SERVICE BULLETIN

Compliance Will Enhance Safety, Maintenance, or Economy of. Operation. SUBJECT: Two Wire Magneto ... Internet: www.coiltester.com. CATEGORY 3. SB663.
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TELEDYNE CONTINENTAL

®

IGNITION SYSTEMS

CATEGORY 3

SERVICE BULLETIN Compliance Will Enhance Safety, Maintenance, or Economy of Operation

SB663 FAA APPROVED

SUBJECT:

Two Wire Magneto Tachometer Breaker Contact Assembly P/N 10-400507

PURPOSE:

To advise of procedures to ensure isolation of tachometer circuit.

COMPLIANCE:

All affected magnetos must be inspected per this Service Bulletin whenever tachometer breaker contacts are installed or adjusted, and at intervals not to exceed 500 hours.

MODELS AFFECTED: Model Number: S4LN-21 S6LN-25 S4LN-204 S6LN-204 S4LSC-21T S6LSC-25T S4LSC-204T S6LSC-204T

Part Number: 10-51360-47 10-79020-11, 10-79020-17 10-163045-6 10-163050-12 10-500514-201, BL-500514-201 10-500556-203, BL-500556-203 10-600644-201, BL-600644-201 10-600646-201, BL-600644-201

BACKGROUND: Tachometer breaker assembly p/n 10-400507 (supersedes 10-361631) is designed to be electrically insulated from magneto ground when it is installed in the magneto. The following procedure is a method to determine the integrity of the isolation of the tachometer circuit. DETAILED INSTRUCTIONS: After replacement or adjustment of tachometer breaker, and at maintenance intervals not to exceed 500 hours: 1. If applicable, disconnect magneto tachometer wires from all airframe circuits in accordance with Airframe Manufacturer’s instructions. 2. Using Slaughter Model 1101 Dielectric Breakdown Tester* (or equivalent) set to 500 V, apply 500 V between each tachometer wire and ground. No indication of dielectric breakdown is permissible. 3. Replace all tachometer breaker assemblies that indicate any dielectric breakdown. 4. Reattach magneto tachometer wires to airframe wires in accordance with Airframe Manufacturer’s instructions. * Slaughter Model 1101 Dielectric Breakdown Tester available from: Slaughter Company, LLC P. O. Box 1805 Ardmore, OK 73402 Ph: 800-421-1921 Internet: www.coiltester.com ISSUED

REVISED

MO

DAY

YEAR

06

28

2002

MO

DAY

YEAR

PAGE NO REVISION TM

Teledyne Continental Motors, Inc. A Teledyne Technologies Company

P.O. Box 90 Mobile Alabama • 251-438-3411

© 2002 TELEDYNE TECHNOLOGIES INCORPORATED

1 of 1 SB 663