FAA-PMA
550 18 is an FAA-PMA part held by Hartzell Engine Technologies LLC (PMA PQ1383CE) — approved as a replacement for 534685 on Continental Aerospace Technologies Inc.. IO-470-C1B | IO-470-C8B | IO-470-C9B | IO-470-C10B | IO-470-C11B | IO-470-C12B | IO-470-C14B | IO-470-D12B | IO-470-D19B | IO-470-D27B | IO-470-D30B | IO-470-D42B | IO-470-D44B | IO-470-D52B | IO-470-D52C | IO-470-D53B | IO-470-D54B | IO-470-D55B | IO-470-D56B | IO-470-D57B | IO-470-D58B | IO-470-E1B | IO-470-E6B | IO-470-E13B | IO-470-E17B | IO-470-E18B | IO-470-E19B | IO-470-E20B | IO-470-E21B | IO-470-E22B | IO-470-F1B | IO-470-F3B | IO-470-F4B | IO-470-F7B | IO-470-F18B | IO-470-F19B | IO-470-F19K | IO-470-F26B | IO-470-F26C | IO-470-F26D | IO-470-F27B | IO-470-F28B | IO-470-F29B | IO-470-F30B | IO-470-F31B | IO-470-F32B | IO-470-F33B | IO-470-F34B | IO-470-F36B | IO-470-F37B | IO-470-H1B | IO-470-H6B | IO-470-J1B | IO-470-J8B | IO-470-J9B | IO-470-J10B | IO-470-K3B | IO-470-K6B | IO-470-K11B | IO-470-K12B | IO-470-K14B | IO-470-K15B | IO-470-K16B | IO-470-K17B | IO-470-K18B | IO-470-K19B | IO-470-K20B | IO-470-K21B | IO-470-K22B | IO-470-K23B | IO-470-K24B | IO-470-K25B | IO-470-K26B | IO-470-K27B | IO-470-K28B | IO-470-K29B | IO-470-K30B | IO-470-L5B | IO-470-L8B | IO-470-L9B | IO-470-L11B | IO-470-L12B | IO-470-L15B | IO-470-L19B | IO-470-L20B | IO-470-L21B | IO-470-L22B | IO-470-L23B | IO-470-L24B | IO-470-L25B | IO-470-L26B | IO-470-L27B | IO-470-L28B | IO-470-L29B | IO-470-L31B | IO-470-L32B | IO-470-M1B | IO-470-M5B | IO-470-M6B · Current, Sep 2025.
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.
550 18 is cataloged as DRILL,TWIST. It carries 1 NSN identity and cross-references to 8 related part numbers. FAA PMA approval is on file from Aviation Products Systems Inc. An estimated 232 aircraft of the approved type are registered in the US. The part appears on MCRL cross-reference data.
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