# SDR AALA202512163273

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 14, 2025
- Submitted: December 16, 2025
- Operation: Air carrier
- Aircraft: [N331TK](https://openairdocs.org/aircraft/N331TK), registered now
- Make and model: Boeing 737-8
- Registry model: [Boeing 737-8](https://openairdocs.org/model/boeing-737-8) (OpenAirDocs)
- Aircraft serial: 68103
- Aircraft time: 7,387 hours, 2,854 cycles
- System (JASC): [2751 · Trailing Flap Position Indicating System](https://openairdocs.org/jasc/2751)
- Part: Sensor
- Condition: Failed
- Location: Zone 500 Flap
- Stage of operation: AP
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202512163273

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: FLAP EXTENSION FAIL GOING FROM FLAP UP TO FLAP 1. FLAP ASSYMETRY; THE LEFT FLAP REMAINED AT 0; THE RIGHT FLAP STOPPED MIDWAY BETWEEN 0 AND 1.  AIRCRAFT EMERGENCY LANDED SAFELY AT PHX. REMOVED AND REPLACED NUMBER 4 INBOARD FLAP SKEW SENSOR. PER AMM 27-59-01. ACCOMPLISHED ALL REQUIRED TEST. NO HARD FAULTS AT THIS TIME.

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