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A B747-400 diverted to a suitable airport when the number two engine was shut down due to a probable fuel leak.
| Attributes | |
| ACN | 869572 |
| Time | |
| Date | 201001 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Fuel System |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 15500 Flight Crew Type 2500 |
| Person 2 | |
| Function | Relief Pilot Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 180 Flight Crew Total 18000 Flight Crew Type 3900 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Fuel Issue |
Narrative:
Noted that the fuel score showed a decrease of 1800 # in the fuel on board over a period of 47 minutes. Looked at the fuel quantity in each tank and noted that main tank #2 was 4;000lb less than main tank #3. We were at the flight plan recommended altitude and the FMC optimum altitude. The winds and temperature were as forecast. We attempted to reconcile the discrepancy. FMC used fuel - within 100 # for all engines. Fuel flow - within .1 for all engines. Fuel service form showed equal quantity in main tanks #2 and #3. All of these items did not show any reason for the over burn or the fuel imbalance. We accessed the flight manual fuel leak checklist and determined that there was a probable engine fuel leak; talked with dispatch and engine maintenance and they concurred. Received a clearance to descend to a lower altitude and shut the engine down per the procedure. Discussed with dispatch and determined the nearest suitable airport to be ZZZ. Monitored the fuel and did not notice any further fuel loss. Landed uneventfully. Switched the passengers and cargo to another plane and continued to our original destination.
Original NASA ASRS Text
Title: A B747-400 diverted to a suitable airport when the number two engine was shut down due to a probable fuel leak.
Narrative: Noted that the fuel score showed a decrease of 1800 # in the fuel on board over a period of 47 minutes. Looked at the fuel quantity in each tank and noted that main tank #2 was 4;000lb less than main tank #3. We were at the flight plan recommended altitude and the FMC optimum altitude. The winds and temperature were as forecast. We attempted to reconcile the discrepancy. FMC used fuel - within 100 # for all engines. Fuel Flow - within .1 for all engines. Fuel service form showed equal quantity in main tanks #2 and #3. All of these items did not show any reason for the over burn or the fuel imbalance. We accessed the Flight Manual fuel leak checklist and determined that there was a probable engine fuel leak; talked with Dispatch and engine Maintenance and they concurred. Received a clearance to descend to a lower altitude and shut the engine down per the procedure. Discussed with Dispatch and determined the nearest suitable airport to be ZZZ. Monitored the fuel and did not notice any further fuel loss. Landed uneventfully. Switched the passengers and cargo to another plane and continued to our original destination.
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.