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A B737-700 landed with flaps stuck in the 25 unit position. Normal flap position for landing 30 or 40 unit position. Cause of failure unknown.
| Attributes | |
| ACN | 524116 |
| Time | |
| Date | 200109 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : las.airport |
| State Reference | NV |
| Altitude | agl single value : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Thunderstorm Windshear |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : las.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 25l |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 225 flight time total : 5750 flight time type : 2250 |
| ASRS Report | 524116 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 223 flight time total : 15321 flight time type : 2006 |
| ASRS Report | 524117 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : flap position indication other flight crewa other flight crewb |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
Landed with flaps at 25 degree. GPWS warning, 'too low, flaps,' cause, flaps stuck at 25 degree/symmetrical, with 40DEG selected. Cycled flap lever from 25 to 40, with no results. Repositioned flap lever to 25 degrees, and landed. Referenced 'the flap malfunction' QRH checklist: crew decided to land because 1) in position and configuration to execute safe landing. 2) did not wish to use altitude ext system for flaps (flaps already symmetrical at 25 degree and led's were green/full extended, with both hydraulic systems normal) and 3) preferred not to execute go around and reposition flap lever to below current 25 degree setting. Bugged vref 15, and used VM25 on airspeed indicator for reference to safe landing and rollout.
Original NASA ASRS Text
Title: A B737-700 LANDED WITH FLAPS STUCK IN THE 25 UNIT POSITION. NORMAL FLAP POSITION FOR LNDG 30 OR 40 UNIT POSITION. CAUSE OF FAILURE UNKNOWN.
Narrative: LANDED WITH FLAPS AT 25 DEG. GPWS WARNING, 'TOO LOW, FLAPS,' CAUSE, FLAPS STUCK AT 25 DEG/SYMMETRICAL, WITH 40DEG SELECTED. CYCLED FLAP LEVER FROM 25 TO 40, WITH NO RESULTS. REPOSITIONED FLAP LEVER TO 25 DEGS, AND LANDED. REFERENCED 'THE FLAP MALFUNCTION' QRH CHKLIST: CREW DECIDED TO LAND BECAUSE 1) IN POSITION AND CONFIGURATION TO EXECUTE SAFE LNDG. 2) DID NOT WISH TO USE ALT EXT SYSTEM FOR FLAPS (FLAPS ALREADY SYMMETRICAL AT 25 DEG AND LED'S WERE GREEN/FULL EXTENDED, WITH BOTH HYDRAULIC SYSTEMS NORMAL) AND 3) PREFERRED NOT TO EXECUTE GAR AND REPOSITION FLAP LEVER TO BELOW CURRENT 25 DEG SETTING. BUGGED VREF 15, AND USED VM25 ON AIRSPEED INDICATOR FOR REFERENCE TO SAFE LNDG AND ROLLOUT.
Data retrieved from NASA's ASRS site as of July 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.