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What does MGB stand for?

MGB stands for Main Gear Box

This definition appears somewhat frequently

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Other Resources:
We have 74 other meanings of MGB in our Acronym Attic

Samples in periodicals archive:

AMAN Justin Rodriguez HM-14 Det 1 During a structural airworthiness inspection for a repeat flight-control gripe on an MH-53E, AMAN Rodriguez discovered a 1/8-inch gap between the mounting bracket on the stationary scissors on the main gear box and the main-gear-box mounting pad.
The engines continued to drive the main gear box and rotor head throughout the sequence, arcing the fuselage around until all the blades were completely sheared off from the rotor head.