Strange? We did Majors, Minors and all other servicing IN HOUSE during the 70's/ early 80's in Base hangar. Why the change to Saints??
Looks like the guy in that pic is contemplating having to go in a tank a lovely job I got chose for as Im a shorty! Sitting in there for a shift with a breather on and a tin of tank sealer Then going home and being told to strip off at the door because I stink of AVTUR