Malaysia Airlines Flight 124 (2005)
Malaysia Airlines Flight 124
Summary
1 August 2005
Malaysia Airlines flight MH124 a scheduled international passenger service from Perth, Australia to Kuala Lumpur, Malaysia.
The aircraft was a Boeing 777-200 registered 9M-MRG.
When the aircraft climbed 38,000 feet (FL380) a faulty accelerometer caused the aircraft's Air Data Inertial Reference Unit (ADIRU) to command changes of altitude. An extract from the ATSB report summarises the incident:-
The crew reported that, during climb out, they observed a LOW AIRSPEED advisory on the aircraft’s Engine Indication and Crew Alerting System (EICAS), when climbing through flight level (FL) 380. At the same time, the aircraft’s slip/skid indication deflected to the full right position on the Primary Flight Display (PFD). The PFD airspeed display then indicated that the aircraft was approaching the overspeed limit and the stall speed limit simultaneously. The aircraft pitched up and climbed to approximately FL410 and the indicated airspeed decreased from 270 kts to 158 kts. The stall warning and stick shaker devices also activated. The aircraft returned to Perth where an uneventful landing was completed.
Source: In-flight upset event 240 km north-west of Perth, WA Boeing Company 777-200, 9M-MRG, ATSB Aviation Occurrence Report 200503722
https://www.atsb.gov.au/publications/investigation_reports/2005/aair/aair200503722