# SDR SWAA95286

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 6, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N96SW](https://openairdocs.org/aircraft/N96SW), registered now
- Make and model: Boeing 737-2H4
- Registry model: [Boeing 737-2H4](https://openairdocs.org/model/boeing-737-2h4) (OpenAirDocs)
- Aircraft serial: 23055
- System (JASC): [2911 · Hydraulic Power Accumulator, Main](https://openairdocs.org/jasc/2911)
- Part: Hyd Pumps
- Part number: 623337
- Condition: Malfunctioned
- Location: Lt/Rt Engine
- Stage of operation: CL
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA95286

## Discrepancy

IN FLIGHT, NUMBER 1 AND 2 ENGINE HYDRAULIC PUMPS INDICATED LOW PRESSURE, 'A' SYSTEM QUANTITY DISPLAYED ZERO.  AIRCRAFT RETURNED TO SAT AND MADE AN UNEVENTFUL LANDING.  AFTER LANDING, SYSTEM 'A' INDICATED 1.5 GAL AND BEFORE REACHING GATE, INDICATED 2.5 GAL.  FOUND O-RING RUPTURED ON NR 2 'A' SYSTEM PRESSURE SWITCH.  REMOVED AND REPLACED BOTH ENGINE DRIVEN PUMPS, LOW PRESSURE SWITCH, CASE DRAIN FILTERS, AND SYSTEM 'A' FILTER.  OP/PRESSURE CHECKED SYSTEM PER BOEING MM, NR 1 PUMP S/N MX398721 AND NR 2, MX369280.

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