# SDR CALA2018020900506

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 9, 2018
- Submitted: February 9, 2018
- Operation: Air carrier
- Aircraft: N403UA
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 442
- Aircraft time: 78,364 hours, 29,784 cycles
- System (JASC): [3230 · Landing Gear Retraction/Extension System](https://openairdocs.org/jasc/3230)
- Part: Isolation Valve
- Part number: S4340131004
- Part serial: 3653
- Condition: Failed
- Location: Mlg
- Part time: 63,850 hours, 26,441 cycles
- Stage of operation: AP
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2018020900506

## Discrepancy

LANDING GEAR DID NOT EXTEND USING GEAR HANDLE.  PERFORMED GRAVITY EXTENSION.  EMERGENCY DECLARED.  IAW TSM 32-31-00-810-808-A. PFR SHOWS RT MLG DOOR ACTUATOR.  BOTH LGICUS SHOW NO FAULTS.  REPLACED 62GA RELAY AND 49GA LANDING GEAR SYS ISOLATION SAFETY VALVE.  REPLACED THE SAFETY VALVE. OPERATED GEAR HANDLE 4 TIMES,  DOORS AND GEAR CHECKED OK. NO FAULTS.

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