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| Date: | Monday 12 April 2021 |
| Time: | 11:10 |
| Type: |  Airbus A350-1041 |
| Owner/operator: | Qatar Airways |
| Registration: | A7-ANO |
| MSN: | 368 |
| Year of manufacture: | 2020 |
| Engine model: | Rolls-Royce Trent XWB-97 |
| Fatalities: | Fatalities: 0 / Occupants: |
| Other fatalities: | 0 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | W of Isfahan -
 Iran
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Doha-Hamad International Airport (DOH/OTHH) |
| Los Angeles International Airport, CA (LAX/KLAX) | |
| Investigating agency: | AAIB Iran |
| Confidence Rating: |  Accident investigation report completed and information captured |
Qatar Airways flight QR739, a Airbus A350-1041 (A7-ANO) was en route over Iran at FL340 when a TCAS Resolution Advisory (RA) alerted the crew to climb to maintain separation from a Caspian Airlines MD-83 (EP-CAS) flight CPN6984. While climbing, a stall warning occurred.
The MD-83 had climbed 400 feet above the cleared level due to an auto pilot malfunction.
Causes:
The Aircraft Accident Investigation Board (AAIB) determined that the main cause of serious incident was incorrect reaction of pilot for MD83 about malfunction of alternate trim motor control and excessive manual trimming of the aircraft which caused level bust and generating TCAS RA for both aircraft.
Cockpit crew of A350 did not follow FCTM recommendation and selected OP DES in a low energy situation, and especially at high altitude that caused “Low Energy” warning.
Accident investigation:
 |
|
Sources:
https://www.bea.aero/en/investigation-reports/notified-events/detail/serious-incident-to-the-airbus-a350-registered-a7-ano-operated-by-qatar-airways-and-to-the-mcdonnell-douglas-md83-registered-ep-cas-operated-by-caspian-airlines-on-12-04-2021-en-route/
https://www.flightradar24.com/data/aircraft/a7-ano#275f37ac
https://www.cao.ir/web/english/investigation-reports?p_p_id=NetFormGetFile_WAR_NetForm&p_p_lifecycle=2&p_p_resource_id=getFile&_NetFormGetFile_WAR_NetForm_file=aCtwR3FHVEgwaUJDQmJMTHNLOFNVNTVCQXZKSzl2RGtZVlBDNnVFV0d2eStpMXNkRTZ2ZG5jZk8zeSsvUWhLaGZCcWRCbXFaTXJZQgppVTVwNDAzT3VnPT0=.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Apr-2021 17:36 | harro | Added |
| 23-Apr-2021 17:46 | harro | Updated [Narrative, ] |
| 06-Jan-2022 08:56 | xrecovery9 | Updated [Source, Narrative, ] |
| 06-Jan-2022 08:57 | harro | Updated [Narrative, Accident report, ] |
Corrections or additions? ... Edit this accident description
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