Early 90's, line training in a Metroliner into Mount Isa . Shutdown, disembark passengers & note an FOI & AWI wandering around the aircraft. FOI then starts to ask questions.
Line trainer (formerly very senior CASA management) pops his head out of the door & instructs both the FOI & AWI to return to the airport gate, come back out & identify themselves correctly as the first step required of a ramp check.
Ramp checkers do as instructed & we receive a pleasant & cursory ramp check.