events over the period of the campaign must not exceed 0.2.
In both cases: Reaction Time cap 10 calendar years!
17AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
5. Safety Predictions (I)
Flyforward Modelling (I)
2883 cycles7587 hours
4699 cycles12181 hours
3225 cycles8305.2 hours
5041 cycles12899.2 hours
3.8 cycles per day
2.1 hours per cycle
NOW +3 MONTHS
Future age of the engine can be estimated using: Operator utilisation (average cycles per day)
Operator stage length (average hours per flight)
From the future age we can calculate: Hazard rate in 3 months time
Probability of failing in the next 3 months
18AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
5. Safety Predictions (II)
Flyforward Modelling (II)
This can be repeated for the whole fleet to calculate Average hazard Max hazard Expected number of failures
……
……
Now +3 MONTHS
19AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
5. Safety Predictions (III)
Flyforward Modelling (III)
A. Firsching/Dr. C. Ludena – Rolls-Royce Deutschland 20.06.2013
Repeat for 6 months, 9 months, …
NOW +3 MONTHS
……
……
……
……
……
……
+6 MONTHS FUTURE
20AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
5. Safety Predictions (IV)
Flyforward Example (I)
0.0E+00
2.0E-04
4.0E-04
6.0E-04
8.0E-04
1.0E-03
1.2E-03
1.4E-03
1.6E-03
1.8E-03
2.0E-03
1-Jan-04 31-Dec-04 31-Dec-05 31-Dec-06
Date
Accu
red
risk
(per
eng
ine)
Reaction Time?
September 20183.0E-04
6.0E-04
9.0E-04
1.2E-03
1.5E-03
1.8E-03
2.1E-03
2.4E-03
2.7E-03
3.0E-03
0.0E-00
01 Jan 2016 31 Dec 2016 31 Dec 2017 31 Dec 2018
21AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
5. Safety Predictions (V)
Flyforward Example (II)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1-Jan-04 31-Dec-04 31-Dec-05 31-Dec-06
Date
No
of F
ailu
res
1.5 Failures !!!
May 2017
Reaction Time
November 2017
01 Jan 2016 31 Dec 2016 31 Dec 2017 31 Dec 2018
22AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
5. Safety Predictions (VI)
Fleet Example (I)
DIFSD Rate
1,E-13
1,E-12
1,E-11
1,E-10
1,E-09
1,E-08
1,E-07
1,E-06
1,E-05
30. Apr 10 31. Mai 10 01. Jul 10 01. Aug 10 01. Sep 10 02. Okt 10 02. Nov 10 03. Dez 10 03. Jan 11 03. Feb 11Calendar Time
DIF
SD R
ate
Mean DIFSD Rate Max DIFSD Rate
Certification Requirement 1E-09/AFH
Ultimate Limit for Grounding 2E-06/AFH
23AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
5. Safety Predictions (VI)
Fleet Example (II)
Single Events Prediction
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
3-Dez
-082-J
an-09
1-Feb
-093-M
rz-09
2-Apr-
092-M
ai-09
1-Jun
-09
1-Jul-
0931
-Jul-0
930
-Aug
-0929
-Sep
-0929
-Okt-
0928
-Nov
-0928
-Dez
-0927
-Jan-1
026
-Feb-10
28-M
rz-10
27-A
pr-10
27-M
ai-10
26-Ju
n-10
Calendar Time
Even
ts
24AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
ETOPS = Extended Twin-Engine Operations
Joke: ETOPS = "Engines Turn or Passengers Swim"
EDTO = Extended Diversion Times Operations (official ICAO language since 2012)
ETOPS for twin-engine A/C only
EDTO for all aircraft
ETOPS/EDTO = maximum permitted diversion time from next landing point in case of an engine failure
"Normal" permitted diversion time 90 min (EASA all A/C) respectively 60 min (FAA twins) and 180 min (FAA multi-engine)
Current maximum certified diversion time 370 min (A350 XWB)
6. ETOPS/EDTO (I)
25AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
8. ETOPS/EDTO (II)
370
26AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
ETOPS/EDTO is a system certification, i.e.
Engines, APUs and A/C need to meet certain reliability levels, which requires frequent installation of redundancies - partially demonstrated by design ("EDTO out of the box") and partially by proven actual reliability
Sufficient fuel reserves to allow for extended operation at OEI
Pilot and ground crew training for appropriate flight planning including wind and weather considerations
Maintenance crew procedures and training to reduce human error
Suitability of assumed diversion airports
Demonstration and reporting of actual reliability
May be withdrawn on airline level if required reliability figures cannot be demonstrated anymore
Boeing dream of closing the south polar gap and any wind/weather dependencies => EDTO 540 min!!!
6. ETOPS/EDTO (III)
27AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
6. ETOPS/EDTO (IV)
- Spitsbergen
28AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
6. ETOPS/EDTO (V)
HRD = High Rate Discharge LRD = Low Rate Discharge
Boeing 787 Cargo Fire Suppression
29AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
7.Safety at the Edge - HechiAirport (China)
30AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
8.Air Traffic in Africa
31AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
9.How We Do Not Want To Work In The Future (Film)
32AF Aviation Consulting, Axel Firsching, Kirschsteig 5, 14552 Michendorf, Germany, Tel: +49 (0) 171 611 33 61, E-Mail: axel.firsching@web.de
Thank you!
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