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859989-4PR does not appear in the federal supply catalog. An FAA PMA relationship is on file.
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FAA-PMA
PMA PQ2464CE. Approved as a replacement for Garrett Piston Ring P/N 859989-4 Applicable to Garrett 7 inch Dia. Electric Shutoff Valve P/N 398310-4-1 on Boeing 747-100 Series, 747-200 Series, per TCDS A20WE, Rev. 22, dated 6/1/92 (Ring, Piston) · Current, Feb 2014.
A PMA part is approved for the specific eligibility listed on its FAA record; whether it may be installed on a particular aircraft, engine or component is the installer's determination. This page states the FAA record and the listings on PartsAndPlanes.
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