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AIR21371 does not appear in the federal supply catalog. An FAA PMA relationship is on file.
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FAA-PMA
PMA PQ2681CE. Approved as a replacement for Honeywell P/N 3176985-1, Piston Ring Set, installed on the Pressure Regulator and Shutoff Valves P/Ns 3214552-1, -2, -3, -4, -5, -6 and P/Ns 3214446-3, -4 on Boeing 737-300 Series, 737-400 Series, 737-500 Series, 737-700 Series, 737-800 Series, 737-600 Series, 737-700C Series, 737-900 Series, 737-900ER Series (Piston Ring Set) · Current, May 2015.
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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