# SDR AALA20171020001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 19, 2017
- Submitted: October 23, 2017
- Operation: Air carrier
- Aircraft: [N929AA](https://openairdocs.org/aircraft/N929AA), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7525
- Aircraft time: 2,365 hours, 925 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: B-Nut
- Condition: Leaking
- Location: Hyd System
- Stage of operation: CL
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20171020001

## Discrepancy

RETURNED TO FIELD AND AN EMERGENCY LANDING WAS ACCOMPLISHED DUE TO A GREEN SYSTEM HYDRAULIC LOSS.  MAINTENANCE FOUND LANDING GEAR DOOR SELECTOR VALVE CONNECTOR LEAKING. PERFORMED RESET PROCEDURE ON GRAVITY EXTENSION TO MAKE THE LANDING GEAR AND THE DOOR SAFE AFTER A FREEFALL EXTENSION IAW AMM 32-00-00-418-003A.  FOUND THE B-NUT ON THE LEFT MAIN LANDING GEAR DOOR BY PASS VALVE LEAKING.  TIGHTENED THE B-NUT IAW AMM 29-00-00. ACCOMPLISHED SATISFACTORY LEAK AND OPERATIONS CHECK IAW AMM 29-00-00-280-006-A0.  NO ABNORMALITIES NOTED.   THE AIRCRAFT WAS GROUNDED.

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