# SDR AALA202512161041

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 13, 2025
- Submitted: December 16, 2025
- Operation: Air carrier
- Aircraft: [N914NN](https://openairdocs.org/aircraft/N914NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31161
- Aircraft time: 37,732 hours, 16,508 cycles
- System (JASC): [2751 · Trailing Flap Position Indicating System](https://openairdocs.org/jasc/2751)
- Part: Sensor
- Condition: Failed
- Location: Zone 500
- Stage of operation: AP
- How discovered: O
- Nature of condition: J, F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202512161041

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: ENROUTE SHORTLY AFTER TRIMMING THE AIRCRAFT, THE YOKE WAS TILTED RIGHT AND REQUIRED RETRIMMING AGAIN. SHORTLY AFTER THIS THE CREW NOTICED A FLAP ASYMMETRY.  FLAP HANDLE UP, FLAP INDICATOR WAS SPLIT BETWEEN UP AND 1. RIGHT FLAP LOWER THAN LEFT. AIRCRAFT DECLARED EMERGENCY AND LANDED SAFELY AT ORD. REMOVED AND REPLACED NUMBER 7 FLAP DRIVE SKEW SENSOR, PER AMM 27-59-01, OPERATIONAL CHECK GOOD, ALL LEVER, FLAP, AND SKEW POSITIONS IN RANGE PER AMM 27-59-00-730-801. NO FAULTS FOUND DURING SYSTEM TEST.

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