A Parts Manufacturer Approval (PMA), is an alternate replacement part approved by the FAA. PMA parts are used in maintenance for type-certificated aircraft and engines. Approval for PMAs are granted based on a combination of design, production, and installation in one single document. PMA has a long history dating back almost 60 years to World War 2. After the war, there was a big supply of surplus military aircrafts. During this time, most OEMs who manufactured aircraft parts and aviation hardware components during the war went back to their regular production of automobiles and appliances. This made securing aircraft parts difficult. To assist this growing market, the FAA introduced PMA regulations to assist in the availability of aircraft replacement parts.
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