HDG & TRU and Autopilot Behaviour (B744)
I've noticed that if you manually select TRU (on the P2 panel) on the ground, that the ND compass and HDG bug rotate (where there is magnetic variation).
If you happened to have the A/P engaged in HDG SEL and did this, I assume the aircraft would fly to the HDG bug. If you had HDG HOLD selected, would the aircraft turn, or fly straight on?
Does the A/P memorise a magnetic heading value during HDG HOLD? (and would make the same turn as HDG SEL upon selection of TRU?)
Thanks.
Rgds.
NSEU