# SDR USAA2011121500028

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 12, 2011
- Submitted: December 15, 2011
- Operation: Air carrier
- Aircraft: N430US
- Make and model: Boeing 737-4B7
- Registry model: [Boeing 737-4B7](https://openairdocs.org/model/boeing-737-4b7) (OpenAirDocs)
- Aircraft serial: 24552
- Aircraft time: 58,702 hours, 38,935 cycles
- System (JASC): [2230 · Auto Throttle System](https://openairdocs.org/jasc/2230)
- Part: Switch
- Part number: RAA21964
- Condition: Faulty
- Location: Autothrottle Sys
- Stage of operation: CR
- 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/USAA2011121500028

## Discrepancy

CREW REPORTED DURING LEVEL OFF AT CRUISE ALTITUDE, THE NR 1 THROTTLE DID NOT RETARD - STAYED AT CLIMB THRUST SETTING RESULTING IN A LARGE THRUST DIFFERENTIAL MAINTENANCE PLACED THE AUTOTHROTTLE SYSTEM ON MEL AND SUBSEQUENTLY REMOVED AND REPLACED THE NR 1 AUTOTHROTTLE TORQUE SWITCH PER AMM 22-31-91-004-008.  OPS CHECK OK PER AMM 22-31-00-715-056.  CLEARED/REMOVED AUTOTHROTTLE MEL.

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