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Printed page xv. PDF page 17.
(most of them spurious). The other two ADIRUs performed normally during the flight. At 0442:27, the aircraft suddenly pitched nose down. The FCPCs commanded the pitch-down in response to AOA data spikes from ADIRU 1. Although the pitch-down command lastedOpen official document at PDF page 17ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 2. PDF page 22.
the flight deck to help them diagnose and manage the problems. First in-flight upset9 (0442:27) At 0442:27 (1242:27 local time), while the second officer was asking the cabin services manager (CSM) via the cabin interphone to send the first officerOpen official document at PDF page 22ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 32. PDF page 52.
caution chime occurred at 0440:33. During the period 0440:28 (autopilot disconnection) to 0442:27 (first 40 An alternate is an aerodrome specified in a flight plan to which a flight may proceed when it becomes inadvisable to land at, or continueOpen official document at PDF page 52ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 34. PDF page 54.
37,180 ft then began to descend to 37,000 ft 0441:28 -0000:59 Autopilot 2 disconnected 0442:27 0000:00 First pitch-down event commenced 0442:28 0000:01 Captain applied back pressure to the sidestick 0442:28 0000:01 Maximum nose-down elevator position +10.3° 0442:29 0000:0Open official document at PDF page 54ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 40. PDF page 60.
recorded AOA spikes occurred at 0442:26, immediately prior to the first pitch-down (0442:27). The AOA value was 50.625°. Another of the recorded AOA spikes occurred at 0445:08, immediately prior to the second pitch-down (0445:09). The AOA value was 50.625°.Open official document at PDF page 60ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 79. PDF page 99.
AOAFCPC input could lead to the recorded elevator deflections for the first pitch-down (at 0442:27), after taking account of the sidestick pitch inputs. The simulations used a two-spike scenario with the following properties: the first AOA 1 spike triggeredOpen official document at PDF page 99ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008