Aviation machinist's mate

Aviation machinist's mate
Rating insignia
Issued by	United States Navy
Type	Enlisted rating
Abbreviation	AD
Specialty	Aviation

Aviation machinist's mate (abbreviated as AD) is a United States Navy occupational rating.

Aviation machinist's mates maintain aircraft engines and their related systems, including the induction, cooling, fuel, oil, compression, combustion, turbine, gas turbine compressor, exhaust and propeller systems; preflight aircraft; conduct periodic inspections on engines and engine-related systems; field-test and adjust engine components, including fuel controls, pumps, valves and regulators; remove, repair and replace compressor and turbine blades and combustion chamber liners; preserve and depreserve engines, engine accessories and components; and supervise engine work centers.