Agree with all the above but slight variations.
Hydraulic rigs often in the States refered to as mules. Two types - 'wet' and 'dry'
He was specific in that it was a dry rig that used the aircraft reservoirs. Wet rigs have their own reservoirs. Some are dual.
Engine fuel inhibitor generally removed by a 'dry run'. Engine rotated, fuel valves opened but no ignition. Inhibitor then ends up in tailpipe and drain can. This dry run also used for basic leak check. ( Engine ends up pretty wet so I dont know why they call it a dry run !)
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