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Without getting too technical, Mast Bumping is when the rotor system (of a two bladed helicopter) becomes “unloaded” during a low G situation. The weight of the aircraft is no longer suspended beneath the rotor system; the hub and blades. If there is any left or right roll of the aircraft during this time and the pilot attempts to correct, the unloaded rotor hub can strike the mast up to the point of breaking it clean off.
The point being don’t get into a low G scenario in the first place in a two bladed helicopter and if you do, recover with the correct control inputs (gentle aft cyclic).
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Kurt
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