TCM IGNITION SYSTEMS
TELEDYNE CONTINENTAL MOTORS Aircraft Products PO Box 90 Mobile Alabama 36601
SERVICE BULLETIN NO.634 TELEDYNE INDUSTRIES, INC. 1990
SUBJECT:
REASON FOR BULLETIN: EQUIPMENT AFFECTED:
Printed December 1990 Page 1 of 2 Engineering Portions are FAA Approved
Replacement Of P/N 10-357173 Breaker Assemblies Exhibiting Batch Code 0690 And P/N 10-357174 Breaker Assemblies Exhibiting Batch Code 4289 Through 1790 Or Subject Breakers P/N With. To Remove From Service Breaker Assemblies Which May Experience Contact Braze Joint Failure. Magneto Models: S4RN-20, S4RN-21, S4LN-20, S4LN-21, S6RN-21, S6LN-20, S6LN-21, S6LN-22, S6RN-23, S6LN-23, S6RN-25, S6LN-25. Magneto Part Numbers: 10-51360-25, -29, -37, -40, -41, -46, -54, -55; 1051365-32, -33, -34, -35, -39, -43, -44, -45, -46, -47, -54; 10-52350-20, -22, -23; 10-79020-6, -10, -16 Having New or Factory Overhauled Magneto Manufacturing (Serial) Numbers within the Range: J168901D(R) through G319099D(R) and Magneto Part Numbers: 10-51360-26, -27, -28; 10-5136540, -48; 10-52350-19 Having New or Factory Overhauled Manufacturing (Serial) Numbers Within the Range: B059001D(R) through J199099D(R) Field Replaced Breakers: Similar Part Number Magnetos to Above Listing with P/N 10-357173 or P/N 10-357174 Breaker Assemblies Field Replaced Since October 16, 1989. NOTE...Refer to SB 633 for Manufacturing (Serial) Number Code Information.
Maintenance (Spare) Parts Affected:
Detailed Instructions:
Breaker Assembly, P/N 10-357173 - Batch Codes 0690 (sixth week of 1990) and P/N 10-357174 Batch Codes 4289 (forty-second week of 1989) through 1790 (seventeenth week of 1990) ink marked on underside of the Breaker Assembly frame.
1. Spare Breaker Assemblies. Return for warranty all P/N 10-357173 Breaker Assemblies exhibiting Batch Code 0690, and 10-357174 Breaker Assemblies exhibiting Batch Code 4289 through 1790, or either of the subject P/N Breaker Assemblies with illegible Batch Code markings.
Compliance: Spares - immediately upon receipt of Bulletin. Units in Service - only those magnetos or breaker assemblies with 150 hours or less since installation, within next 5 hours of operation. General Information: Field Reports indicated subject parts may experience failure at braze joint of stationary Tungsten contact within first 150 hours of operation, resulting in loss of ignition from affected magneto.
2. Units in Service. Following engine manufacturer's published instructions, remove magneto from engine. Following procedures in TCM Ignition Systems Form X42002, S20/S-200 Series Magneto Service Manual, remove the affected Breaker Assembly from the magneto. Inspect the underside of the Breaker for ink stamping. Refer to Figures 1 & 2. NOTE...If Batch Codes are non-existent or illegible, replace the Breaker Assembly. Replace and adjust the new or acceptable Breaker Assembly in accordance to TCM Form X42002. Reinstall magneto on engine in accordance with engine manufacturer's instructions.
TCM IGNITION SYSTEMS SERVICE BULLETIN NO.634 Printed March 1990 Page 2 of 2 Engineering Portions are FAA Approved
Identification: Following compliance with Breaker Assembly inspection or replacement in a magneto, make an engine logbook entry indicating method of compliance. Parts Required: P/N 10-357173 or P/N 10-357174 Breaker Assembly as required. Special Tools Required:
FIGURE 1 P/N 10-357173-Batch Code 0690
Refer to S-20/S-200 Series Magneto Service Manual, Form X42002. Warranty Consideration: All affected equipment will be covered by the standard TCM Ignition Systems Warranty Policy, subject to its terms and conditions. Warranty claims may be filed through any TCM Ignition Systems Distributor. Up to 1.8 hours labor will be allowed per magneto installed on engine. Up to 1.0 hours labor will be allowed per magneto not installed on engine.
FIGURE 2 P/N 10-357174-Batch Codes 4289 through 1790
