# SDR 96ZZZX6160

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 16, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N749CA](https://openairdocs.org/aircraft/N749CA), registered now
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Aircraft serial: 421C1239
- Engine: Cont GTSIO520N
- System (JASC): [8540 · Reciprocating Engine Rear Section](https://openairdocs.org/jasc/8540)
- Part: Drive Adapter
- Part number: 643259AZ
- Condition: Worn
- Location: Starter Drv End
- Part time: 3,707 hours
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX6160

## Discrepancy

STARTER DRIVE GEAR WEAR UNACCEPTABLE IAW TELEDYNE CONTINENTAL CSB 94-4 EVEN THOUGH THE SERVICE KIT REQUIRED BY TCM CSB 94-4 HAD BEEN PREVIOUSLY INSTALLED AT THE ENGINE OVERHAUL.  SUSPECT CAUSE:  CSB 94-4 MAY NOT BE SUFFICIENT.  SUBMITTER RECOMMENDS FLEET DATA BE EXAMINED TO DETERMINE NUMBER OF OCCURRENCES.

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