# SDR AALA202107201651

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 19, 2021
- Submitted: July 21, 2021
- Operation: Air carrier
- Aircraft: [N821NN](https://openairdocs.org/aircraft/N821NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 30912
- Aircraft time: 35,151 hours, 14,235 cycles
- System (JASC): [2781 · Leading Edge Slat Position Indicating System](https://openairdocs.org/jasc/2781)
- Part: Sensor
- Condition: Inoperative
- Location: Nr 4 Le Flap
- Stage of operation: CL
- 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/AALA202107201651

## Discrepancy

AIRCRAFT WAS GROUNDED: LEADING EDGE SLAT POSITION FOUR REMAINED ILLUMINATED AFTER FLAP RETRACTION.  CREW DECLARED EMERGENCY AND RETURNED TO PHL. REMOVED AND REPLACED #4 LEADING EDGE FLAP RETRACT AND EXTENDED SENSOR. OPS CK GOOD AMM 27-88-11

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