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During pushback and engine start an attempt to set the parking brake fails and the aircraft moves forward until alternative sources of brake pressure are obtained.
| Attributes | |
| ACN | 692917 |
| Time | |
| Date | 200604 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : tpa.airport |
| State Reference | FL |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : pushback |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 240 flight time type : 2000 |
| ASRS Report | 692917 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Completed preflight checks normally ensuring brake pressures were normal. On pushback; I was starting the #1 engine when I heard the captain tell the push crew 'brakes set; pressure normal.' the captain then stated that we were rolling. He turned off parking brake; and the nosewheel steering disc to 'on.' I turned on the yellow electrical hydraulic pump and we came to a smooth stop after rolling an estimated 3 ft. The push crew reported there were no injuries and that the parking brake set light in wheel well was on. Brakes acted normally after this.
Original NASA ASRS Text
Title: DURING PUSHBACK AND ENG START AN ATTEMPT TO SET THE PARKING BRAKE FAILS AND THE ACFT MOVES FORWARD UNTIL ALTERNATIVE SOURCES OF BRAKE PRESSURE ARE OBTAINED.
Narrative: COMPLETED PREFLT CHKS NORMALLY ENSURING BRAKE PRESSURES WERE NORMAL. ON PUSHBACK; I WAS STARTING THE #1 ENG WHEN I HEARD THE CAPT TELL THE PUSH CREW 'BRAKES SET; PRESSURE NORMAL.' THE CAPT THEN STATED THAT WE WERE ROLLING. HE TURNED OFF PARKING BRAKE; AND THE NOSEWHEEL STEERING DISC TO 'ON.' I TURNED ON THE YELLOW ELECTRICAL HYD PUMP AND WE CAME TO A SMOOTH STOP AFTER ROLLING AN ESTIMATED 3 FT. THE PUSH CREW RPTED THERE WERE NO INJURIES AND THAT THE PARKING BRAKE SET LIGHT IN WHEEL WELL WAS ON. BRAKES ACTED NORMALLY AFTER THIS.
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.