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A learjet 35 on taxiing off the parking ramp experienced total brake failure resulting in a taxiway incursion. Brake failure caused by a right main gear trunion switch.
| Attributes | |
| ACN | 435332 |
| Time | |
| Date | 199909 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : cmh.airport |
| State Reference | OH |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | ground : taxi |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 195 flight time total : 5930 flight time type : 1690 |
| ASRS Report | 435332 |
| 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 incursion : taxiway other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Taxiing off the parking ramp, the braking system failed to stop the aircraft. (Later determined to be a bad trunion switch in the right main gear.) neither pilot had any control over the aircraft speed and due to frequency congestion we could not alert ground of our problem. Because of this we were unable to hold short of the controled portion of the airport. The incursion on the taxiway did not put us in danger of colliding, we did block an intersection after we coasted to a stop. Ground was immediately notified and company was called to get a tug and bring us back to the ramp. I have never seen training to deal with brake failure on the ground in an aircraft but I sure would like to.
Original NASA ASRS Text
Title: A LEARJET 35 ON TAXIING OFF THE PARKING RAMP EXPERIENCED TOTAL BRAKE FAILURE RESULTING IN A TXWY INCURSION. BRAKE FAILURE CAUSED BY A R MAIN GEAR TRUNION SWITCH.
Narrative: TAXIING OFF THE PARKING RAMP, THE BRAKING SYS FAILED TO STOP THE ACFT. (LATER DETERMINED TO BE A BAD TRUNION SWITCH IN THE R MAIN GEAR.) NEITHER PLT HAD ANY CTL OVER THE ACFT SPD AND DUE TO FREQ CONGESTION WE COULD NOT ALERT GND OF OUR PROB. BECAUSE OF THIS WE WERE UNABLE TO HOLD SHORT OF THE CTLED PORTION OF THE ARPT. THE INCURSION ON THE TXWY DID NOT PUT US IN DANGER OF COLLIDING, WE DID BLOCK AN INTXN AFTER WE COASTED TO A STOP. GND WAS IMMEDIATELY NOTIFIED AND COMPANY WAS CALLED TO GET A TUG AND BRING US BACK TO THE RAMP. I HAVE NEVER SEEN TRAINING TO DEAL WITH BRAKE FAILURE ON THE GND IN AN ACFT BUT I SURE WOULD LIKE TO.
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.