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B737 captain reported a faulty leading edge slat micro switch caused two takeoff configuration warnings during takeoff roll.
| Attributes | |
| ACN | 1691658 |
| Time | |
| Date | 201910 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | LAS.Airport |
| State Reference | NV |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-900 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Leading Edge Slat |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Maintenance |
Narrative:
Takeoff configuration warning. During takeoff roll approximately 130 kts the takeoff configuration warning activated. Takeoff weight was 161;000 lbs. Full aircraft. 24k power. I was the captain and the first officer was pilot flying. The flaps; le devices; and speed-brake were all in the correct position. The configuration warning then stopped. At some point I said 'continue'. This all happened in a short period of time. The takeoff configuration warning came back on about 147 kts. The aircraft was accelerating normally and there was not much runway left; 3000 ft. The configuration warning being intermittent it seemed the safest course of action was to continue the takeoff. We made an otherwise normal takeoff and continued to las. On the approach to las the le flaps transit light stayed on. We also got a low airspeed warning due to the amber band/min speed being incorrect. We made a normal 30 flap landing using the HUD aoa as a backup. Later; maintenance determined that the le flap up micro switch had malfunctioned. This was written up previously; a few days before. Perhaps more should have been done to understand why it happened the first time.
Original NASA ASRS Text
Title: B737 Captain reported a faulty leading edge slat micro switch caused two takeoff configuration warnings during takeoff roll.
Narrative: Takeoff configuration warning. During takeoff roll approximately 130 kts the takeoff configuration warning activated. Takeoff weight was 161;000 lbs. Full aircraft. 24k power. I was the Captain and the First officer was Pilot Flying. The flaps; LE devices; and speed-brake were all in the correct position. The configuration warning then stopped. At some point I said 'continue'. This all happened in a short period of time. The takeoff configuration warning came back on about 147 kts. The aircraft was accelerating normally and there was not much runway left; 3000 ft. The configuration warning being intermittent it seemed the safest course of action was to continue the takeoff. We made an otherwise normal takeoff and continued to LAS. On the approach to LAS the LE Flaps transit light stayed on. We also got a low airspeed warning due to the amber band/min speed being incorrect. We made a normal 30 flap landing using the HUD AOA as a backup. Later; Maintenance determined that the LE flap up micro switch had malfunctioned. This was written up previously; a few days before. Perhaps more should have been done to understand why it happened the first time.
Data retrieved from NASA's ASRS site 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.