# AD 64-16-05: AC Pumps - Type: Airworthiness directive - Status: Current - Products: Lycoming Engines HIO-360-B1A, HIO-360-B1B, IO-320-B1A, IO-360-A1A, IO-360-B1B, IO-540-C1B5, O-320-A1A, O-320-A1B, O-320-A2A, O-320-A2B, O-320-A2C, O-320-A3A and 77 more - Effective: July 10, 1964 - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-765 - Registered aircraft: 61,844 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9FA1A81B298E50938625682A004CFDC9.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/64-16-05 ## The airworthiness directive 64-16-05 LYCOMING: Amdt. 765 Part 507 Federal Register July 10, 1964. Applies to O-320, O-340, O-360 and O-540 Series Engines Equipped With AC Fuel Pumps, AC 5623-467 (Lycoming P/N 74082), AC 5656880 (Lycoming P/N 74082) and AC 6440152 (Lycoming P/N 74798), and to IO-320-B1A, IO-360-A1A, -B1B, HIO-360-B1A, -B1B and IO-540-C-B5 Engines Equipped With AC Fuel Pumps, AC 5623466 (Lycoming P/N 73973) and AC 5656696 (Lycoming P/N 73870), Except for Recent Production Engines and Remanufactured Engines Listed in Lycoming Service Bulletin No. 298, Which Have Already Incorporated the Modification. Compliance required within 25 hours' time in service after the effective date of this AD unless already accomplished. To preclude the possibility of engine oil being drained overboard as a result of oil seal failure in AC light weight fuel pumps, modify AC pumps with part numbers listed herein in accordance with the instructions contained in Lycoming Service Bulletin No. 298. This directive effective July 10, 1964. ## Affected data sheets (7) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E-274](https://openairdocs.org/tcds/E-274): Lycoming Engines; names 32 of 60 models: O-320-C2B, O-320-E2B, O-320-B3B, O-320-C3A, O-320-C2A, O-320-D2A, O-320-A1B, O-320-A2A… - [TCDS E-295](https://openairdocs.org/tcds/E-295): Lycoming Engines; names 26 of 47 models: O-540-B2B5, O-540-A1D, O-540-A4B5, O-540-F1B5, O-540-A3D5, O-540-A4C5, O-540-F1A5, O-540-A1D5… - [TCDS E-286](https://openairdocs.org/tcds/E-286): Lycoming Engines; names 21 of 72 models: O-360-C1C, O-360-C1A, O-360-B1A, O-360-A1A, O-360-A3AD, O-360-B2A, O-360-A1D, O-360-A2E… - [TCDS 1E10](https://openairdocs.org/tcds/1E10): Lycoming Engines; names 4 of 89 models: HIO-360-B1B, IO-360-B1B, IO-360-A1A, HIO-360-B1A - [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 - [TCDS 1E12](https://openairdocs.org/tcds/1E12): Lycoming Engines; names 1 of 32 models: IO-320-B1A - [TCDS 1E4](https://openairdocs.org/tcds/1E4): Lycoming Engines; names 1 of 81 models: IO-540-C1B5 ## 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: 61,844 (0 by airframe model, 61,844 by engine model) - Makers: Piper 26,121, Cessna 14,468, Mooney 3,506, Beech 1,627, Robinson Helicopter 1,295, Grumman American Avn. 1,185, Bellanca 1,113, Maule 685, Champion 448, Aviat 423 Models with the most aircraft: - [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series): 27,057 aircraft (engine model) - [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series): 11,931 aircraft (engine model) - [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series): 6,174 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-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 0-360-A1D](https://openairdocs.org/engine/lycoming-0-360-a1d): 968 aircraft (engine model) - [Lycoming O-360-A1A](https://openairdocs.org/engine/lycoming-o-360-a1a): 601 aircraft (engine model) - [Lycoming HIO-360 series](https://openairdocs.org/engine/lycoming-hio-360-series): 336 aircraft (engine model) - [Lycoming O-540-F1B5](https://openairdocs.org/engine/lycoming-o-540-f1b5): 299 aircraft (engine model) - [Lycoming O-320 series](https://openairdocs.org/engine/lycoming-o-320-series): 256 aircraft (engine model) - [Lycoming IO-360 series](https://openairdocs.org/engine/lycoming-io-360-series): 217 aircraft (engine model) - [Lycoming IO-360-A1A](https://openairdocs.org/engine/lycoming-io-360-a1a): 196 aircraft (engine model) - [Lycoming O-320-A2B](https://openairdocs.org/engine/lycoming-o-320-a2b): 180 aircraft (engine model) - [Lycoming O-320-D1A](https://openairdocs.org/engine/lycoming-o-320-d1a): 116 aircraft (engine model) - [Lycoming O-320-E2A](https://openairdocs.org/engine/lycoming-o-320-e2a): 98 aircraft (engine model) - [Lycoming O-320-B2B](https://openairdocs.org/engine/lycoming-o-320-b2b): 92 aircraft (engine model) - [Lycoming O-360-A1D](https://openairdocs.org/engine/lycoming-o-360-a1d): 89 aircraft (engine model) - [Lycoming O-320-D2A](https://openairdocs.org/engine/lycoming-o-320-d2a): 72 aircraft (engine model) All 97 models: https://openairdocs.org/ad/64-16-05/models.md Every aircraft: https://openairdocs.org/ad/64-16-05/aircraft.md Its text cites no advisory circulars or STCs. --- 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.