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Printed page label not indexed. PDF page 1.
an erroneously low airspeed. The autopilot remained engaged and pitched the aircraft nose-down to regain indicated airspeed. The pitch reached 7.6° nose-down with an associated 6,240 ft/min descent rate, before the aircraft exited icing conditions, correct airspeed wasOpen official document at PDF page 1AAIB final report: G-ONEE
Printed page label not indexed. PDF page 3.
pitch but the speed continued to decay, and the aircraft continued to pitch further nose-down reaching a recorded 7.6° nose-down with associated 6,240 ft/min rate of descent. The crew recalled receiving an ias disagree alert and they reported that theyOpen official document at PDF page 3AAIB final report: G-ONEE
Printed page label not indexed. PDF page 6.
(FMC). Around this time, they entered icing conditions and the aircraft began to pitch nose-down. This was recognised by the commander who alerted the PF and told him to “reduce the body angle”. The PF added thrust, which is theOpen official document at PDF page 6AAIB final report: G-ONEE
Printed page label not indexed. PDF page 10.
values selected by the crew on the mode control panel. The aircraft pitch reached 7.6° nose-down and the descent rate reached approximately 6,240 ft/min. With decreasing recorded IAS, the crew briefly manually increased the thrust. As the TAT probe temperatureOpen official document at PDF page 10AAIB final report: G-ONEE
Printed page label not indexed. PDF page 16.
FLCH modes will result in the autopilot flying too nose-up (too slow) in a climb or too nose-down (too fast) in a descent. For V/S mode to be affected the static ports would need to freeze. Cabin pressurisation system TheOpen official document at PDF page 16AAIB final report: G-ONEE
Printed page label not indexed. PDF page 39.
With the autopilot engaged in flch mode, the system responded by commanding increasing nose-down pitch to maintain the selected airspeed. Although the crew added thrust, the frozen probes meant the indicated airspeed continued to reduce, resulting in further nose-down pitOpen official document at PDF page 39AAIB final report: G-ONEE