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A B737-400 on approach into sea is unable to extend a leading edge device, however, it matches appropriate leading edge device on other wing. The flight crew then decides not to perform any abnormal procedures and lands the aircraft in normal confign.
| Attributes | |
| ACN | 370589 |
| Time | |
| Date | 199706 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sea |
| State Reference | WA |
| Altitude | agl bound lower : 1500 agl bound upper : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : sea tower : mem |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach landing other |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 11500 flight time type : 3500 |
| ASRS Report | 370589 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On approach into sea (VFR, ILS runway 16R). After selection of flaps 10 degrees #5 leading edge slat showed amber/in- transit light. (At flaps 5 degrees, had green leading edge flaps extension light, so all leading edges had extended properly to intermediate position.) but at flaps 10 degrees, with amber/in-transit light -- visually checked leading edge #5 to be flush/symmetrical with #6. (B737-400 abnormal checklist was consulted, 'leading edge device failure: asymmetrical, partial or no leading edge devices -- plan a flaps 15 degree landing -- set vref 15 + 5 KTS.') but since we had none of the above, and visually confirmed #5 leading edge slat was fully extended, I elected to put out full flaps and land normally.
Original NASA ASRS Text
Title: A B737-400 ON APCH INTO SEA IS UNABLE TO EXTEND A LEADING EDGE DEVICE, HOWEVER, IT MATCHES APPROPRIATE LEADING EDGE DEVICE ON OTHER WING. THE FLC THEN DECIDES NOT TO PERFORM ANY ABNORMAL PROCS AND LANDS THE ACFT IN NORMAL CONFIGN.
Narrative: ON APCH INTO SEA (VFR, ILS RWY 16R). AFTER SELECTION OF FLAPS 10 DEGS #5 LEADING EDGE SLAT SHOWED AMBER/IN- TRANSIT LIGHT. (AT FLAPS 5 DEGS, HAD GREEN LEADING EDGE FLAPS EXTENSION LIGHT, SO ALL LEADING EDGES HAD EXTENDED PROPERLY TO INTERMEDIATE POS.) BUT AT FLAPS 10 DEGS, WITH AMBER/IN-TRANSIT LIGHT -- VISUALLY CHKED LEADING EDGE #5 TO BE FLUSH/SYMMETRICAL WITH #6. (B737-400 ABNORMAL CHKLIST WAS CONSULTED, 'LEADING EDGE DEVICE FAILURE: ASYMMETRICAL, PARTIAL OR NO LEADING EDGE DEVICES -- PLAN A FLAPS 15 DEG LNDG -- SET VREF 15 + 5 KTS.') BUT SINCE WE HAD NONE OF THE ABOVE, AND VISUALLY CONFIRMED #5 LEADING EDGE SLAT WAS FULLY EXTENDED, I ELECTED TO PUT OUT FULL FLAPS AND LAND NORMALLY.
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.