On the helicopter side at Blackpool our own engineers move our A/Cs about helicentre, site there R22m in the middle of the field by the tower most of the time they handle the other 22 out of the hangar so little course for pos damage there not clear what happens at the bottom end of the site with the other guys though although there is a bit of a squize at that end due to planks.
Sincerely
Bravo 99 (AJB)