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Printed page 73. PDF page 93.
values for AOA 1 and AOA 2 were not used for determining AOAFCPC input. At the end of a 1.2-second memorisation period, the FCPCs used the average of the current AOA 1 and AOA 2 values as the AOAFCPC inputOpen official document at PDF page 93ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 74. PDF page 94.
Step-change A significant step-change of either AOA 1 or AOA 2 would trigger a 1.2-second memorisation period and have no effect on AOAFCPC input (see scenario A in Figure 29). If the change lasted for more than 1 second, theOpen official document at PDF page 94ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 76. PDF page 96.
detected, the last valid value of AOAFCPC input is used for 1.2 seconds. After the 1.2-second memorisation period, the next values of AOA 1 and AOA 2 are assumed to be valid, and they are used to calculate AOAFCPCOpen official document at PDF page 96ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 79. PDF page 99.
two-spike scenario with the following properties: the first AOA 1 spike triggered a 1.2-second memorisation period with the value of AOAFCPC input being 2.3° (based on the recorded AOA 1 and AOA 2 values before the spike) theOpen official document at PDF page 99ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 95. PDF page 115.
algorithm. This led to the final algorithm for processing AOA data, which included the 1.2-second memorisation period and several other changes (described in sections 2.1.4 and 2.1.5). The manufacturer advised that the 1.2-second duration of the memorisation period was coOpen official document at PDF page 115ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008
Printed page 192. PDF page 212.
a basis for filtering out deviating values of AOA 1 and AOA 2, and for triggering a 1.2-second memorisation period using the previous value if an errant value of AOA 1 or AOA 2 was detected. The FCPC algorithm wasOpen official document at PDF page 212ATSB AO-2008-070: In-flight upset, VH-QPA, 7 October 2008