# SDR 0202699975

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 27, 2002
- Submitted: September 3, 2002
- Operation: Air carrier
- Aircraft: N9339
- Make and model: Doug DC-9-31
- Registry model: [Doug DC-9-31](https://openairdocs.org/model/douglas-dc-9-31) (OpenAirDocs)
- Aircraft serial: 47382
- Aircraft time: 81,359 hours, 84,889 cycles
- System (JASC): [2915 · Hydraulic Pressure Relief Valve, Main](https://openairdocs.org/jasc/2915)
- Part: Relief Valve
- 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/0202699975

## Discrepancy

DURING GEAR UPLATCH CHECK AFTER TAKEOFF, THE RIGHT HYDRAULIC SYSTEM FLUID QUANTITY WENT TO ZERO.  GEAR DOOR OPENED AND MAIN LANDING GEAR EXTENDED AS THE HYDRAULIC SYSTEM FAILED.  CREW ENSURED GEAR WAS PROPERLY EXTENDED PER COM.  FLIGHT RETURNED TO MDT AND LANDED SAFELY.  MAIN GEAR DOORS WERE DAMAGED ON LANDING.  MAINTENANCE FOUND THE PRESSURE RELIEF VALVE IN THE RIGHT WHEEL WELL LEAKING.  REPLACED THE PRESSURE RELIEF VALVE, BOTH THE ELECTRIC AND ENGINE DRIVEN HYDRAULIC PUMPS AND ASSOCIATED FILTERS, AND GEAR DOORS.  RESERVICED THE SYSTEM.  LEAK AND OPERATIONAL CHECK GOOD.  AIRCRAFT RETURNED TO SERVICE.

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