RING,WIPER
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4177-1 is cataloged as RING,WIPER. It carries 2 NSN identities and cross-references to 2 related part numbers. FAA PMA approval is on file from Air Repair Inc. The part appears on MCRL cross-reference data.
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FAA-PMA
PMA PQ1668CE. Approved as a replacement for 4177-1 on Air Repair, Inc. W670-6A, -16, -K, -6N (Piston) · Current, Oct 2014.
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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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