# SDR Q2SA20111211001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 11, 2011
- Submitted: December 12, 2011
- Operation: Air carrier
- Aircraft: [N765SA](https://openairdocs.org/aircraft/N765SA), registered now
- Make and model: Boeing 747-2F6B
- Registry model: [Boeing 747-2F6B](https://openairdocs.org/model/boeing-747-2f6b) (OpenAirDocs)
- Aircraft serial: 21833
- Aircraft time: 98,245 hours, 20,239 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Hydraulic Line
- Part number: 65B01512286
- Condition: Chafed
- Location: Hydraulic Sys
- Stage of operation: CR
- How discovered: O
- Nature of condition: K
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/Q2SA20111211001

## Discrepancy

APPROXIMATELY ONE HOUR INTO FLIGHT, NUMBER FOUR HYDRAULIC QUANTITY DROPPED TO 2.4 GALLONS.  FOLLOWED QRH PROCEDURES BY TURNING PUMPS OFF.  FINISHED QRH PRIOR TO LANDING.  FOUND NR 4 HYDRAULIC RETURN LINE LEAKING.  REPLACED NR 4 HYDRAULIC RETURN LINE IAW B747-AMM 20-50-01.  LEAK CHECK GOOD, NO DEFECTS NOTED.

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