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A B747-400 returned to the gate for maintenance when the leading edge flap/slats failed to extend properly.
| Attributes | |
| ACN | 873748 |
| Time | |
| Date | 201002 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Taxi |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Flap Control (Trailing & Leading Edge) |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 65 Flight Crew Total 22000 Flight Crew Type 2000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
On taxi out the first officer selected flaps to the 10 degree take off position. 'Flaps primary' came up almost immediately on the EICAS followed within a minute by 'flaps drive'. The #1 slat was not configured properly. Returned to the gate. Maintenance said they found slat drive shaft sheared. Aircraft taken out of service.
Original NASA ASRS Text
Title: A B747-400 returned to the gate for maintenance when the leading edge flap/slats failed to extend properly.
Narrative: On taxi out the First Officer selected flaps to the 10 degree take off position. 'FLAPS PRIMARY' came up almost immediately on the EICAS followed within a minute by 'FLAPS DRIVE'. The #1 slat was not configured properly. Returned to the gate. Maintenance said they found slat drive shaft sheared. Aircraft taken out of service.
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.