# AD 2000-11-51: Magnetos - Type: Emergency airworthiness directive - Status: Historical - Products: Teledyne Continental Motors IO-360 Series (all), LTSIO-520-AE, O-300-A, O-300-B, O-300-C, O-300-D, O-300-E, TSIO-360 Series (all), IO-360 Series (all), LTSIO-520-AE, O-300-A, O-300-B and 12 more - Issued: June 7, 2000 - Issued as: Emergency AD - Superseded by: [AD 2002-13-04](https://openairdocs.org/ad/2002-13-04) - Product type: Engine - Docket: 2000-NE-19-AD - Registered aircraft: 10,469 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8A41427EBDD19E6D86256CCB005D5C1D.0001 - DRS record last changed: August 7, 2025 - Page: https://openairdocs.org/ad/2000-11-51 ## The airworthiness directive AIRWORTHINESS DIRECTIVES EMERGENCY RULES: 2000-11-51 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 2000-NE-19-AD AMENDMENT: AD NUMBER: 2000-11-51 SUBJECT HEADING: Teledyne Continental Motors (TCM) Model O-300 series, IO-360 series, TSIO-360 series, and LTSIO-520-AE reciprocating engines. ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: Michael Downs, Aerospace Engineer, Chicago Aircraft Certification Office, FAA, 2300 East Devon Avenue, Des Plaines, IL, 60018; telephone (847) 294-7870, fax (847) 294-7834. SUPPLEMENTARY INFORMATION: DATE: June 7, 2000 2000-11-51 Emergency distribution is required. Send to all U.S. owners and operators of Teledyne Continental Motors O-300, IO-360, TSIO-360, and LTSIO-520-AE series reciprocating engines. The Federal Aviation Administration (FAA) has received reports of engine failures on certain Teledyne Continental Motors (TCM) reciprocating engines. On April 26, 2000, the FAA was notified of an in-flight engine failure in a Cirrus SR20 airplane with a TCM IO-360 engine. The FAA has also received two reports of engine failures on the ground. The FAA has determined that the migration of the magneto impulse coupling stop pin out of the magneto frame and into the gear train of the engine caused damage to the gear train and, ultimately, engine failure. The specific cause for the migration of the impulse coupling stop pin is still undetermined, but data indicate that it is due to a manufacturing problem that is limited to a specific range of magneto models and serial numbers that were produced during the months of November 1999 and December 1999. This condition, if not corrected, could result in engine failure and subsequent loss of control of the airplane. Manufacturer's Service Information The FAA has reviewed and approved the technical contents of TCM Mandatory Service Bulletin (MSB) 00-6, dated May 3, 2000. MSB 00-6 provides cross-referenced part numbers (PN's) for Unison magneto model 6314 (TCM PN 653271) and model 6324 (TCM PN 653292). The MSB does not provide a cross-reference P/N for the model 6364 magneto. Requirements of This AD Since an unsafe condition has been identified that is likely to exist or develop on other engines of this same type design, this AD requires, within 10 flight hours after receipt of this AD, replacement of the magneto if it falls within the specified serial number range; and, if it is replaced, an inspection of the magneto to verify that the stop pin is still in place; and, if the stop pin is not in place, an inspection of the engine gear train. This rule is issued under 49 U.S.C. Section 44701 (formerly section 601 of the Federal Aviation Act of 1958) pursuant to the authority delegated to me by the Administrator, and is effective immediately upon receipt of this emergency AD. REGULATORY TEXT: 2000-11-51 Teledyne Continental Motors: Docket No. 2000-NE-19-AD. Applicability: This Airworthiness Directive (AD) is applicable to Teledyne Continental Motors (TCM) O- 300 series, IO-360 series, TSIO-360 series, and LTSIO-520-AE reciprocating engines with Unison Industries (Slick) Magnetos, models 6314, 6324, and 6364, with magneto serial numbers of 99110001 through 99129999 inclusive. Note 1: The magneto serial number (SN) can be found in logbooks or other maintenance records. If the magneto was installed, or if the engine was assembled new, rebuilt, or overhauled before October 31, 1999, it is likely that a suspect magneto is not installed on the engine. Note 2: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (d) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it. Compliance: Compliance with the following instructions is required within 10 flight hours after the receipt of this Emergency AD, unless they have already been completed. To prevent engine failure and loss of control of the airplane due to migration of the magneto impulse coupling stop pin out of the magneto frame and into the gear train of the engine, do the following: Replacement of Magneto (a) Replace any magneto that has an SN of 99110001 through 99129999, inclusive, with a magneto that does not have a serial number in that range. (b) Inspect each removed magneto to verify that the impulse coupling stop pin is present. If the pin is missing, do the following: (1) For 0-300, IO-360, TSIO-360 and TSIO-360 engines, do the following: (i) Remove magnetos, alternator or generator, and starter adapter from the accessory case. (ii) Remove the accessory case from the crankcase and oil sump. (iii) Visually inspect the entire engine gear train for damaged or broken gears and gear teeth. (iv) Inspect visible portions of the engine crankcase and accessory case for damage due to the stop pin becoming lodged between the engine gear train and the crankcase or accessory case. (v) If the accessory case is damaged, repair or replace the accessory case. (vi) If the engine crankcase is damaged, disassemble the engine, and repair or replace the crankcase. (vii) Inspect the oil pump drive gear teeth and inner cam gear teeth for damage. Replace any engine drive train component that has been damaged. (viii) Replace any damaged gear, and magnaflux the mating gears using the applicable engine overhaul manual. (2) For LTSIO-520-AE series engines, do the following: (i) Remove the starter adapter, fuel pump, vacuum pumps, accessory drive pads, and both magnetos. (ii) Visually inspect the entire engine gear train for damaged or broken gears and gear teeth. (iii) If any damage has occurred, remove the engine from the airplane, disassemble the engine, and inspect it for damage. If any damage is found, repair as necessary. (iv) Replace any damaged gear, and magnaflux the mating gears using the applicable engine overhaul manual. (v) Inspect the interior portions of the engine crankcase for damage due to the stop pin becoming lodged between the gear train and the crankcase. If the crankcase is damaged, repair or replace the crankcase. (c) After receiving this AD, do not install any Unison Industries magnetos, model 6314, 6324, or 6364 that have a SN of 99110001 through 99129999 inclusive, on any engine. Note 3: Copies of the applicable service information may be obtained from Teledyne Continental Motors, PO Box 90, Mobile, AL 36601; telephone toll free 1-888-200-7565, or on the TCM internet site "www.tcmlink.com." (d) 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, Chicago Aircraft Certification Office (CHIACO). Operators shall submit their requests through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, CHIACO. Note 4: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the CHIACO. (e) Emergency AD 2000-11-51, issued June 7, 2000, becomes effective upon receipt. FOOTER: Issued in Burlington, Massachusetts on June 7, 2000. David A. Downey, Assistant Manager, Engine and Propeller Directorate, Aircraft Certification Service. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [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 E8CE](https://openairdocs.org/tcds/E8CE): Continental Aerospace Technologies, Inc.; names 1 of 31 models: LTSIO-520-AE ## 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: 10,469 (0 by airframe model, 10,469 by engine model) - Makers: Cessna 7,834, Piper 1,190, Mooney 674, Cirrus Design 302, Maule 181, Globe 47, Aero Commander 14, Beech 14, Temco 12, Aeronca 8 Models with the most aircraft: - [Continental 0-300 series](https://openairdocs.org/engine/continental-0-300-series): 6,622 aircraft (engine model) - [Continental TSIO-360 series](https://openairdocs.org/engine/continental-tsio-360-series): 1,907 aircraft (engine model) - [Continental IO-360 series](https://openairdocs.org/engine/continental-io-360-series): 1,885 aircraft (engine model) - [Continental 0-300-D](https://openairdocs.org/engine/continental-0-300-d): 31 aircraft (engine model) - [Continental 0-300-A](https://openairdocs.org/engine/continental-0-300-a): 15 aircraft (engine model) - [Continental 0-300-C](https://openairdocs.org/engine/continental-0-300-c): 4 aircraft (engine model) - [Rolls-Royce 0-300 series](https://openairdocs.org/engine/rolls-royce-0-300-series): 3 aircraft (engine model) - [Continental 0-300-B](https://openairdocs.org/engine/continental-0-300-b): 2 aircraft (engine model) All 10 models: https://openairdocs.org/ad/2000-11-51/models.md Every aircraft: https://openairdocs.org/ad/2000-11-51/aircraft.md ## Related documents - [AD 2002-13-04](https://openairdocs.org/ad/2002-13-04) (historical): Magneto impulse coupling stop pin ยท Teledyne Continental Motors C-125-1, C-125-2, C145-2 and 48 more. Effective Jul 12, 2002. Supersedes this AD 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.