# SDR SWAA120236

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 12, 2012
- Submitted: January 13, 2012
- Operation: Air carrier
- Aircraft: N323SW
- Make and model: Boeing 737-3H4
- Registry model: [Boeing 737-3H4](https://openairdocs.org/model/boeing-737-3h4) (OpenAirDocs)
- Aircraft serial: 23344
- Aircraft time: 78,743 hours, 70,362 cycles
- System (JASC): [2920 · Hydraulic System, Auxiliary](https://openairdocs.org/jasc/2920)
- Part: O-Ring
- Condition: Leaking
- Location: Hydraulic Sys
- Stage of operation: UK
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA120236

## Discrepancy

DECLARED EMERGENCY - AT ALT "B" SYS HYDRAULIC QUANTITY RAPIDLY FELL TO 1/3 FULL.  SHORTLY AFTER B SYS ENGINE DRIVEN PUMP LOW PRESSURE LIGHT ILLUMINATED.  PUMP SHUT DOWN IAW QRH.  FOUND "B" SYS PRESSURE LINE TO LANDING GEAR TRANSFER VALVE LEAKED.  REMOVED AND REPLACED O-RING, B SYS.  RETURN FILTER, CASE DRAIN FILTER FOR EDP & EDMP PER MM.

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