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A B737-300 rejected a takeoff when the leading edge flap indicator circuit breaker popped and the takeoff warning horn sounded because of a control box failure.
| Attributes | |
| ACN | 720934 |
| Time | |
| Date | 200612 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phx.airport |
| State Reference | AZ |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 206 flight time type : 4500 |
| ASRS Report | 720934 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 133 flight time type : 2700 |
| ASRS Report | 720935 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : rejected takeoff |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
On taxi out; thrust lever check takeoff warning horn sounded. Found leading edge flap indicator circuit breaker out. Reset circuit breaker thrust lever check ok; continued taxi for takeoff. We were cleared for takeoff. After takeoff power was set; at approximately 90 KTS takeoff warning horn sounded; aborted the takeoff. We cleared the runway; obtained brake cooling data from opc; recommended 36 min brake cooling at the gate. We returned to the gate. We advised maintenance and dispatch. Logbook entry completed. Callback conversation with reporter revealed the following information: the reporter stated that one of the two flap control boxes had been changed the night before this flight. The newly installed box had an internal failure caused by the improper installation of the box's quick install handle shorting against some internal circuit board components. The control box was changed again and the flight continued.
Original NASA ASRS Text
Title: A B737-300 REJECTED A TKOF WHEN THE LEADING EDGE FLAP INDICATOR CIRCUIT BREAKER POPPED AND THE TKOF WARNING HORN SOUNDED BECAUSE OF A CTL BOX FAILURE.
Narrative: ON TAXI OUT; THRUST LEVER CHK TKOF WARNING HORN SOUNDED. FOUND LEADING EDGE FLAP INDICATOR CIRCUIT BREAKER OUT. RESET CIRCUIT BREAKER THRUST LEVER CHK OK; CONTINUED TAXI FOR TKOF. WE WERE CLRED FOR TKOF. AFTER TKOF PWR WAS SET; AT APPROX 90 KTS TKOF WARNING HORN SOUNDED; ABORTED THE TKOF. WE CLRED THE RWY; OBTAINED BRAKE COOLING DATA FROM OPC; RECOMMENDED 36 MIN BRAKE COOLING AT THE GATE. WE RETURNED TO THE GATE. WE ADVISED MAINT AND DISPATCH. LOGBOOK ENTRY COMPLETED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT ONE OF THE TWO FLAP CTL BOXES HAD BEEN CHANGED THE NIGHT BEFORE THIS FLT. THE NEWLY INSTALLED BOX HAD AN INTERNAL FAILURE CAUSED BY THE IMPROPER INSTALLATION OF THE BOX'S QUICK INSTALL HANDLE SHORTING AGAINST SOME INTERNAL CIRCUIT BOARD COMPONENTS. THE CTL BOX WAS CHANGED AGAIN AND THE FLT CONTINUED.
Data retrieved from NASA's ASRS site as of January 2009 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.