# SDR DXTA2011072504668

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 22, 2011
- Submitted: July 25, 2011
- Operation: Air carrier
- Aircraft: [N971QS](https://openairdocs.org/aircraft/N971QS), registered now
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500071
- Aircraft time: 10,791 hours, 6,650 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Pump
- Part number: 66166
- Part serial: LZ80P
- Condition: Leaking
- Location: Hyd System
- Part time: 10,630 hours, 6,519 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2011072504668

## Discrepancy

DURING FLIGHT AT FL410, LEFT HYD QTY AT 22 PERCENT.  NOTICED 1 PERCENT DROP EVERY 3 MINUTES.  AT 19 PERCENT, AMBER CASS MESSAGE HYD VOLUME LOW ILLUMINATED.  CONDUCTED CHECKLIST.  HAD TO BLOW DOWN GEAR FOR LANDING AND USE THE EMERGENCY BRAKE UNTILL STOPPED.  R & R LEAKING LEFT HYD PUMP IAW MM 25-10-02.  OPS AND LEAK CHECKED GOOD.

---
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.