Do I assume the 'DBI' is like an 'RBI'? and throughout the whole exercise P2 had a fully working IRS driven compass and P1 a working 'DBI', plus a standby 'E2B' type compass?
The problem of ‘inability’ revolves around the crew’s apparent failure to recall this technical detail; I surmise that this could have been due to mental workload, memory degradation with time, or that the aspect had not been taught.
- I cannot see how anyone could have missed those headings? The ILS display on both P2 and the standby would have worked, radar headings would have worked. Surely the only real 'problems' were a non-functioning P2 and the pitch detail on the standby AI? The trim change would have definitely caused a 'wobbler' if flying on the Standby AI. I wonder if the F/O is still a 'training' F/O..........................?