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An airbus 300 on approach at 4000 ft declared an emergency due to the leading edge slats failing to extend caused by 2 failed slat jackscrews.
| Attributes | |
| ACN | 455078 |
| Time | |
| Date | 199911 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : jfk.airport |
| Altitude | msl single value : 4000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 455078 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| ASRS Report | 454878 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : slat warning light other flight crewa other flight crewb |
| Resolutory Action | flight crew : declared emergency |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : testing performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Aircraft |
Narrative:
On first flight out of heavy maintenance, slats failed to extend during approach to landing. Accomplished abnormal procedures, declared emergency and landed uneventfully on runway 31L at jfk. Failure resulted in a no slats flaps 40 degree landing at jfk. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was on a reliability test flight out of heavy maintenance and all flight control checks were made prior to flight and all checked good. The reporter said on approach when it was discovered the slats would not extend an emergency was declared and the landing was made with trailing edge only, at a higher speed. The reporter stated the failed jackscrews normally drive the slats from full up to extend and retract. The reporter said the failure mode of the jackscrews mechanical or maintenance caused is unknown.
Original NASA ASRS Text
Title: AN AIRBUS 300 ON APCH AT 4000 FT DECLARED AN EMER DUE TO THE LEADING EDGE SLATS FAILING TO EXTEND CAUSED BY 2 FAILED SLAT JACKSCREWS.
Narrative: ON FIRST FLT OUT OF HVY MAINT, SLATS FAILED TO EXTEND DURING APCH TO LNDG. ACCOMPLISHED ABNORMAL PROCS, DECLARED EMER AND LANDED UNEVENTFULLY ON RWY 31L AT JFK. FAILURE RESULTED IN A NO SLATS FLAPS 40 DEG LNDG AT JFK. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS ON A RELIABILITY TEST FLT OUT OF HVY MAINT AND ALL FLT CTL CHKS WERE MADE PRIOR TO FLT AND ALL CHKED GOOD. THE RPTR SAID ON APCH WHEN IT WAS DISCOVERED THE SLATS WOULD NOT EXTEND AN EMER WAS DECLARED AND THE LNDG WAS MADE WITH TRAILING EDGE ONLY, AT A HIGHER SPD. THE RPTR STATED THE FAILED JACKSCREWS NORMALLY DRIVE THE SLATS FROM FULL UP TO EXTEND AND RETRACT. THE RPTR SAID THE FAILURE MODE OF THE JACKSCREWS MECHANICAL OR MAINT CAUSED IS UNKNOWN.
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.