Part of the problem is that the CASA FCAT program inhibits FOI’s from remaining current enough to be safe
One wonders what the FOI was doing there? Ballast? The stuff about not being able to communicate and needing to tap the check pilot just doesnt pass the smell test.
And if they briefed beforehand on the tap signalling system, then surely the flight programme was discussed and the engine out procediure was part of the flight that was discussed with and approved by the FOI.