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B737 flight crew reports flap asymmetry during approach as indicated but not felt by the PF. Aircraft is light and partial flap landing ensues.
| Attributes | |
| ACN | 759763 |
| Time | |
| Date | 200710 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 200 flight time type : 200 |
| ASRS Report | 759763 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : flap position ind other flight crewa |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Discovered split flap condition on approach; approximately 9 degrees right; 13 degrees left. We were light weight -44 passenger; 6000 pounds fuel. Long runway; light winds. I decided to land straight ahead. Normal landing. We cycled flaps once; same condition. Landing data showed good for landing in those conditions. Worked fine when maintenance came on the ground; of course. Callback conversation with reporter revealed the following information: the PF never felt any flap asymmetry in the controls and it is suspected that the flap position indicator was sticking; causing the flaps to lock. This condition could not be duplicated when maintenance came onboard at the gate; although it is believed that the flap position indicator was later changed as a precaution.
Original NASA ASRS Text
Title: B737 FLT CREW REPORTS FLAP ASYMMETRY DURING APPROACH AS INDICATED BUT NOT FELT BY THE PF. ACFT IS LIGHT AND PARTIAL FLAP LANDING ENSUES.
Narrative: DISCOVERED SPLIT FLAP CONDITION ON APCH; APPROX 9 DEGS R; 13 DEGS L. WE WERE LIGHT WT -44 PAX; 6000 LBS FUEL. LONG RWY; LIGHT WINDS. I DECIDED TO LAND STRAIGHT AHEAD. NORMAL LNDG. WE CYCLED FLAPS ONCE; SAME CONDITION. LNDG DATA SHOWED GOOD FOR LNDG IN THOSE CONDITIONS. WORKED FINE WHEN MAINT CAME ON THE GND; OF COURSE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE PF NEVER FELT ANY FLAP ASYMMETRY IN THE CONTROLS AND IT IS SUSPECTED THAT THE FLAP POSITION INDICATOR WAS STICKING; CAUSING THE FLAPS TO LOCK. THIS CONDITION COULD NOT BE DUPLICATED WHEN MAINTENANCE CAME ONBOARD AT THE GATE; ALTHOUGH IT IS BELIEVED THAT THE FLAP POSITION INDICATOR WAS LATER CHANGED AS A PRECAUTION.
Data retrieved from NASA's ASRS site as of January 2009 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.