Aviation machinist’s mate

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Aviation machinist’s mate
Rating Badge AD.jpg
Rating insignia
Issued by: United States Navy
Type Enlisted rating
Abbreviation AD
Specialty Aviation

An aviation machinist’s mate inspecting a jet engine for foreign object damage

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.[1]

At the E-8 level, senior chief aviation machinist’s mates look towards advancement to E-9 master chief aviation maintenanceman. At the E-9 level, senior chief aviation machinist’s mates and senior chief aviation structural mechanics look towards advancement to master chief aviation maintenanceman.

Source: http://en.wikipedia.org/wiki/Aviation_Machinist%27s_Mate