Hi all
I stand corrected on which Marchetti replaced which. An IRAN inspection is one carried out on a Military aircraft and would be the equivalent of a "D" check on a civil transport aircraft.Basically, the aircraft is taken to pieces and everything is overhauled.On the Marchetti, this meant that at 1500 hrs elapsed flight time, the engine,instruments,etc came off the airframe and went for overhaul and the airframe was stripped to the skin and had all the lifed items such as wing-bolts, undercarriage,pumps and motors,etc exchanged for new units.Also,the aircraft were repainted.It generally took the Don 8 mths-1 yr to do each aircraft(except when they had Skull and Sailor in, who did the same job in 2 months, but that's another story). Unlike a civvie C of A, cost is/was not an issue and the aircraft were as good as new, literally, when they came out.
regards
GttC