# SDR AALA202111224276

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 21, 2021
- Submitted: November 22, 2021
- Operation: Air carrier
- Aircraft: [N939NN](https://openairdocs.org/aircraft/N939NN), registered now
- Make and model: Boeing 737*
- Aircraft serial: 33491
- Aircraft time: 23,855 hours, 9,255 cycles
- System (JASC): [3230 · Landing Gear Retraction/Extension System](https://openairdocs.org/jasc/3230)
- Part: Pseu
- Condition: Faulty
- Location: Zone 700 - Gears
- Stage of operation: TO
- How discovered: V
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202111224276

## Discrepancy

AIRCRAFT WAS GROUNDED: ON TAKEOFF, LANDING GEAR WOULD NOT RETRACT AFTER MULTIPLE ATTEMPTS; FLIGHT DECLARED EMERGENCY AND RETURNED TO FIELD. REPLACED PROXIMITY SENSOR ELECTRONIC UNIT IAW AMM 32-09-10, OPS CHECK GOOD.

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