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MD11 flight crew experiences a hydraulic leak in cruise after maintenance was performed prior to departure to correct the same problem. Hydraulic system 1 is depressurized and flight continues to destination. The system is pressurized during approach and a normal landing ensues.
| Attributes | |
| ACN | 868375 |
| Time | |
| Date | 201001 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZZ.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Other Controlled |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Hydraulic System Lines Connectors Fittings |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 90 Flight Crew Total 5100 Flight Crew Type 2100 |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 15000 Flight Crew Type 150 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
We accepted an airplane with a hydraulic system 1 leak. Maintenance found a loose b-nut on a hydraulic line. The aircraft was serviced and the maintenance log was cleared for flight. The crew did a hydraulic pressure test which passed. Normal operations during start up and taxi. About 1 hour into cruise; the crew noticed the #1 hydraulic quantity was decreasing. Upon consulting with operations and maintenance control the decision was made to continue to destination. Maintenance control concurred with the decision to depressurize the #1 hydraulic system to prevent further hydraulic fluid leakage. Upon descent the system was pressurized with minimal quantity loss. The landing was normal. The aircraft was then turned over to maintenance with a hydraulic system 1 leak documented in the aircraft logbook.
Original NASA ASRS Text
Title: MD11 Flight Crew experiences a hydraulic leak in cruise after maintenance was performed prior to departure to correct the same problem. Hydraulic system 1 is depressurized and flight continues to destination. The system is pressurized during approach and a normal landing ensues.
Narrative: We accepted an airplane with a hydraulic system 1 leak. Maintenance found a loose B-nut on a hydraulic line. The aircraft was serviced and the maintenance log was cleared for flight. The Crew did a hydraulic pressure test which passed. Normal operations during start up and taxi. About 1 hour into cruise; the Crew noticed the #1 hydraulic quantity was decreasing. Upon consulting with Operations and Maintenance Control the decision was made to continue to destination. Maintenance Control concurred with the decision to depressurize the #1 hydraulic system to prevent further hydraulic fluid leakage. Upon descent the system was pressurized with minimal quantity loss. The landing was normal. The aircraft was then turned over to maintenance with a Hydraulic System 1 leak documented in the Aircraft logbook.
Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.