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B747 crew lost the number four hydraulic system fluid during cruise. Crew elects to continue to destination and lands normally after declaring an emergency.
| Attributes | |
| ACN | 983882 |
| Time | |
| Date | 201112 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Hydraulic System Lines Connectors Fittings |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Level cruise flight when the flight engineer alerted me to the hydraulic qty light on number 4; it was approximately 2.5 gallons and decreasing slowly. I transferred controls to the first officer; and the flight engineer and I completed QRH. Fluid quantity continued to decrease. After consulting with dispatch and the chief pilot; after considering fuel state; weather; and aircraft condition; elected to continue to destination. On hand off to approach; we declared an emergency due to abnormal extension of gear and flaps; executed the QRH procedures for loss of number 4 hydraulic system; and executed a normal flaps 25 landing. [There was a] hole in hydraulic line in number 4 pylon; causing loss of number 4 hydraulic system fluid.
Original NASA ASRS Text
Title: B747 crew lost the number four hydraulic system fluid during cruise. Crew elects to continue to destination and lands normally after declaring an emergency.
Narrative: Level cruise flight when the Flight Engineer alerted me to the HYD QTY light on number 4; it was approximately 2.5 gallons and decreasing slowly. I transferred controls to the First Officer; and the Flight Engineer and I completed QRH. Fluid quantity continued to decrease. After consulting with Dispatch and the Chief Pilot; after considering fuel state; weather; and aircraft condition; elected to continue to destination. On hand off to Approach; we declared an emergency due to abnormal extension of gear and flaps; executed the QRH procedures for loss of number 4 hydraulic system; and executed a normal flaps 25 landing. [There was a] hole in hydraulic line in number 4 pylon; causing loss of number 4 hydraulic system fluid.
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.