My old boss used to work on Vulcans, he has many stories but this is the best.
A Vulcan was in the hanger for a major service. It was sitting on 3 big jacks, one under each wing and one under the nose. Part of the service involved setting up the landing gear sequencing cam. Remember this is pre computer days so it was mainly electro-mechanical. The landing sequence worked off a cam shaft, various lobes of which triggered bay door open, pressurise hydraulics, lock doors open, lower gear, lock pin deployment etc. By all accounts they were a sod to setup.
An up and coming almost passed out apprentice had been given the task of setting it up BUT was under strict instructions NOT to test it until his work had been checked. He thought he would try and lock good and whilst sitting in the cockpit triggered the landing gear down cycle. Unfortunately he’d got it VERY wrong. The potent hydraulics smashed the gear through the still locked doors with a deafening sound of tearing metal. Such was the forces involved the Vulcan rocked back and up off its jacks the nose rising into the air.
Staff threw themselves out of the hanger as the plane crashed back down onto its nose jack! The almost serviced plane needed extensive repairs……….
The apprentice and his instructor had to suffer a stern listening too whilst on the spiky chair.