# AD 93-10-02: Missing Cylinder Valve Retainer Key - Type: Airworthiness directive - Status: Current - Products: Continental Motors GTSIO-520-C, GTSIO-520-D, GTSIO-520-E, GTSIO-520-F, GTSIO-520-H, GTSIO-520-K, GTSIO-520-L, GTSIO-520-M, GTSIO-520-N, IO-360-A, IO-360-AB, IO-360-B and 171 more - Effective: August 12, 1993 - Superseded by: Nothing supersedes this AD - Product type: Engine - Amendment: 39-8603 - Docket: 93-ANE-28 - Registered aircraft: 64,143 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3DC6A596337CB7B2862568480057696D.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/93-10-02 ## The airworthiness directive 93-10-02 TELEDYNE CONTINENTAL MOTORS: Amendment 39-8603. Docket 93-ANE-28. Applicability: Teledyne Continental Motors (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 series reciprocating engines listed by serial number in TCM Mandatory Service Bulletin (MSB) No. 93-12, dated May 12, 1993, or that contain cylinder assemblies purchased from TCM between July 29, 1992, and March 30, 1993; installed on but not limited to: Aeronca Models 15AC and S15AC; American Champion (Bellanca) Models 7ACA and 402; Beagle Model 206S; Beech Models Debonaire, Bonanza, and Baron; Bellanca Models 14-19, 14-19-2, 14-19-3, 14-19-3A, 17-30, 17-31, and 17-31TC; Cessna Models 150, 170, 172, 180, 182, 185, 188, 205, 206, 207, 210, 303, 310, 320, 335, 336, 337, 340, 401, 402, 404, 414, 421, and T41; Aero Commander Models 200, 500, and 685; Champion Models Citabria and Lancer; Maule Models Bee Dee M-4, M-4, M-4C, M-4S, M-4T, M-4-210, M-4-210C, M-4-210S,M-4-210T, and M-5-210C; Mooney Models 231 and 252; Navion series; Piper Models Arrow, Seneca, and PA46-310P; and Taylorcraft Model F-19 aircraft. Compliance: Required prior to further flight, unless previously accomplished. To prevent an engine failure due to a missing cylinder valve retainer key, accomplish the following: (a) For engines that have less than 25 hours time in service (TIS), or unknown TIS, on the effective date of the AD since new, rebuild, or factory overhaul, visually inspect each cylinder to determine if both valve retainer keys are in place on each valve, and if the roto coil, if applicable, is properly positioned, in accordance with TCM MSB No. 93-12, dated May 12, 1993. NOTE: Certain TCM engine models do not incorporate roto coils in the valve assembly. (1) If a valve retainer key is missing, or if a roto coil, if applicable, is mispositioned, repair or replace the cylinder, as necessary, in accordance with the applicable TCM Overhaul Manual. (2) If the valve retainer keys are in place, and the roto coil, if applicable, is correctly positioned, return engine to service in accordance with TCM MSB No. 93-12, dated May 12, 1993. (b) For engines with individually installed new service or chrome plated cylinder assemblies purchased from TCM between July 29, 1992, and March 30, 1993, that have less than 25 hours TIS on the effective date of this AD since installation of any cylinder(s), visually inspect each new service or chrome plated cylinder, and repair or replace the cylinder, as necessary, in accordance with paragraph (a) of this AD. (c) Uninstalled cylinder assemblies purchased from TCM between July 29, 1992, and March 30, 1993, must be inspected and repaired, as necessary, in accordance with paragraph (a) of this AD prior to installation on an engine. (d) For engines that have 25 hours or more TIS on the effective date of this AD, since new, rebuild, or factory overhaul, no inspection is required.(e) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Atlanta Aircraft Certification Office. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Atlanta Aircraft Certification Office. NOTE: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Atlanta Aircraft Certification Office. (f) The inspections shall be done in accordance with the following service bulletin: Document No. Pages Revision Date TCM MSB No. 93-12 1-7 Original May 12, 1993 Total pages: 7. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Teledyne Continental Motors, P.O.Box 90, Mobile, AL 36601; telephone (205) 438-3411 ext. 305, fax (205) 438-3411 ext. 179. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (g) This amendment becomes effective August 12, 1993, to all persons except those persons to whom it was made immediately effective by priority letter AD 93-10-02, issued May 17, 1993, which contained the requirements of this amendment. ## Affected data sheets (15) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS E8CE](https://openairdocs.org/tcds/E8CE): Continental Aerospace Technologies, Inc.; names 31 of 31 models: TSIO-520-BB, TSIO-520-B, TSIO-520-P, TSIO-520-R, TSIO-520-AF, TSIO-520-M, TSIO-520-J, TSIO-520-A… - [TCDS E9CE](https://openairdocs.org/tcds/E9CE): Continental Aerospace Technologies, Inc.; names 28 of 28 models: TSIO-360-SB, TSIO-360-JB, TSIO-360-FB, TSIO-360-HB, TSIO-360-H, TSIO-360-NB, TSIO-360-GB, TSIO-360-E… - [TCDS E-273](https://openairdocs.org/tcds/E-273): Continental Aerospace Technologies, Inc.; names 21 of 21 models: O-470-G-CI, O-470-T, O-470-B-CI, O-470-N, O-470-R, IO-470-C, O-470-H, O-470-A… - [TCDS 3E1](https://openairdocs.org/tcds/3E1): Continental Aerospace Technologies, Inc.; names 18 of 19 models: IO-470-H, IO-470-D, IO-470-R, IO-470-J, IO-470-LO, IO-470-M, IO-470-L, IO-470-P… - [TCDS E5CE](https://openairdocs.org/tcds/E5CE): Continental Aerospace Technologies, Inc.; names 17 of 18 models: IO-520-NB, IO-520-BA, IO-520-A, IO-520-B, IO-520-P, IO-520-C, IO-520-L, IO-520-N… - [TCDS E1CE](https://openairdocs.org/tcds/E1CE): Continental Aerospace Technologies, Inc.; names 16 of 18 models: IO-360-A, IO-360-G, IO-360-B, IO-360-C, IO-360-ES, IO-360-H, IO-360-JB, IO-360-D… - [TCDS E3SO](https://openairdocs.org/tcds/E3SO): Continental Aerospace Technologies, Inc.; names 11 of 20 models: IO-550-F, IO-550-G, IO-550-L, IO-550-N, IO-550-B, IO-550-R, IO-550-P, IO-550-A… - [TCDS E7CE](https://openairdocs.org/tcds/E7CE): Continental Aerospace Technologies, Inc.; names 9 of 10 models: GTSIO-520-E, GTSIO-520-K, GTSIO-520-D, GTSIO-520-C, GTSIO-520-M, GTSIO-520-F, GTSIO-520-N, GTSIO-520-L… - [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 E5SO](https://openairdocs.org/tcds/E5SO): Continental Aerospace Technologies, Inc.; names 6 of 12 models: TSIO-550-C, TSIO-550-G, TSIO-550-E, TSIO-550-B, TSIO-550-A, TSIO-550-K - [TCDS E-252](https://openairdocs.org/tcds/E-252): Continental Aerospace Technologies, Inc.; names 5 of 15 models: O-200-A, O-200-C, O-200-B, O-200-X, O-200-D - [TCDS E-253](https://openairdocs.org/tcds/E-253): Continental Aerospace Technologies, Inc.; names 5 of 8 models: O-300-A, O-300-D, O-300-C, O-300-B, O-300-E - [TCDS 3E3](https://openairdocs.org/tcds/3E3): Continental Aerospace Technologies, Inc.; names 3 of 3 models: TSIO-470-C, TSIO-470-B, TSIO-470-D - [TCDS E4SO](https://openairdocs.org/tcds/E4SO): Continental Aerospace Technologies, Inc.; names 3 of 3 models: TSIOL-550-A, TSIOL-550-B, TSIOL-550-C - [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: 64,143 (0 by airframe model, 64,143 by engine model) - Makers: Cessna 38,431, Beech 10,133, Cirrus Design 7,519, Piper 1,553, Mooney 1,266, Raytheon 597, Bellanca 584, Columbia Aircraft Mfg 254, Lancair 250, Hawker Beechcraft 210 Models with the most aircraft: - [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series): 12,779 aircraft (engine model) - [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series): 9,486 aircraft (engine model) - [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series): 8,790 aircraft (engine model) - [Continental 0-300 series](https://openairdocs.org/engine/continental-0-300-series): 6,622 aircraft (engine model) - [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series): 4,499 aircraft (engine model) - [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series): 4,064 aircraft (engine model) - [Continental IO-550 series](https://openairdocs.org/engine/continental-io-550-series): 3,077 aircraft (engine model) - [Continental TSIO-550-K](https://openairdocs.org/engine/continental-tsio-550-k): 2,799 aircraft (engine model) - [Continental IO-550-N](https://openairdocs.org/engine/continental-io-550-n): 2,772 aircraft (engine model) - [Continental TSIO-360 series](https://openairdocs.org/engine/continental-tsio-360-series): 1,900 aircraft (engine model) - [Continental IO-360 series](https://openairdocs.org/engine/continental-io-360-series): 1,885 aircraft (engine model) - [Continental TSIO-550-C](https://openairdocs.org/engine/continental-tsio-550-c): 480 aircraft (engine model) - [Continental IO-360-ES](https://openairdocs.org/engine/continental-io-360-es): 401 aircraft (engine model) - [Continental GTSIO-520-C](https://openairdocs.org/engine/continental-gtsio-520-c): 387 aircraft (engine model) - [Continental TSIO-550 series](https://openairdocs.org/engine/continental-tsio-550-series): 382 aircraft (engine model) - [Continental IO-550-B](https://openairdocs.org/engine/continental-io-550-b): 373 aircraft (engine model) - [Continental O-200 series](https://openairdocs.org/engine/continental-o-200-series): 329 aircraft (engine model) - [Continental O-200A](https://openairdocs.org/engine/continental-o-200a): 295 aircraft (engine model) - [Continental IO-470 series](https://openairdocs.org/engine/continental-io-470-series): 225 aircraft (engine model) - [Continental O-200-D](https://openairdocs.org/engine/continental-o-200-d): 210 aircraft (engine model) All 160 models: https://openairdocs.org/ad/93-10-02/models.md Every aircraft: https://openairdocs.org/ad/93-10-02/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.