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An SF340 flight crew was towed back to the gate when a hydraulic pump malfunctioned on taxi out. Maintenance activity proved ineffective when the aircraft suffered a complete hydraulic failure on the next flight.
| Attributes | |
| ACN | 868724 |
| Time | |
| Date | 201001 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | SF 340B |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Taxi |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Hydraulic System Pump |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 35 Flight Crew Total 9000 Flight Crew Type 4000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
While holding short of the runway running checklists; we noticed hydr cwp illuminated. Completed memory items and checklist card. Proceeded with checklist and determined the auto function of the pump had failed. (No longer a deferrable item under MEL.) contacted company; maintenance; and dispatch. Crew decided to be prudent and tow to the gate due to past situations when crews having auto function fail then had the entire pump fail when on taxi. Towed to gate. Process only took 10 minutes. When I called maintenance and advised them of the situation they seemed irritated that I had requested a tow. I replied that other crews have experienced complete pump failure when auto function failed. Maintenance cleared the discrepancy with a sensor/switch change. Aircraft remained at gate for over 6 hours until next crew took aircraft for a flight. I advised that crew of my earlier situation; and to be aware. The crew after takeoff could not retract the gear. They returned after declaring an emergency; with a complete hydraulic failure.
Original NASA ASRS Text
Title: An SF340 flight crew was towed back to the gate when a hydraulic pump malfunctioned on taxi out. Maintenance activity proved ineffective when the aircraft suffered a complete hydraulic failure on the next flight.
Narrative: While holding short of the runway running checklists; we noticed HYDR CWP illuminated. Completed memory items and checklist card. Proceeded with checklist and determined the auto function of the pump had failed. (No longer a deferrable item under MEL.) Contacted Company; Maintenance; and Dispatch. Crew decided to be prudent and tow to the gate due to past situations when crews having auto function fail then had the entire pump fail when on taxi. Towed to gate. Process only took 10 minutes. When I called Maintenance and advised them of the situation they seemed irritated that I had requested a tow. I replied that other crews have experienced complete pump failure when auto function failed. Maintenance cleared the discrepancy with a sensor/switch change. Aircraft remained at gate for over 6 hours until next crew took aircraft for a flight. I advised that crew of my earlier situation; and to be aware. The crew after takeoff could not retract the gear. They returned after declaring an emergency; with a complete hydraulic failure.
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.