# AD 81-18-04 R2: Engine Oil Pump Driven Impeller and Shaft - Type: Airworthiness directive - Status: Historical - Products: Textron Lycoming, AVCO AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A, AEIO-320-E1B, AEIO-320-E2A, AEIO-320-E2B, AEIO-360-A1A, AEIO-360-A1B, AEIO-360-A1B6, AEIO-360-A1C, AEIO-360-A1D, AEIO-360-A1E and 367 more - Effective: June 7, 1982 - Superseded by: [AD 96-09-10](https://openairdocs.org/ad/96-09-10) - Product type: Engine - Amendment: 39-4395 - Registered aircraft: 81,687 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/463F5BE1B2409D0D86256C140046B53A.0001 - DRS record last changed: August 7, 2025 - Page: https://openairdocs.org/ad/81-18-04-R2 ## The airworthiness directive 81-18-04 R2 AVCO LYCOMING: Amendment 39-4199 as amended by Amendment 39-4258 is further amended by Amendment 39-4395. Applicability: All O-235, O-290-D, -D2, O-320, IO-320, AIO-320, AEIO-320, LIO-320, O-340, O-360, IO-360, AIO-360, AEIO-360, HO-360, HIO-360, LO-360, LIO-360, TIO-360, TO-360, LTO-360, VO-360, IVO-360, O-540 and IO-540 series engines, except for the following: O-320-H2AD, O-360-E1A6D, LO-360-E1A6D, TO-360-E1A6D, LTO-360-E1A6D, IO-540-P1A5, IO-540-R1A5, IO-540-S1A5 and; O-540/IO-540 series engines built with large capacity oil pumps and dual magnetos designated with "5D" in the model suffix (Example: IO-540-K1A5D). Compliance required as indicated unless already accomplished. To prevent failure of engine oil pumps which incorporate sintered iron impellers, accomplish the following: (a) Compliance is required within the next 25 hours in service after the effective date of this AD for all Lycoming HIO-360-D1A, -E1AD, -E1BD and -F1AD up to and including serial number L-22579-51A except the following: L-22311-51A thru L-22313-51A, L-22396-51A, L-22397-51A, L-22416-51A, L-22546-51A thru L-22549-51A, L-22563-51A, L-22568-51A thru L-22571-51A, and in addition all of the above engines that were overhauled in the field prior to April 1, 1981; all remanufactured engines of the above model shipped prior to April 1, 1981, regardless of serial numbers. (1) Replace the oil pump driven impeller and shaft with hardened steel impeller and shaft P/N LW-18110 and replace the driving impeller with impeller P/N LW-18109 in accordance with the instructions set forth in AVCO Lycoming Service Bulletin No. 454 dated April 10, 1981, or approved alternate method, unless it can be established that a sintered iron impeller is not installed (see NOTE below). (b) Compliance is required within the next 25 hours in service after the effective date of this AD for: Lycoming models O-360-A1LD S/Ns L-17555-36A through L-22462-36A, O-360-A1F6D S/Ns L-16685-36Athrough L-22582-36A, O-360-A5AD S/Ns L-17057-36A through L-20038-36A, IO-360-A1B6D/-A3B6D S/Ns L-9598-51A through L-16595-51A, L-17273-51A, L-17312-51A through L-17319-51A, L-17321-51A, L-17336-51A through L-17340-51A, L-17347-51A through L-17351-51A, L-17355-51A, L-17358-51A, L-17377-51A through L-17380-51A, IO-360-C1E6D, S/N L-14527-51A, TO-360-C1A6D S/Ns L-101-69A through L-243-69A, and in addition, all of the above model engines which were overhauled in the field between April 7, 1970, and October 15, 1976, regardless of serial numbers; and all of the above model engines which were remanufactured and shipped before April 1, 1981, regardless of serial numbers. (1) Replace the existing drive and driven impellers with a steel driving impeller P/N 60746 and an aluminum impeller and shaft assembly P/N LW-13775 in accordance with AVCO Lycoming Service Bulletin No. 455A dated April 24, 1981, or approved alternate, unless it can be established that a sintered iron impeller is not installed. (See NOTE below.) (c) For all other engines in the subject Applicability paragraph not specifically listed in Paragraphs (a) and (b) above, comply with Avco Lycoming Service Bulletin No. 456 dated August 21, 1981, or FAA approved revision or alternate, at 2000 hours since new or since last overhaul, whichever is later, or whenever the accessory section is removed. Those engines which have accrued 2000 hours or more on the effective date of this AD must comply within the next 100 hours in service. Compliance is required as described herein unless it can be established that a sintered iron impeller is not installed. (See NOTE below.) Alternate methods of compliance must be approved by the Chief, New York Aircraft Certification Office. Upon submission of substantiating data by an owner or operator through an FAA Maintenance inspector, the Chief, New York Aircraft Certification Office may adjust the compliance time specified in this AD. In accordance with FAR 21.197and 21.199, the aircraft may be flown to a location where the alterations required by this AD can be performed. NOTE: Engines originally manufactured prior to 1970 did not incorporate sintered iron impellers. For these engines, reference should be made to engine maintenance/overhaul logbook records, Lycoming build records, and pertinent Service Bulletins. Service Bulletin Nos. 381C and 385C describe a method to determine if the early design oil pump with aluminum/steel impellers is installed. Aluminum/steel impellers do not require replacement. Amendment 39-4199 became effective September 14, 1981. Amendment 39-4258 became effective November 19, 1981. This amendment 39-4395 becomes effective June 7, 1982. ## Affected data sheets (12) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 1E10](https://openairdocs.org/tcds/1E10): Lycoming Engines; names 80 of 89 models: IO-360-C1D6, AEIO-360-B1G6, HIO-360-B1B, IO-360-B2F6, HIO-360-C1B, AEIO-360-B1H, AEIO-360-A1B6, HIO-360-E1BD… - [TCDS E-286](https://openairdocs.org/tcds/E-286): Lycoming Engines; names 70 of 72 models: LO-360-A1H6, O-360-C1C, O-360-C1A, O-360-E2AD, LO-360-E1BD, O-360-E2BD, O-360-B1A, O-360-A1A… - [TCDS E-274](https://openairdocs.org/tcds/E-274): Lycoming Engines; names 58 of 60 models: O-320-H3BD, O-320-D2G, O-320-E2G, O-320-D3G, O-320-C2B, O-320-E2B, O-320-E2C, O-320-D2H… - [TCDS 1E4](https://openairdocs.org/tcds/1E4): Lycoming Engines; names 45 of 81 models: IO-540-L1C5, IO-540-A1A5, IO-540-AA1B5, IO-540-B1C5, IO-540-G1A5, IO-540-C4D5, IO-540-K1K5, IO-540-C1B5… - [TCDS E-223](https://openairdocs.org/tcds/E-223): Lycoming Engines; names 40 of 43 models: O-235-K2C, O-235-M3C, O-235-A, O-235-F2A, O-235-P2A, O-235-E1, O-235-J2B, O-235-C2B… - [TCDS 1E12](https://openairdocs.org/tcds/1E12): Lycoming Engines; names 32 of 32 models: AEIO-320-E1B, AEIO-320-D2B, AIO-320-C1B, AIO-320-A1A, IO-320-B1C, IO-320-C1B, IO-320-F1A, LIO-320-B1A… - [TCDS E-295](https://openairdocs.org/tcds/E-295): Lycoming Engines; names 31 of 47 models: O-540-B2C5, O-540-B1D5, O-540-G2A5, O-540-H2A5, O-540-J3A5, O-540-B2B5, O-540-A1D, O-540-A4B5… - [TCDS E-229](https://openairdocs.org/tcds/E-229): Lycoming Division AVCO Corporation; names 5 of 10 models: O-290-D2, O-290-D, O-290-D2A, O-290-D2C, O-290-D2B - [TCDS 1E1](https://openairdocs.org/tcds/1E1): Lycoming Engines; names 4 of 4 models: IVO-360-A1A, VO-360-A1A, VO-360-B1A, VO-360-A1B - [TCDS E16EA](https://openairdocs.org/tcds/E16EA): Lycoming Engines; names 4 of 4 models: TIO-360-A1B, TIO-360-A1A, TIO-360-C1A6D, TIO-360-A3B6 - [TCDS E26EA](https://openairdocs.org/tcds/E26EA): Lycoming Engines; names 4 of 6 models: TO-360-C1A6D, TO-360-A1A6D, LTO-360-A1A6D, TO-360-F1A6D - [TCDS E-277](https://openairdocs.org/tcds/E-277): Lycoming Engines; names 3 of 3 models: O-340-A2A, O-340-B1A, O-340-A1A ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 81,687 (0 by airframe model, 81,687 by engine model) - Makers: Piper 32,028, Cessna 19,118, Mooney 3,618, Beech 1,771, Bellanca 1,693, Grumman American Avn. 1,526, Robinson Helicopter 1,497, Textron 1,495, Aviat 915, American Champion 902 Models with the most aircraft: - [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series): 27,061 aircraft (engine model) - [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series): 11,930 aircraft (engine model) - [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series): 6,173 aircraft (engine model) - [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series): 6,133 aircraft (engine model) - [Lycoming 0-540 series](https://openairdocs.org/engine/lycoming-0-540-series): 5,228 aircraft (engine model) - [Lycoming IO-540 series](https://openairdocs.org/engine/lycoming-io-540-series): 4,219 aircraft (engine model) - [Lycoming IO-360-L2A](https://openairdocs.org/engine/lycoming-io-360-l2a): 2,637 aircraft (engine model) - [Lycoming 0-290 series](https://openairdocs.org/engine/lycoming-0-290-series): 2,126 aircraft (engine model) - [Lycoming IO-320 series](https://openairdocs.org/engine/lycoming-io-320-series): 1,707 aircraft (engine model) - [Lycoming O-360 series](https://openairdocs.org/engine/lycoming-o-360-series): 1,023 aircraft (engine model) - [Lycoming IO-360-B4A](https://openairdocs.org/engine/lycoming-io-360-b4a): 985 aircraft (engine model) - [Lycoming 0-360-A1D](https://openairdocs.org/engine/lycoming-0-360-a1d): 968 aircraft (engine model) - [Lycoming AEIO-360 series](https://openairdocs.org/engine/lycoming-aeio-360-series): 881 aircraft (engine model) - [Lycoming IO-360-A1B6D](https://openairdocs.org/engine/lycoming-io-360-a1b6d): 844 aircraft (engine model) - [Lycoming IO-540-AB1A5](https://openairdocs.org/engine/lycoming-io-540-ab1a5): 771 aircraft (engine model) - [Lycoming O-360-A1A](https://openairdocs.org/engine/lycoming-o-360-a1a): 601 aircraft (engine model) - [Lycoming O-360-A4M](https://openairdocs.org/engine/lycoming-o-360-a4m): 418 aircraft (engine model) - [Lycoming HIO-360 series](https://openairdocs.org/engine/lycoming-hio-360-series): 336 aircraft (engine model) - [Lycoming O-360-A1P](https://openairdocs.org/engine/lycoming-o-360-a1p): 301 aircraft (engine model) - [Lycoming O-540-F1B5](https://openairdocs.org/engine/lycoming-o-540-f1b5): 299 aircraft (engine model) All 283 models: https://openairdocs.org/ad/81-18-04-R2/models.md Every aircraft: https://openairdocs.org/ad/81-18-04-R2/aircraft.md ## Related documents - [AD 96-09-10](https://openairdocs.org/ad/96-09-10): Oil pump · Lycoming Engines AEIO-320-E1A, AEIO-320-E1B, AEIO-320-E2A and 334 more. Effective Jul 15, 1996. Supersedes this AD Its text cites no advisory circulars or STCs. ## NTSB investigations that cite this AD (2) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB NYC96LA117](https://openairdocs.org/ntsb/NYC96LA117), May 28, 1996: Cessna 177B (N19708), Chatham, MA, substantial damage. Probable cause: failure of the oil pump, which resulted in oil starvation and subsequent failure of the number two and four cylinder connecting rods. Also causal was inadequate maintenance by noncompliance with the… - [NTSB ATL82DA181](https://openairdocs.org/ntsb/ATL82DA181), Jun 30, 1982: Cessna 172 (N61791), Martinsburg, WV, substantial damage --- 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.