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Large transport on descent approach had trailing edge flaps extend only 3 degrees causing abnormal flap landing procedure.
| Attributes | |
| ACN | 125199 |
| Time | |
| Date | 198910 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : sfo |
| State Reference | CA |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : oak tower : sjc |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 200 |
| ASRS Report | 125199 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On approach to sfo airport the trailing edge flaps failed to extend beyond 3 degrees (alternate extension system failed, also). An abnormal flap landing was made, without incident. Maintenance found a broken torque tube in the flap drive system (right side) virtually identical to another large transport, owned by the same carrier, that experienced flap drive problems recently. It is possible that there is a common weakness here.
Original NASA ASRS Text
Title: LGT ON DESCENT APCH HAD TRAILING EDGE FLAPS EXTEND ONLY 3 DEGREES CAUSING ABNORMAL FLAP LNDG PROC.
Narrative: ON APCH TO SFO ARPT THE TRAILING EDGE FLAPS FAILED TO EXTEND BEYOND 3 DEGS (ALTERNATE EXTENSION SYSTEM FAILED, ALSO). AN ABNORMAL FLAP LNDG WAS MADE, WITHOUT INCIDENT. MAINT FOUND A BROKEN TORQUE TUBE IN THE FLAP DRIVE SYSTEM (RIGHT SIDE) VIRTUALLY IDENTICAL TO ANOTHER LGT, OWNED BY THE SAME CARRIER, THAT EXPERIENCED FLAP DRIVE PROBLEMS RECENTLY. IT IS POSSIBLE THAT THERE IS A COMMON WEAKNESS HERE.
Data retrieved from NASA's ASRS site as of August 2007 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.