# SDR 2002FA0000152

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 31, 2002
- Submitted: January 31, 2002
- Operation: General aviation
- Aircraft: N24442
- Make and model: Cessna 172R
- Registry model: [Cessna 172R](https://openairdocs.org/model/cessna-172r) (OpenAirDocs)
- Aircraft serial: 17280862
- Aircraft time: 474 hours
- Engine: Lyc IO360L2A
- Engine time: 474 hours
- System (JASC): [2731 · Elevator Tab Control System](https://openairdocs.org/jasc/2731)
- Part: Pin
- Condition: Sheared
- Location: Elevtor Trim
- Part time: 474 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002FA0000152

## Discrepancy

WHILE REMOVING THE TRIM TAB ACTUATOR FOR SERVICE, BOTH GROOVE-PINS  (P/N 3/32X.38TYPE3)  WHICH ATTACH THE ROLL CHAIN SPROCKET, (P/N 0310332-0)  TO THE SCREW-INTERNAL THREADS (P/N 1260049-1) OF THE TRIM TAB ACTUATOR WERE FOUND TO HAVE SHEARED. THIS ALLOWED THE SPROCKET TO BE SLIPPED OFF BY HAND. ONLY FRICTION BETWEEN THE SPROCKET AND THE SCREW-INTERNAL THREADS WAS ENABLING THE TRIM TAB TO BE MOVED.

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