# SDR DALA2021030901337

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 8, 2021
- Submitted: March 9, 2021
- Operation: Air carrier
- Aircraft: [N539US](https://openairdocs.org/aircraft/N539US), registered now
- Make and model: Boeing 757251
- Aircraft serial: 26486
- Aircraft time: 74,915 hours, 27,928 cycles
- Engine: Pwa PW2037
- Engine time: 69,744 hours, 24,522 cycles
- System (JASC): [2913 · Hydraulic Pump (Electric/Engine), Main](https://openairdocs.org/jasc/2913)
- Part: Pump
- Condition: Malfunctioned
- Location: Rt Hyd System
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2021030901337

## Discrepancy

SHIP 5639 - CREW NOTICED RIGHT HYDRAULIC QUANTITY REDUCING. QUANTITY DROPPED TO 0.19 AND CREW SECURED PUMP OFF. AN EMERGENCY WAS DECLARED WITH ATC. TAXI TO GATE WITH NO ADVERSE SYSTEMS EFFECTED. CORRECTIVE ACTION: MAINTENANCE REPLACED THE RIGHT ENGINE DRIVEN HYDRAULIC PUMP AND THE ANTI-SKID SHUTTLE VALVE. OPERATIONAL CHECK AND LEAK CHECK WERE GOOD WITH NO SHIFT IN HYDRAULIC QUANTITY. THE AIRCRAFT HAS RETURNED TO SERVICE. (LP #7451308)

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