CATEGORY 4

P.O. Box 90 MOBILE ALABAMA 36601 ... SERVICE INFORMATION LETTER .... or S-600 series magneto affected by A.D. 94-01-03 R1 was built January 4,.
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TELEDYNE CONTINENTAL

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IGNITION SYSTEMS

CATEGORY 5

SERVICE INFORMATION LETTER SIL646 Contains Useful Information Pertaining To Your Aircraft SUBJECT:

FAA APPROVED

HISTORY OF THE REQUIREMENT TO REPLACE MAGNETO COILS AND ROTATING MAGNETS.

This March, the Federal Aviation Administration issued Airworthiness Directive 94-01-03 that applies to Teledyne Continental Motors Ignition Systems Service Bulletin 637. The issuance of this A.D. has caused some confusion as to which magneto models and serial numbers are affected. To help understand which magnetos are affected and/or require inspection, some background history is required. In August of 1972, Bendix Corporation issued Service Bulletin 560 that required the replacement of certain part number coils and rotating magnets at overhaul in all new and remanufactured S-20, S-200, S-600 and S-1200 Series magnetos within specific serial number ranges. This requirement applies to each Type magneto included in each magneto Series designation. Reference the following table for magneto Series and their associated Type numbers. S-20 SERIES

S-200 SERIES

S-1200 SERIES

*S-600

S-20 SERIES

S-200 SERIES

S-1200 SERIES

*S-600

S4LN-20

S4LN-200

S4LN-1208

*S6RN-600

S6LN-25P

S6LN-201

S6LN-1227

----

S4RN-20

S4LSC-200

S4LN-1209

*S6RN-604

S6RN-25P

S6RN-201

S6RN-1227

----

S4LN-21

S4RN-201

S4RN-1209

----

S6LSC-25

S6LSC-201

S6LN-1251

----

S4RN-21

S4RSC-201

S4LN-1227

----

S4LN-204

S4RN-1227

----

S6RSC-25

S6RSC-201

S6RN-1251

----

S4LSC-21 S4RSC-21

S4LSC-204

S6LN-1201

----

S6LSC-25P

S6LN-204

S6LN-1255

----

S4LSC-21T

S4RSC-204

S6RN-1201

----

S6RSC-25P

S6RN-204

S6RN-1255

----

S6LN-20

S4LSC-204T

S6LN-1205

----

S6LSC-25T

S6LSC-204

S6LN-1258

----

S6LN-21

S4RN-205

S6RN-1205

----

* S6LN-22

S6RSC-204

S6RN-1258

----

S6RN-21

S4RSC-205

S6LN-1208

----

* S6RN-23

S6LSC-204P

S6LN-1259

----

S6LSC-21

S6LN-200

S6RN-1208

----

----

S6LSC-204T

S6RN-1259

----

S6RSC-21

S6RN-200

S6LN-1209

----

----

S6LN-205

S8LN-1208

----

S6LN-23

S6LSC-200

S6RN-1209

----

----

S6RN-205

S8LN-1209

----

----

S6LSC-205

S8LN-1258

----

----

S6RSC-205

S8LN-1259

----

S6LN-25

S6RSC-200

S6LN-1225

----

S6RN-25

S6LSC-200P

S6RN-1225

----

* - No Longer Produced

Additional Type numbers may be added as new magneto models are developed. For a detailed explanation of Type numbers, reference the applicable magneto System Support Manual.

MO 09

ISSUED DAY YEAR 14

94

MO

REVISED DAY YEAR

TELEDYNE CONTINENTAL MOTORS P.O. Box 90 MOBILE ALABAMA 36601 (205) 438-3411

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Soon thereafter, the F.A.A. issued A.D. 73-07-04 that required that the affected parts listed in Service Bulletin 560 be replaced upon the accumulation of 2000 hours on magnetos that had less than 1800 hours total time in service and within the next 200 hours on those with 1800 hours or more. Those with unknown time in service were considered to fall within the category of those that had accumulated 1800 hours or more. Compliance with A.D. 73-07-04 will be indicated by the letter "A" stamped on the magneto housing between the timing plug hole and harness outlet plate. Bendix Service Bulletin 560 was later revised to 560A. This revision included the addition of changes that did not affect the applicability or compliance times of the original Service Bulletin 560 issuance. Six years after the purchase of the Bendix Corporation light aircraft ignition systems product line, Teledyne Continental Motors issued Service Bulletin 637 which superseded 560A. This bulletin included three major changes: (1) Magneto serial number affectivity, (2) compliance at the next 100 hour, annual or progressive maintenance inspection, whichever comes first, and (3) the deletion of certain previously approved S-20, S-200 and S-1200 Series coils. In March of this year, the F.A.A. superseded A.D. 73-07-04 with A.D. 94-01-03 to remain consistent with the changes and requirements of Service Bulletin 637. An important detail to remember is that magnetos that have complied with A.D. 73-07-04 may be in compliance with A.D. 94-01-03, as long as the latest part number coil, (as listed in Service Bulletin 637) was installed at the time of compliance. The types of rotating magnets that were required to be replaced under the instructions listed in A.D. 73-07-04 and A.D. 94-01-03 are the same and therefore, did not change. None of the affected coils and rotating magnets that were required to be replaced by Service Bulletin 637 were available from Bendix or TCM after 1974. Also, any magneto with a TCM data plate would not be affected by A.D. 94-01-03. TCM Ignition Systems service bulletin MSB644 supersedes 637. This supersedure is intended to clarify magneto affectivity and reduce the number of "new" magnetos affected. This month, the F.A.A. issued A.D. 94-01-03 R1 to reflect the changes included in Service Bulletin MSB644. The latest "new" S-20, S-200 or S-600 series magneto affected by A.D. 94-01-03 R1 was built January 4, 1971. The latest "new" S-1200 series magneto was built December 31, 1974. The latest "remanufactured" magneto of any series was built December 31, 1978. All of these magnetos were built by Bendix Corporation, not TCM Ignition Systems. The need for releasing a service bulletin and A.D. with reduced compliance time stems from the lack of adherence to the required preventive maintenance to be performed on magnetos. In 1992, the National Transportation Safety Board recommended that the F.A.A. issue airworthiness directives requiring inspection and maintenance on all brands of magnetos, due to the number of accidents caused by magneto neglect. Teledyne Continental Ignition Systems Service Bulletin SB643 (which superseded 632A) provides the required maintenance intervals for all TCM and Bendix aircraft magnetos and related equipment. Ignition systems must be maintained in accordance with the manufacturer's instructions.

MO 09

ISSUED DAY YEAR 14

94

MO

REVISED DAY YEAR

TELEDYNE CONTINENTAL MOTORS P.O. Box 90 MOBILE ALABAMA 36601 (205) 438-3411

PAGE NO REVISION

2 of 2