Originally Posted by
Diff Tail Shim
Blown flaps meant the tailplane flap was blown as well if hazy Q course memories from 38 years ago spring to mind.
The actual tailplane flap wasn't blown, it was the lower leading edge of the tailplane.
Another interesting feature of the tailplane flaps was that they were warped by stops at the tip and the actuator, so they fed in gradually from the inboard to outboard as they were raised.
40 years since Q.....
Cheers!