Old 8th Sep 2016, 00:52
  #41 (permalink)  
BuzzBox
 
Join Date: Mar 2002
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Originally posted by NSEU
Also, the magnetic heading data fed into the VOR systems is based on IRU present position (which appears to have been wrong). I'm surprised the aircraft reached Melbourne with vectors (unless they were using their whiskey compass).
The report says the FO subsequently carried out the IRS ALIGNMENT IN ATT MODE checklist from the QRH. That would have restored attitude and heading information once the aircraft's magnetic heading (from the standby compass) was entered into the MCDU. The heading would then need to be updated periodically, just like an old-fashioned gyro compass.
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