ASN Wikibase Occurrence # 277221
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| Date: | Sunday 3 April 2022 |
| Time: | 07:08 UTC |
| Type: |  Boeing 737-8H6 (WL) |
| Owner/operator: | Malaysia Airlines |
| Registration: | 9M-MLS |
| MSN: | 39333/4618 |
| Year of manufacture: | 2013 |
| Total airframe hrs: | 22432 hours |
| Engine model: | CFMI CFM56-7B26E |
| Fatalities: | Fatalities: 0 / Occupants: 135 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | E of Kuala Lumpur -
 Malaysia
|
| Phase: | En route |
| Nature: | Passenger - Non-Scheduled/charter/Air Taxi |
| Departure airport: | Kuala Lumpur International Airport (KUL/WMKK) |
| Tawau Airport (TWU/WBKW) | |
| Investigating agency: | AAIB Malaysia |
| Confidence Rating: |  Accident investigation report completed and information captured |
Malaysia Airlines flight MH2664, a Boeing 737-8H6, suffered a sudden pitch-up event en route between Kuala Lumpur
and Tawau.
The aircraft was cruising at FL250 when it deviated approximately 30 NM right of VPK due to weather. While waiting for ATC clearance to climb, its autopilot tripped, and the aircraft pitched up unexpectedly. The Captain pushed the control column forward, where he realised the airspeed was decreasing.
The highest recording vertical acceleration during the aircraft's pitch-up was 1.78G, followed by a minimum of -0.15G during the pitch-down.
The captain glanced at the FO side, and his speed was increasing. There were IAS and ALT disagree indicators on the screens.
This manoeuvre triggered the clacker sound. The Captain and FO cross-checked and concluded that the Captain's instrument was faulty. Immediately, the FO took over to fly manually.
After settling down, the aircraft systems were back to normal. The autopilot and autothrottle were re-engaged. The captain carried out the non-normal checklist. While the Captain and FO were doing the non-normal checklist, the instrument discrepancies happened again for the second time. The Captain and FO managed to control the aircraft. However, the instrument discrepancies were faulty on the FO side, and the Captain pitot light was illuminated. The Captain and FO continued with the non-normal checklist and advised engineering regarding the issue. The engineers advised the Captain and FO to return to KUL.
From this event, two of the cabin crew sustained light injuries, two passengers suffered a slight burn on the arm from a hot drink, and one passenger hit his shoulder at the service cart.
FDR data showed that Pitot Heat Left was off throughout the flight and the aircraft flew through clouds at 25000 ft. Ice would have gradually built up on the left-hand (captain's side) pitot probe. The ice build-up on the probe would have caused the discrepancy in the captain's IAS indication.
The drop in the IAS indication, compared to the F/O IAS, would have triggered the Master Caution warning.
It was considered possible that the crew overlooked the popped Circuit Breaker for the left-hand pitot heating system during visual inspection prior to departure.
Accident investigation:
 |
|
Sources:
https://www.nst.com.my/news/nation/2022/04/786216/mas-boeing-flight-dives-passengers-float-their-seats
https://www.flightradar24.com/data/aircraft/9m-mls#2b5da11b
Images:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Apr-2022 09:38 | harro | Added |
| 08-Apr-2022 09:39 | harro | Updated [Photo] |
| 09-Jun-2022 16:32 | harro | Updated [[Photo]] |
| 17-Dec-2023 17:51 | harro | Updated [Total occupants, Other fatalities, Narrative, Accident report] |
| 17-Dec-2023 18:34 | harro | Updated [Other fatalities, Narrative] |
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