# Lycoming IO-390-A3A6 - Type: Engine model (FAA registry) - Registry code: 42421 - Manufacturer (registry): LYCOMING - Model: IO-390-A3A6 - Engine type: Reciprocating - Power: 210 hp - Data sheet: [TCDS E00006NY](https://openairdocs.org/tcds/E00006NY) (OpenAirDocs) - Holder: Lycoming Engines - Installed in: 1 registered aircraft - Page: https://openairdocs.org/engine/lycoming-io-390-a3a6 Model codes come from the FAA registry's reference file. ## ADs that may apply (OpenAirDocs) Matched to this engine model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment. - [AD 2026-04-11](https://openairdocs.org/ad/2026-04-11): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 605 more. Effective Apr 8, 2026 - [AD 2012-19-01](https://openairdocs.org/ad/2012-19-01): Crankshafts · Lycoming Engines AEIO-360-A1A, AEIO-360-A1B, AEIO-360-A1B6 and 321 more. Effective Oct 24, 2012 - [AD 2012-03-06](https://openairdocs.org/ad/2012-03-06): Fuel servo diaphragm · Continental Motors 6-260-A, 6-285-A, 6-285-B and 482 more. Effective Feb 24, 2012 - [AD 2009-02-03](https://openairdocs.org/ad/2009-02-03): Fuel injection servos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 261 more. Effective Feb 9, 2009 Historical (superseded or no longer in force): - [AD 2024-21-02](https://openairdocs.org/ad/2024-21-02) (historical): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 548 more. Effective Dec 5, 2024 ## Information bulletins (advisory) (2) - [SAIB NE-19-08](https://openairdocs.org/saib/NE-19-08): Reciprocating Engine Cylinder Section - Lycoming Engines Parallel Valve Cylinders. Issued May 2, 2019 - [SAIB NE-14-13](https://openairdocs.org/saib/NE-14-13): Reciprocating Engine - Cylinder Mounting Studs. Issued Mar 24, 2014 ## Registered aircraft (1) - [N9466B](https://openairdocs.org/aircraft/N9466B): [Stoots David A](https://openairdocs.org/faa-owner/STOOTS%20DAVID%20A), [Fairbanks, AK](https://openairdocs.org/faa-place/AK/Fairbanks), built 1958, S/N 55484 ## NTSB investigations None matched to aircraft with this engine model. ## FAA accident and incident reports None matched to aircraft with this engine model. ## STCs that may be installed (OpenAirDocs) (5) Approved for this engine model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has. - [STC SE00825WI](https://openairdocs.org/stc/SE00825WI): Installation of Specialty Products Spin-on oil filter on Lycoming Engines. B & C Specialty Products Inc - [STC SE04349CH](https://openairdocs.org/stc/SE04349CH): Installation of SureFly electronic ignition. SureFly Partners Ltd - [STC SE02352CH](https://openairdocs.org/stc/SE02352CH): Installation of Challenger cleanable oil filter assembly. Challenger Aviation Products Inc - [STC SE03232CH](https://openairdocs.org/stc/SE03232CH): Installation of Engine Preheat Kit p/n TA2925-1 for 115 volt application. Hartzell Propeller Inc - [STC SE04577CH](https://openairdocs.org/stc/SE04577CH): Install an electronic engine ignition system. Electroair Acquisition Corp ## PMA parts (OpenAirDocs) (599, first 50) Current parts manufacturer approvals (PMA): parts the FAA has approved companies to make as replacements or modifications. Each record lists its models as free text; OpenAirDocs matched them to this engine model on its data sheet, so check the FAA record before relying on it. Newest first. - [CF07A22996](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID171621576520240715164043.0001): Bracket, Fuel Manifold. PRECISION AIRMOTIVE LLC · PMA PQ0111NM · Replaces 07A22996 · Jun 24, 2024 - [CFSTD-160](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID170676910820240715164045.0001): Washer, 1/4 Lock, Internal Teeth. PRECISION AIRMOTIVE LLC · PMA PQ0111NM · Replaces STD-160 · Jun 24, 2024 - [CFLW-25-0.50](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID156998595520240715164044.0001): Bolt, 1/4-20 X 0.50 HEX HD. PRECISION AIRMOTIVE LLC · PMA PQ0111NM · Replaces LW-25-0.50 · Jun 24, 2024 - [CF75009](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID147128829420240715164042.0001): Bracket, Fuel Manifold. PRECISION AIRMOTIVE LLC · PMA PQ0111NM · Replaces 75009 · Jun 24, 2024 - [CF07A23032](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID132855100420240715164043.0001): Bracket, Fuel Manifold. PRECISION AIRMOTIVE LLC · PMA PQ0111NM · Replaces 07A23032 · Jun 24, 2024 - [CF07A22995](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID131816854420240715164043.0001): Bracket, Fuel Manifold. PRECISION AIRMOTIVE LLC · PMA PQ0111NM · Replaces 07A22995 · Jun 24, 2024 - [CFSTD-251](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID129676558220240715164045.0001): Washer, #10 Lock, Internal Teeth. PRECISION AIRMOTIVE LLC · PMA PQ0111NM · Replaces STD-251 · Jun 24, 2024 - [CFSTD-82](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID123933662120240715164045.0001): Screw, #10-24 X 1/2, RD HD. PRECISION AIRMOTIVE LLC · PMA PQ0111NM · Replaces STD-82 · Jun 24, 2024 - [ES3018](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID194884707820251216184204.0001): Clamp, Bearing Cap. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3018 · May 20, 2024 - [AM-3021](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID194256093820251216184144.0001): Screw Distributor Block. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3021 · May 20, 2024 - [ES3221](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID189601053820251216184228.0001): Screw. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3221 · May 20, 2024 - [AK-3975](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID181109606820251216184201.0001): Coil, Ignition. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3009, M3114, M3525, K3975, K3975 · May 20, 2024 - [AM-3015](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID180990573320251216184149.0001): Screw, Housing. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3015 · May 20, 2024 - [AM-3006](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID178460806720251216184151.0001): Bearing. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3006 · May 20, 2024 - [AM2536](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID175576430320251216184152.0001): Woodruff Key. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M2536 · May 20, 2024 - [ES3040](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID175045989620251216184205.0001): Coil Wedge. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3040 · May 20, 2024 - [ES917](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID170587168620251216184202.0001): Impulse Coupling Spring. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M917 · May 20, 2024 - [AK-3984](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID168254730520251216184200.0001): Capacitor. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3183, K3984 · May 20, 2024 - [AM-2556](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID164604517920251216184155.0001): Cotter Pin. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M2556 · May 20, 2024 - [ES3637K](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID163564757720251216184213.0001): Contact Point Secondary. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3637 · May 20, 2024 - [AM-3062](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID155261831320251216184153.0001): Oil Seal. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3062 · May 20, 2024 - [ES3084](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID152458666320251216184211.0001): Air Vent With Hood. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3084 · May 20, 2024 - [AM-3217](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID152412216720251216184157.0001): Wave Spring Washer. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M-3217 · May 20, 2024 - [AM-3485](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID151878274520251216184156.0001): Bearing Cap, Assembly. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3485 · May 20, 2024 - [AM-3215](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID151335825620251216184148.0001): Brush Assy, Distributor. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3215 · May 20, 2024 - [ES3548](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID150971763920251216184224.0001): Machining, Rotating Magnet. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3548 · May 20, 2024 - [AM-3020](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID134367835920251216184146.0001): Screw. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3020 · May 20, 2024 - [ES3822](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID133744562220251216184220.0001): Dist. Block & Gear Assy.. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces K3822 · May 20, 2024 - [ES1077](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID132381862220251216184212.0001): Air Vent. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M1077 · May 20, 2024 - [AM3611](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID125128266220251216184158.0001): Cam. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3611, M1522 · May 20, 2024 - [ES3827](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID113316784520251216184222.0001): Rotor Gear. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces K3827 · May 20, 2024 - [ES3826](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID112237278720251216184206.0001): Spacer. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3826 · May 20, 2024 - [ES3630](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID108310017320251216184222.0001): Bearing Cap, Assembly. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3630, K3630 · May 20, 2024 - [ES3172](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID103914286320251216184209.0001): Washer. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3172 · May 20, 2024 - [A-13081K](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID103306043420251216184147.0001): Contact Assembly. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3081 · May 20, 2024 - [ES3019](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID100047104220251216184208.0001): Nut. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M3019 · May 20, 2024 - [ES4370](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID196983494720240301172623.0001): Magneto. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 4370 · Dec 1, 2023 - [KA14012](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID193394967720240301172702.0001): Harness. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces M4012 · Dec 1, 2023 - [No part number](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID189210274620240301172642.0001): Hartzell Engine Technologies LLC · PMA PQ1383CE · Dec 1, 2023 - [ES12681](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID143043735220240301172643.0001): Gasket. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces LW12681 · Dec 1, 2023 - [No part number](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID122172067820240301172627.0001): Hartzell Engine Technologies LLC · PMA PQ1383CE · Dec 1, 2023 - [ES4345](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID106747695420240301172623.0001): Magneto. Hartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 4345 · Dec 1, 2023 - [TA2925-1](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID193237775520231109132301.0001): Engine Preheat Kit. Hartzell Propeller LLC · PMA PQ2040CE · Modification part · Oct 30, 2023 - [TA2925-2](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID176004176820231109132302.0001): Engine Preheat Kit. Hartzell Propeller LLC · PMA PQ2040CE · Modification part · Oct 30, 2023 - [KA14012](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID136055414920230821125952.0001): Harness. Kelly Aerospace Energy Systems LLC · PMA PQ4176CE · Replaces M4012 · May 5, 2023 - [ES12681](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID167811005920230502200155.0001): Gasket. Kelly Aerospace Energy Systems LLC · PMA PQ4176CE · Replaces LW12681 · Feb 9, 2023 - [ES1553](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID112971925920230330124434.0001): Screw, Harness Cap. Kelly Aerospace Energy Systems LLC · PMA PQ4176CE · Replaces M1553 · Oct 27, 2022 - [MC31C13P03](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID930813201320210723144523.0001): Stud. McFarlane Aviation Inc · PMA PQ3732CE · Replaces 31C13, 31C-13P03, 67528 · Jun 10, 2021 - [MC31C13P12](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID818404516820210723144524.0001): Stud. McFarlane Aviation Inc · PMA PQ3732CE · Replaces 31C13, 31C-13P12, 67528 · Jun 10, 2021 - [MC31C13P07](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID299483378620210723144523.0001): Stud. McFarlane Aviation Inc · PMA PQ3732CE · Replaces 31C13, 31C-13P07, 67528 · Jun 10, 2021 All of them: https://openairdocs.org/engine/lycoming-io-390-a3a6/pma.md --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.