# SDR AALA202106249002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 23, 2021
- Submitted: June 24, 2021
- Operation: Air carrier
- Aircraft: [N814NN](https://openairdocs.org/aircraft/N814NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29562
- Aircraft time: 35,841 hours, 14,443 cycles
- System (JASC): [2780 · Leading Edge Slat Control System](https://openairdocs.org/jasc/2780)
- Part: Proximity Sensor
- Condition: Faulted
- Location: Le Slats
- Stage of operation: IN
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202106249002

## Discrepancy

AIRCRAFT WAS GROUNDED: DUE TO GROUND INTERRUPT AND HISTORY OF LEADING EDGE FAULTS, PERFORM FIM TASK 27-51-00-810-801. RECORD THE INDICATED FAULTS AND REPAIR AS REQUIRED. POSSIBLE FAULTY LEADING EDGE FLAP SENSORS. ACCOMPLISHED FIM 27-88-00-810-805. CONFIRMED FAILURE OF F3 PROXIMITY RETRACT SENSOR S172. FAULT CODE 27-81220. REMOVED AND REPLACED S172 IAW AMM 27-88-11-400-802.

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