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Printed page xv. PDF page 17.
Singapore on a scheduled passenger transport service to Perth, Western Australia. At 0440:26, while the aircraft was in cruise at 37,000 ft, ADIRU 1 started providing intermittent, incorrect values (spikes) on all flight parameters to other aircraft systems. Soon after,Open official document at PDF page 17ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 1. PDF page 21.
second officer then occupied the right control seat.4 Start of occurrence sequence (0440:26) At 0440:26, one of the aircraft's three air data inertial reference units (ADIRU 1) started providing incorrect data to other aircraft systems. At 0440:28, the autopilot automaOpen official document at PDF page 21ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 33. PDF page 53.
flights. Overview of FDR data The FDR data showed that the flight was uneventful until 0440:26, when anomalies in the recorded data for the ADIRU 1 parameters commenced. The first recorded anomaly was a deviation in the pitch attitude. AtOpen official document at PDF page 53ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 34. PDF page 54.
-0310:25 Takeoff from Singapore 0201:16 -0241:11 Aircraft reached top of climb (37,000 ft) 0440:26 -0002:01 Start of incorrect ADIRU 1 data (oscillation in pitch attitude) 0440:28 -0001:59 Autopilot 1 disconnected (involuntary) 0440:28 -0001:59 First of many master warnings 0Open official document at PDF page 54ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 36. PDF page 56.
CAPT ON 3 IR 3 Summary of ADR data for the occurrence flight (from the FDR) Soon after 0440:26, spikes became evident on all of the recorded ADR parameters from ADIRU 1 (Figure 19). The recorded spikes occurred at differentOpen official document at PDF page 56ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 38. PDF page 58.
spikes for the IR parameters, both for magnetic heading (at 0441:38 and 0442:04). From 0440:26 to 0440:31, some of the IR parameters showed deviations from their correct values. After 0440:31, the IR 1 Fail parameter continuously recorded a fail valueOpen official document at PDF page 58ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008