FAA-PMA
1637-3 is an FAA-PMA part held by Avtech Tyee Inc. (PMA PQ0136NM) — approved as a replacement for 1637-3 on Boeing 747-200F Series, 747-300 Series, 747-400 Series, 747-400F Series · Current, Aug 2012.
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.
1637-3 is cataloged as COUPLING,SHAFT,FLEXIBLE. It carries 1 NSN identity and cross-references to 2 related part numbers. FAA PMA approval is on file from Avtech Tyee Inc. An estimated 10 aircraft of the approved type are registered in the US. The part appears on MCRL cross-reference data.
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