someone parked a chopper in the roof of a house

[old man emu]

I audit the Quality Control Manual of a mob that maintains these machines. That means I have to delve into work packages to see that the rules are being followed. Compared to a work package for a fixed-wing aeroplane, one for a chopper is nearly as thick as War and Peace. And one of the requirements is that the maintenance data used has to be shown to immediately current at the time the work was commenced. Not only choppers expensive to manufacture and purchase, the need to  continually undergo training required to maintain them is a massive cost to the organisation if it wants to keep in business.