PPRuNe Forums - View Single Post - AirAsia issue SYD today?
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Old 8th Sep 2016, 02:13
  #43 (permalink)  
CurtainTwitcher
 
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After lining-up they also didn't notice the >30 degree discrepancy between the indicated heading of 193'M and that they were on runway 16.
From the report page 24
Recorded data indicated the captain had PLAN mode selected on his ND until after pushback and just prior to engine start. This precluded the ADIRS IRS align check being carried out in accordance with the FCOM. The FO had NAV or ARC mode selected on his ND for most of the pre-flight and then PLAN mode prior to pushback until engine start.

Based on the selected ND modes it is likely that the data integrity checks detailed in the pre-flight and taxi procedures were either omitted or conducted with the ND selected to an inappropriate mode and/or range that concealed the aircraft’s positional error.

The recorded data also indicated that the FO selected plan mode and every available ND range during the line-up/take-off roll. This may indicate that the FO was attempting to interpret an unusual display on the ND associated with the positional error.
The FO probably realised something serious was wrong with this picture...
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