# SDR UPS08553644

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 17, 2008
- Submitted: October 20, 2008
- Operation: Air carrier
- Aircraft: [N456UP](https://openairdocs.org/aircraft/N456UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 25477
- System (JASC): [2740 · Stabilizer Control System](https://openairdocs.org/jasc/2740)
- Part: Trim Switch
- Part number: 800000000016
- Part serial: 4043
- Condition: Inoperative
- Location: Cockpit
- Stage of operation: UK
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS08553644

## Discrepancy

DIVERSION - BOTH CONTROL WHEEL'S STAB TRIM SWITCHES INOP IN FLT.    NO FAULTS BALL ON SMMS PRESENT CONTINUED T/S STAB TRIM MSG APPEARS WHEN GOING TO A/P NOSEDOWN DIRECTION & AT HALF SPEED. STOPPED T/S AT START 3 BLOCK 26 D. R&R'D BRAKE PRESS SWITCH PER FM - NO HELP. R&R'D STAB TRIM LIMIT SWITCH & POSITION PER MM 27-48-01-4. REQ ADJ TEST. ALL CHECKS NORMAL PER MM 27-48-00-5.

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