On 7 October 2008 , Qantas Flight 72 , using the same aircraft involved in the Flight 68 incident , departed Singapore for Perth . Some time into the flight , while cruising at 37,000 ft , a failure in the No. 1 ADIRU led to the autopilot automatically disengaging followed by two sudden uncommanded pitch down manoeuvres , according to the Australian Transport Safety Bureau ( ATSB ) . The accident injured up to 74 passengers and crew , ranging from minor to serious injuries . The aircraft was able to make an emergency landing without further injuries . The aircraft was equipped with a Northrop Grumman made ADIRS , which investigators sent to the manufacturer for further testing
Qantas Flight 72
Qantas Flight 72
Air data inertial reference unit