# AD 56-06-01: Piston Pin Assembly - Type: Airworthiness directive - Status: Current - Products: Continental Motors E165-2, E165-3, E165-4, E185-1, E185-10, E185-11, E185-2, E185-3, E185-5, E185-8, E185-9, E225-2 and 32 more - Superseded by: Nothing supersedes this AD - Product type: Engine - Registered aircraft: 15,141 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6AE2425B8750014F8625682C006AB9EE.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/56-06-01 ## The airworthiness directive 56-06-01 CONTINENTAL: Applies to O-470 Series and E Series Engine Serial Numbers Below Excepting Any Remanufactured Engine Shipped From Continental Motors Corp. After May 1, 1955, and Engine Serial Numbers Designated "Exceptions." Compliance required as soon as possible but not later than July 1, 1956. To prevent serious engine damage in flight, the following must be accomplished: 1. Replace present piston pin assembly with piston pin assembly P/N 539467 in the following serially numbered engines: Engine Model O-470-A, Serial Nos. 41258 to 41679, 40015-2-A, 40021-2-A, 40028-2-A, 40045-2-A, 40054-2- A, 40074-3-A, 40110-3-A, 40125-3-A, 40154-3-A, 40168-3-A, 40176-3-A, 40177-3-A, 40203-3-A, 40204-3-A, 40242-3-A, 40264-3-A, 40267-3-A, 40293-3-A, 40334-3-A, 40371-3-A, 40418-3-A, 40424-3-A, 40438-3-A, 40444-3- A, 40485-3-A, 40494-3-A, 40567-3-A, 40579-3-A, 40581-3-A, 40601-3-A, 40619-3-A, 40647-3-A, 40651-3-A, 41008-3-A, 41025-3-A, 41032-3-A, 41033-3-A, 41038-3-A, 41039-3-A, 41068-3-A, 41094-3-A, 41109-4-A, 41175-4- A, 41181-4-A, 41187-4-A, 41189-4-A, 41196-4-A, 41251-4-A, 41254-4-A. Engine Model O-470-B, Serial Nos. 50001 to 50256. Exceptions - 50189, 50241, 50245, 50246, 50247, 50250, 50251, 50252. Engine Model O-470-J, Serial Nos. 45001 to 45533. Exceptions - 45520, 45521, 45525, 45529. Engine Models E-225-4, E-225-8, Serial Nos. 30163 to 30715. Engine Models E-185-8, E-185-11, Serial Nos. 22200 to 22269. Engine Model E-185-9, Serial Nos. 6128 to 6135. In addition, replace piston pin assembly, P/N 535145, with piston pin assembly, P/N 539467, in any O-470 or E Series engine that was overhauled in the field and in which it is known that P/N 535145 was installed at time of overhaul. (Continental Motors Corp. Service Bulletin No. M56-2, Supplement No. 1, dated March 12, 1956, further discusses this subject.) 2. Replace present oil pump gear assembly with oil pump gear assembly P/N 539525 in the following serially numbered engines: Engine Model O-470-B, Serial Nos. 50076 to 50256. Exceptions - 50189, 50241, 50245, 50246, 50247, 50250, 50251, 50252. Engine Model O-470-J, Serial Nos. 45001 to 45533. Exceptions - 45447, 45448, 45456, 45457, 45462, 45463, 45466, 45468, 45473, 45474, 45481, 45484, 45489, 45491, 45494, 45495, 45500, 45503, through 45514, 45516, 45519, 45520, 45522, 45523, 45525, 45526, 45528, 45529, 45532. 3. Replace present exhaust valve with exhaust valve P/N 539449 in the following serially numbered engines: Engine Model O-470-A, Serial Nos. 40001 to 40673. Engine Model O-470-A, Serial Nos. 41001 to 41679. Engine Model O-470-J, Serial Nos. 45001 to 45489. Exception - 45487. (Continental Motors Corp. Service Bulletin M56-2, dated February 14, 1956, further discusses this subject and offers special discounts for replacement parts ordered prior to July 1, 1956, from bona fide Continental aircraft engine spare parts distributors.) ## Affected data sheets (5) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E-273](https://openairdocs.org/tcds/E-273): Continental Aerospace Technologies, Inc.; names 19 of 21 models: O-470-G-CI, O-470-T, O-470-B-CI, O-470-N, O-470-R, O-470-H, O-470-A, O-470-E… - [TCDS E-246](https://openairdocs.org/tcds/E-246): Continental Aerospace Technologies, Inc.; names 11 of 11 models: E185-3, E185-1, E185-2, E165-2, E165-3, E185-11, E185-9, E185-10… - [TCDS E-269](https://openairdocs.org/tcds/E-269): Continental Aerospace Technologies, Inc.; names 8 of 8 models: O-470-11, O-470-15, O-470-11B-CI, O-470-13, O-470-11-CI, O-470-11B, O-470-4, O-470-13A - [TCDS E-267](https://openairdocs.org/tcds/E-267): Continental Aerospace Technologies, Inc.; names 4 of 4 models: E225-8, E225-9, E225-4, E225-2 - [TCDS E-281](https://openairdocs.org/tcds/E-281): Continental Aerospace Technologies, Inc.; names 1 of 2 models: O-470-2 ## 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: 15,141 (0 by airframe model, 15,141 by engine model) - Makers: Cessna 12,354, Beech 1,973, Ryan 263, North American 226, Navion 100, Bellanca 49, Luscombe 23, Stinson 15, Cessna Ector 14, Downer 14 Models with the most aircraft: - [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series): 12,779 aircraft (engine model) - [Continental E185 series](https://openairdocs.org/engine/continental-e185-series): 1,108 aircraft (engine model) - [Continental E225 series](https://openairdocs.org/engine/continental-e225-series): 979 aircraft (engine model) - [Continental O-470R](https://openairdocs.org/engine/continental-o-470r): 107 aircraft (engine model) - [Continental O-470-U](https://openairdocs.org/engine/continental-o-470-u): 56 aircraft (engine model) - [Continental O-470-S](https://openairdocs.org/engine/continental-o-470-s): 22 aircraft (engine model) - [Continental O-470-L](https://openairdocs.org/engine/continental-o-470-l): 19 aircraft (engine model) - [Continental O-470-K](https://openairdocs.org/engine/continental-o-470-k): 13 aircraft (engine model) - [Continental E165 series](https://openairdocs.org/engine/continental-e165-series): 8 aircraft (engine model) - [Continental E225-4](https://openairdocs.org/engine/continental-e225-4): 7 aircraft (engine model) - [Continental E225-8](https://openairdocs.org/engine/continental-e225-8): 7 aircraft (engine model) - [Continental O-470-J](https://openairdocs.org/engine/continental-o-470-j): 6 aircraft (engine model) - [Continental O-470-A](https://openairdocs.org/engine/continental-o-470-a): 5 aircraft (engine model) - [Continental 0-470-11](https://openairdocs.org/engine/continental-0-470-11): 4 aircraft (engine model) - [Continental O-470-M](https://openairdocs.org/engine/continental-o-470-m): 4 aircraft (engine model) - [Continental E185-1](https://openairdocs.org/engine/continental-e185-1): 3 aircraft (engine model) - [Continental O-470-G](https://openairdocs.org/engine/continental-o-470-g): 3 aircraft (engine model) - [Continental O-470-13A](https://openairdocs.org/engine/continental-o-470-13a): 3 aircraft (engine model) - [Continental 0-470-4](https://openairdocs.org/engine/continental-0-470-4): 2 aircraft (engine model) - [Continental 0-470-15](https://openairdocs.org/engine/continental-0-470-15): 2 aircraft (engine model) All 24 models: https://openairdocs.org/ad/56-06-01/models.md Every aircraft: https://openairdocs.org/ad/56-06-01/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.