COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Lycoming Piston Engines AD/LYC/103 Slick Magneto Inspection 4/99 DM Applicability: Textron Lycoming O-540-B2B5, -B2C5, -E4B5, -E4C5, -G1A5, -G2A5, IO-540-K1A5, -K1B5 and -K1G5 reciprocating engines equipped with Slick Aircraft Products magneto Model Numbers 6251, 6252, 6255, 6351 and 6355. Note: These engines are known to be installed on, but not limited to the following aeroplanes: Manufacturer Aeroplane Model and/or Series Britten Norman BN-2A, -2A-2, -2A-3, -2A-6, -2A-9, -2A-20, -2A-21, 2A-26, -2A-27, -2A-MKIII, -2A-MKIII-2, -2A-MKIII-3, -2B-20, -2B-21, -2B-26 and -2B-27 Piper PA-25-235, PA-25-260, PA-32( )-260 and PA-32-300 Requirement: 1. For engines on which the service history of the magneto is not known or on which the magneto has greater than 250 hours time in service (TIS) since new, factory rebuilt or overhauled, on the effective date of this Directive, inspect the components of the magneto impulse coupling for the conditions listed in accordance with steps 1 through 7 of Textron Lycoming Mandatory Service Bulletin (MSB) No 537 dated 20 November 1998. Note: Textron Lycoming MSB No 537 dated 20 November 1998 contains Slick Service Bulletin No SB1-98 dated 26 August 1998. The steps referenced in the Textron MSB are the same steps referenced in the Slick Bulletin. 2. For engines on which the magneto has less than or equal to 250 hours TIS since new, factory rebuilt or overhauled, on the effective date of this Directive, inspect the components of the magneto impulse coupling for the conditions listed in accordance with steps 1 through 7 of Textron Lycoming Mandatory MSB No 537. 3. Remove the magneto impulse coupling from service and replace it with a serviceable coupling. Note: FAA AD 99-04-04 Amdt 39-11028 refers. Compliance: 1. Within 10 hours TIS from the effective date of this directive and thereafter at intervals not to exceed 250 hours TIS. 2. Either prior to accumulating 250 hours TIS since new, factory rebuilt or overhauled, or within 10 hours TIS from the effective date of this Directive, whichever comes later, and thereafter at intervals not to exceed 250 hours TIS. 3. Prior to the accumulation of 2 000 hours TIS since new. This Airworthiness Directive becomes effective on 24 February 1999. COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Background: Numerous reports have been received of failure of the impulse coupling pawl on Slick magnetos installed on Textron Lycoming IO-540 and O-540 engines. The impulse coupling failure has resulted in seizure of the engine.