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A B737-800 made two aborted low speed takeoffs. First caused by wing anti-valve not closed and second caused by failed #1 engine cowl anti-ice valve.
| Attributes | |
| ACN | 491855 |
| Time | |
| Date | 200011 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw.airport |
| State Reference | TX |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | other |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tower : dfw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 120 flight time total : 14000 flight time type : 300 |
| ASRS Report | 491855 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : master caution-anti-ice other flight crewa other flight crewb |
| Resolutory Action | flight crew : rejected takeoff other |
| Consequence | other |
| Supplementary | |
| Problem Areas | Environmental Factor Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Aircraft was deiced due to frost on the wings. Wing and engine anti-ice was on for takeoff. When power was advanced for takeoff, the master caution/anti-ice lights illuminated. The takeoff was aborted at 10 KTS. Cleared runway and contacted maintenance. It was determined that the wing anti-ice valve was slow to close. The valve was cycled twice and operated normally. A second takeoff was initiated. The engines were run up to 50% N1 and all indications were normal. Brakes were released and power was advanced to takeoff power. The master caution/anti-ice and the #1 engine cowl anti-ice light illuminated this time (different problem). Takeoff was aborted at 10 KTS and aircraft returned to the gate for maintenance. Callback conversation with reporter revealed the following information: the reporter stated the first abort was caused by a slow operating wing anti-ice valve and after running it several times the valve speed improved. The reporter said a second takeoff was attempted but this time #1 engine cowl anti-ice fail light came on. The reporter said the takeoff was rejected at 10 KTS and the aircraft was returned to the gate. The reporter stated the left engine cowl anti-ice valve was rendered inoperative open and deferred per the MEL.
Original NASA ASRS Text
Title: A B737-800 MADE TWO ABORTED LOW SPD TKOFS. FIRST CAUSED BY WING ANTI-VALVE NOT CLOSED AND SECOND CAUSED BY FAILED #1 ENG COWL ANTI-ICE VALVE.
Narrative: ACFT WAS DEICED DUE TO FROST ON THE WINGS. WING AND ENG ANTI-ICE WAS ON FOR TKOF. WHEN PWR WAS ADVANCED FOR TKOF, THE MASTER CAUTION/ANTI-ICE LIGHTS ILLUMINATED. THE TKOF WAS ABORTED AT 10 KTS. CLRED RWY AND CONTACTED MAINT. IT WAS DETERMINED THAT THE WING ANTI-ICE VALVE WAS SLOW TO CLOSE. THE VALVE WAS CYCLED TWICE AND OPERATED NORMALLY. A SECOND TKOF WAS INITIATED. THE ENGS WERE RUN UP TO 50% N1 AND ALL INDICATIONS WERE NORMAL. BRAKES WERE RELEASED AND PWR WAS ADVANCED TO TKOF PWR. THE MASTER CAUTION/ANTI-ICE AND THE #1 ENG COWL ANTI-ICE LIGHT ILLUMINATED THIS TIME (DIFFERENT PROB). TKOF WAS ABORTED AT 10 KTS AND ACFT RETURNED TO THE GATE FOR MAINT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FIRST ABORT WAS CAUSED BY A SLOW OPERATING WING ANTI-ICE VALVE AND AFTER RUNNING IT SEVERAL TIMES THE VALVE SPD IMPROVED. THE RPTR SAID A SECOND TKOF WAS ATTEMPTED BUT THIS TIME #1 ENG COWL ANTI-ICE FAIL LIGHT CAME ON. THE RPTR SAID THE TKOF WAS REJECTED AT 10 KTS AND THE ACFT WAS RETURNED TO THE GATE. THE RPTR STATED THE L ENG COWL ANTI-ICE VALVE WAS RENDERED INOP OPEN AND DEFERRED PER THE MEL.
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.