# SDR USAA2011122200006

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 19, 2011
- Submitted: February 29, 2012
- 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: 58,753 hours, 38,966 cycles
- System (JASC): [2230 · Auto Throttle System](https://openairdocs.org/jasc/2230)
- Part: Mechanism
- Part number: 721RAA2
- Part serial: 1823
- Condition: Faulty
- Location: Autothrottle Sys
- Part time: 58,805 hours, 38,998 cycles
- 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/USAA2011122200006

## Discrepancy

ON LEVEL OFF FROM CLIMBS, BOTH LOW ALTITUDE AND HIGH ALTITUDE, THE NR 1 THROTTLE REMAINED AT CLIMB THRUST CAUSING A LARGE SPLIT WITH NR 2 THROTTLE AND A/T DISCONNECTED.  FLIGHT CONTINUED ONTO DESTINATION AND LANDED WITHOUT INCIDENT AT FLL.  MAINTENANCE REMOVED AND REPLACED THE NR 1 AUTOTHROTTLE SERVO/TORQUE SWITCH MECHANISM PER AMM 76-11-03.  PERFORMED SATISFACTORY OPS CHECK OF AUTOTHROTTLE SYSTEM PER AMM 22-31-00.  NO FAULTS.

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