 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
The number three engine on a B747-400 momentarily spooled back from climb power and then returned to normal operations. The flight crew; in concert with maintenance and dispatch; determined it was safe to complete the flight to destination. Upon landing an engine control 3 EICAS message that had been displayed briefly during the initial event returned.
| Attributes | |
| ACN | 870072 |
| Time | |
| Date | 201001 |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Engine Control |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Shortly after climb thrust was set the #3 engine 'rolled back'; engine fail and engine 3 control EICAS messages were displayed. The first officer confirmed #3 had lost power; but no indication why. At that point the engine started to recover without any pilot input. It continued to spool up and came back to climb power; all indications normal. This whole spool down and back up took approximately 20 seconds. We continued our climb and I contacted dispatch via satcom on the third attempt--call dropped off line the first two times. Dispatch; maintenance control and I agreed the engine was good and we continued to our destination. This aircraft had a history of eec channel 1 being problematic. It looked almost like when N2 got low enough to switch channels the engine spooled right back up. Continued normal flight with all normal indications. Upon exit from runway; EICAS engine 3 control EICAS message came back; although the engine continued to run.
Original NASA ASRS Text
Title: The number three engine on a B747-400 momentarily spooled back from climb power and then returned to normal operations. The flight crew; in concert with Maintenance and Dispatch; determined it was safe to complete the flight to destination. Upon landing an ENG CONTROL 3 EICAS message that had been displayed briefly during the initial event returned.
Narrative: Shortly after climb thrust was set the #3 engine 'rolled back'; ENG FAIL and ENG 3 CONTROL EICAS messages were displayed. The First Officer confirmed #3 had lost power; but no indication why. At that point the engine started to recover without any pilot input. It continued to spool up and came back to climb power; all indications normal. This whole spool down and back up took approximately 20 seconds. We continued our climb and I contacted Dispatch via SATCOM on the third attempt--call dropped off line the first two times. Dispatch; Maintenance Control and I agreed the engine was good and we continued to our destination. This aircraft had a history of EEC channel 1 being problematic. It looked almost like when N2 got low enough to switch channels the engine spooled right back up. Continued normal flight with all normal indications. Upon exit from runway; EICAS ENG 3 CONTROL EICAS message came back; although the engine continued to run.
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.