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An LR60 made 2 attempts to take off and aborted both due to the takeoff warning horn sounding. Found parking brake warning light circuit failed.
| Attributes | |
| ACN | 680141 |
| Time | |
| Date | 200512 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 60 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : cfi pilot : multi engine |
| Experience | flight time last 90 days : 100 flight time total : 1200 flight time type : 250 |
| ASRS Report | 680141 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : tkof warning horn other flight crewa other flight crewb |
| Resolutory Action | flight crew : rejected takeoff |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft Chart Or Publication |
| Primary Problem | Aircraft |
Narrative:
After being cleared for takeoff on runway 30; the before takeoff checklist was completed and; thus; we proceeded under normal conditions with the takeoff. The takeoff warning horn sounded and the takeoff was aborted and tower was notified. No assistance required. Assuming that something on the before takeoff checklist had been missed; the checklist was completed again. In finding nothing out of the ordinary; the consensus was to re-attempt the takeoff. Again; after being cleared for takeoff; the before takeoff checklist was completed and; thus; we proceeded with a normal takeoff. As with the first attempt; the takeoff warning horn sounded and the takeoff was aborted; at which point; it was decided to return to the ramp and reassess the situation. Callback conversation with reporter revealed the following information: the reporter stated that maintenance found the parking brake warning light circuit had failed. The bulb was replaced and it was found the socket may have been defective. The reporter stated that this circuit and the parking brake circuit are an input to the takeoff warning system in addition to stabilizer and spoilers. Reporter noted that the parking brake warning system is not on the takeoff checklist.
Original NASA ASRS Text
Title: AN LR60 MADE 2 ATTEMPTS TO TAKE OFF AND ABORTED BOTH DUE TO THE TKOF WARNING HORN SOUNDING. FOUND PARKING BRAKE WARNING LIGHT CIRCUIT FAILED.
Narrative: AFTER BEING CLRED FOR TKOF ON RWY 30; THE BEFORE TKOF CHKLIST WAS COMPLETED AND; THUS; WE PROCEEDED UNDER NORMAL CONDITIONS WITH THE TKOF. THE TKOF WARNING HORN SOUNDED AND THE TKOF WAS ABORTED AND TWR WAS NOTIFIED. NO ASSISTANCE REQUIRED. ASSUMING THAT SOMETHING ON THE BEFORE TKOF CHKLIST HAD BEEN MISSED; THE CHKLIST WAS COMPLETED AGAIN. IN FINDING NOTHING OUT OF THE ORDINARY; THE CONSENSUS WAS TO RE-ATTEMPT THE TKOF. AGAIN; AFTER BEING CLRED FOR TKOF; THE BEFORE TKOF CHKLIST WAS COMPLETED AND; THUS; WE PROCEEDED WITH A NORMAL TKOF. AS WITH THE FIRST ATTEMPT; THE TKOF WARNING HORN SOUNDED AND THE TKOF WAS ABORTED; AT WHICH POINT; IT WAS DECIDED TO RETURN TO THE RAMP AND REASSESS THE SITUATION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT MAINT FOUND THE PARKING BRAKE WARNING LIGHT CIRCUIT HAD FAILED. THE BULB WAS REPLACED AND IT WAS FOUND THE SOCKET MAY HAVE BEEN DEFECTIVE. THE RPTR STATED THAT THIS CIRCUIT AND THE PARKING BRAKE CIRCUIT ARE AN INPUT TO THE TKOF WARNING SYS IN ADDITION TO STABILIZER AND SPOILERS. RPTR NOTED THAT THE PARKING BRAKE WARNING SYS IS NOT ON THE TKOF CHKLIST.
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.