Hi ,
The following is part of the report for QF72 pitch down event.
I don't know much about Airbus systems and was wondering if one of you folk who are expert in this area could shine some light on why these two events are not related. The similarity I see is the AOA values spiking.
I know they are different machines but are there common parts/equipment in the AOA or FAC systems?
I apologise if the observation is too simplistic.
Framer
. In cruise, a typical AOA is +2 degrees.
The first AOA Left spike19 occurred at 0440:34 UTC. AOA Left values changed from +2.1 degrees to +50.6 degrees and back to +2.1 degrees over three successive samples. Forty-two AOA Left spikes were recorded before the aircraft touched down at Learmonth. As AOA Left is sampled once per second, a spike may not necessarily be sampled and recorded. As a result, the number of actual AOA Left spikes may have been larger than the number recorded.
Spikes were also evident in the following parameters:
•
pressure altitude
•
computed airspeed
•
mach number
•
static air temperature
•
pitch angle
•
roll angle
•
wind speed
•
wind direction.
Effects of the spikes on failure indications
A stall warning parameter was recorded by the FDR. The first stall warning occurred at 0440:50 UTC and numerous stall warnings were recorded from this time until 0512:00 UTC when the aircraft was descending through an altitude of 12,400 ft.