AD/CON/81 Amdt 1 - Unison Industries (Slick) Magnetos

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Legislation au F2006B08657 Not in force Legislative Instrument

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AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive AD/CON/81 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

 

Teledyne Continental Motors Piston Engines

 

AD/CON/81

Amdt 1


Unison Industries (Slick) Magnetos 9/2002

DM

 

Applicability: Teledyne Continental Motors (TCM) C-125, C145, O-300 series, IO-360 series, TSIO-360 series, and LTSIO-520-AE series reciprocating engines with Unison Industries (Slick) Magnetos, models 6314, 6324, and 6364, with magneto serial numbers of 99110001 through 99129999 inclusive.

 

Note 1: These engines are used on, but not limited to, Cessna 170, 170A, 170B, 172, 172A through 172H, 172XP, 336, 337, and T303, Beagle B242-C, Cirrus SR20 and SR22, Globe Swift GC-1A and GC-1B, Maule M4, Piper PA-28R-201T and PA-34, and Reims (Cessna) FA172, F337, and FR172.

 

Note 2: A cross-reference for part numbers (P/N's) for Unison magneto model 6314 (TCM P/N 653271), model 6324 (TCM P/N 653292), and model 6364 (TCM P/N

649696) can be found in TCM Mandatory Service Bulletin 00-6A, dated June 8, 2000.

 

Note 3: The magneto serial number (S/N) 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 31 October 1999, it is likely that a suspect magneto is not installed on the engine.

Requirement: 1. If not accomplished in accordance with the original issue of this Directive - Replace any magneto that has a S/N of 99110001 through 99129999, inclusive, with a magneto that does not have a serial number in that range.

 

2.    Inspect each removed magneto to verify that the impulse coupling stop pin is present. If the pin is missing, accomplish the following:

 

a.    For C-125, C145, O-300, IO-360 and TSIO-360 engines:

 

  1. 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.

 

Teledyne Continental Motors Piston Engines

 

AD/CON/81 Amdt 1 (continued)

 

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.

b.    For LTSIO-520-AE series engines:

 

  1. 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 aeroplane, 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 crank case 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.

3.    Unison Industries (Slick) magnetos, model 6314, 6324, or 6364 that have a S/N of 99110001 through 99129999 inclusive, may not be installed on any engine.

Note 4: FAA Emergency AD 2000-11-51 and AD 2002-13-04 Amdt 39-12792 refer.

 

Compliance: For Requirement 1 - Within ten hours time in service from the effective date of this Amendment.

 

For Requirement 2 - Before further flight after the magneto is removed from the engine.

For Requirement 3 - As of the effective date of this Amendment.

 

Teledyne Continental Motors Piston Engines

 

AD/CON/81 Amdt 1 (continued)

 

This Amendment becomes effective on 12 July 2002.

 

Background: The Federal Aviation Administration (FAA) received reports of engine failures on certain Teledyne Continental Motors (TCM) reciprocating engines. On 26 April 2000, the FAA was notified of an in- flight engine failure in a Cirrus SR20 aeroplane with a TCM IO-360 engine. The FAA also received two reports of engine failures on the ground. The FAA determined that 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 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 aeroplane.

Since an unsafe condition has been identified that is likely to exist or develop on other engines of this same type design, this original issue of this Directive required replacement of the magneto if it falls within the specified serial number range; and, if it is replaced, an inspection of the ma gneto to verify that the stop pin is still in place. Additionally, if the stop pin is not in place, the Directive required an inspection of the engine gear train.

 

This amendment is issued following the FAA identifying two further engines series that may be affected. The amendment also includes two new explanatory notes identifying known aeroplanes with the affected engine series and providing a cross reference of Unison and TCM magneto P/Ns.

Note 5: The Direct Mail version of this amendment has only been forwarded to the Certificate of Registration holder of aeroplanes with C-125 and C145 engines fitted.

The original issue of this Airworthiness Directive became effective on 14 June 2000.


 

 

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safe ty Authority 3 July 2002

 

 

 


The above AD is notified in the Commonwealth of Australia Gazette on 10 July 2002.

Overview

The Civil Aviation Safety Authority (CASA) issued Airworthiness Directive AD/CON/81 Amendment 1 in 2002 to address an unsafe condition identified in certain Teledyne Continental Motors reciprocating engines, specifically those with Unison Industries (Slick) Magnetos within specified serial numbers. This amendment was introduced to mitigate the risk of engine failure due to the migration of the magneto impulse coupling stop pin into the engine gear train, which could lead to severe damage and loss of control. The enactment of this directive was necessary following reports of engine failures both in-flight and on the ground, which were attributed to a manufacturing defect in the affected magnetos. The objective of this directive is to ensure the safety of aircraft equipped with these engines by mandating the replacement of affected magnetos and conducting thorough inspections of the engine gear trains to prevent further incidents. This action is required to be taken within specific timeframes as outlined in the directive to ensure compliance and maintain airworthiness standards.

Scope and Application

The Airworthiness Directive AD/CON/81, issued under the authority of the Civil Aviation Safety Regulations 1998, applies specifically to Teledyne Continental Motors (TCM) reciprocating engines of the C-125, C145, O-300 series, IO-360 series, TSIO-360 series, and LTSIO-520-AE series, equipped with Unison Industries (Slick) Magnetos, models 6314, 6324, and 6364, within the serial number range of 99110001 through 99129999 inclusive. The directive mandates the replacement of any affected magnetos and necessitates inspections and repairs to the engine gear train if the impulse coupling stop pin is missing, to prevent potential engine failure and loss of control. This directive applies to all aircraft operators within Australia who are in possession of the specified engines and magnetos. The requirements must be complied with within ten hours from the directive's effective date, with further inspections mandated before further flight after the magneto is removed. The directive is effective from 12 July 2002, and any amendments or extensions are to be issued under the same regulatory framework.

Key Provisions

The key operative sections of the Airworthiness Directive AD/CON/81 Amendment 1 specify the requirements and actions that must be taken regarding certain Teledyne Continental Motors piston engines with Unison Industries (Slick) Magnetos. The main requirement (section 1) mandates the replacement of any magnetos with serial numbers in the range 99110001 through 99129999 inclusive, with ones outside this range. If the removed magneto's impulse coupling stop pin is missing, further inspection and possible repair or replacement of engine components are required (section 2). Additionally, magnetos with the specified serial numbers must not be installed on any engine (section 3). The obligations imposed by the Act on the parties governed by it include ensuring that any affected magnetos are replaced and that inspections are conducted if the stop pin is missing. This involves detailed inspection procedures and potential repairs or replacements of various engine components such as the accessory case, crankcase, and gear teeth. Operators of the affected aircraft must also ensure that magnetos with the specified serial numbers are not installed on their engines. Failure to comply with the provisions of this Airworthiness Directive could result in significant safety risks, including engine failure and potential loss of control of the aircraft. Although the Act does not explicitly state penalties for non-compliance, such failure could lead to enforcement actions by the Civil Aviation Safety Authority (CASA) under other relevant aviation regulations, which may include fines, suspension of certificates, or other regulatory actions. The severity of the consequences underscores the importance of adhering to the requirements outlined in the Directive.

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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.