FAA-PMA
YA171 is an FAA-PMA part held by Yesteryear Aviation Inc. (PMA PQ4039CE) — approved as a replacement for 171 on Lycoming R-680-E1, E2, E3, E3A, E3B, B4, B4B, B4C, B4D, B4E · Current, Aug 2011.
A PMA part is approved for the specific eligibility listed on its FAA record; whether it may go on a particular aircraft, engine or component is the installer's determination from that record and the eligibility list. A part-number match alone does not establish eligibility. Source: FAA DRS PMA database, refreshed weekly. Data, not advice.
YA171 does not appear in the federal supply catalog. An FAA PMA relationship is on file.
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