ASN Wikibase Occurrence # 279292
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| Date: | Friday 6 August 2021 |
| Time: | 09:35 UTC |
| Type: |  Airbus A319-131 |
| Owner/operator: | British Airways |
| Registration: | G-DBCF |
| MSN: | 2466 |
| Year of manufacture: | 2005 |
| Engine model: | International Aero Engine V2522-A5 |
| Fatalities: | Fatalities: 0 / Occupants: 106 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | South of Edinburgh Airport, Turnhouse, Edinburgh, Lothian -
 United Kingdom
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Edinburgh-Turnhouse Airport (EDI/EGPH) |
| London-Heathrow Airport (LHR/EGLL) | |
| Investigating agency: | AAIB |
| Confidence Rating: |  Accident investigation report completed and information captured |
British Airways flight BA1441, a Airbus A319-131 had taken off from Edinburgh Airport when the autopilot and autothrust disconnected. After several minutes the flight crew were able to re-engage them but they disconnected again during the approach. The aircraft landed safely.
The autopilot and autothrust disconnects were caused by severe drift of the aircraft’s Inertial Reference System due to vertical shock loads transferred into the system during the takeoff roll. The source of the shock loading was an uneven repair patch on the runway. The nose landing gear shock absorber was found to be over extended, leading to transfer of vertical shock forces into the airframe.
AAIB Conclusion
The aircraft experienced severe navigation position drift in flight. The drift was caused by abnormal vertical shock loads being transferred through the overextended NLG shock absorber to the ADIRU. The abnormal shock loads were initiated by an uneven patch repair on the runway. The NGC ADIRU is particularly sensitive to sudden vertical shock loading outside its environmental qualification envelope.
Accident investigation:
 |
|
Sources:
1. AAIB Final Report: https://assets.publishing.service.gov.uk/media/629f518c8fa8f5039a1bd719/Airbus_A319-131_G-DBCF_07-22.pdf
2. https://www.aeroinside.com/16060/british-airways-a319-near-london-on-aug-6th-2021-avionics-issues
3. Flight Global 16 June 2022: https://www.flightglobal.com/safety/jolt-from-runway-patch-upset-ba-a319s-inertial-reference-system/149027.article
4. https://avherald.com/h?article=4ec4f3fa&opt=0
5. https://oneworldvirtual.org/fleet/aircraft/G-DBCF
6. https://www.planemapper.com/aircrafts/G-DBCF
Media:
Airbus A319-131 G-DBCF of British Airways at Schipol, Amsterdam, 3 January 2022:During a flight from Edinburgh Airport to London Heathrow an Airbus A319-131 (G-DBCF), experienced severe navigation position drift in flight.
— AAIB (@aaibgovuk) June 16, 2022
Read the report: https://t.co/1DcoePzWD2#AviationSafety pic.twitter.com/VjdVS4XdHC
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Jun-2022 18:33 | harro | Added |
| 16-Jun-2022 18:34 | harro | Updated [Narrative] |
| 16-Jun-2022 21:24 | Dr. John Smith | Updated [Location, Source, Embed code, Narrative, Category] |
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