# SDR SWAA2021080200750

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2021
- Submitted: August 2, 2021
- Operation: Air carrier
- Aircraft: [N930WN](https://openairdocs.org/aircraft/N930WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 36636
- Aircraft time: 40,839 hours, 24,488 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Line
- Condition: Leaking
- Location: Hyd System
- Stage of operation: NR
- 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/SWAA2021080200750

## Discrepancy

AT BEGINNING OF DSECENT; NO 2 ENGINE HYDRAULIC PUMP PRESSURE FLICKERED; THEN EVENTUALLY CAME ON STEADY. HYDRAULIC B-SYSTEM QTY WAS 0. DID QRH PROCEDURE TO SECURE ENG DRIVEN PUMP; THEN ELECTRIC PUMP ; LOW PRESSURE LIGHT ILLUMINATED. RAN QRH FOR B-SYSTEM HYDRAULIC SYSTEM FAILURE. / [01] PERFORMED EXTERNAL LEAK CHECK REF AMM 29-00-00-790-801.FOUND HYDRAULIC B PRESS RUDDER TUBE LINE LEAKING.INSPECTED CASE DRAIN FILTERS; NO CONTAMINATION NOTED; REPLACED BOTH FILTERS AS PER REF AMM 29-11-51.INSTALLED TEMP LINE HYDRAULIC B RUDDER PRESS TUBE REF. MPM 53.05.08.02 & REF AMM 20-10-52.SERVICED SYSTEM B HYDRAULICS AS PER REF AMM 12-12-00.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.