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Flight crew of a B727 return to the gate after starting the #1 and #2 engines and all 3 bus tie breakers tripped. It was later found by maintenance to be caused by the #1 engine generator.
| Attributes | |
| ACN | 429578 |
| Time | |
| Date | 199902 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : atl.airport |
| State Reference | GA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : holding |
| 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 : 160 flight time total : 10500 flight time type : 3500 |
| ASRS Report | 429578 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
After starting #1 and #2 engines, generators paralleled then all 3 bus tie breakers tripped. Reset, tried it again, and breakers tripped again. Called ramp tower to return to gate. They told us to contact maintenance first and that maintenance would coordinate gate return. It seems that this is a company ploy to discourage returns to gate and to simply maintenance carryover items in the name of on time. Told ramp tower troubleshooting needed to be performed by maintenance, to no avail. Talked to maintenance, after a delay, we returned to gate. At first, a bad pack fan was suspected, but subsequently, after more troubleshooting, the #1 generator was put on maintenance carryover and disconnected, and we departed.
Original NASA ASRS Text
Title: FLC OF A B727 RETURN TO THE GATE AFTER STARTING THE #1 AND #2 ENGS AND ALL 3 BUS TIE BREAKERS TRIPPED. IT WAS LATER FOUND BY MAINT TO BE CAUSED BY THE #1 ENG GENERATOR.
Narrative: AFTER STARTING #1 AND #2 ENGS, GENERATORS PARALLELED THEN ALL 3 BUS TIE BREAKERS TRIPPED. RESET, TRIED IT AGAIN, AND BREAKERS TRIPPED AGAIN. CALLED RAMP TWR TO RETURN TO GATE. THEY TOLD US TO CONTACT MAINT FIRST AND THAT MAINT WOULD COORDINATE GATE RETURN. IT SEEMS THAT THIS IS A COMPANY PLOY TO DISCOURAGE RETURNS TO GATE AND TO SIMPLY MAINT CARRYOVER ITEMS IN THE NAME OF ON TIME. TOLD RAMP TWR TROUBLESHOOTING NEEDED TO BE PERFORMED BY MAINT, TO NO AVAIL. TALKED TO MAINT, AFTER A DELAY, WE RETURNED TO GATE. AT FIRST, A BAD PACK FAN WAS SUSPECTED, BUT SUBSEQUENTLY, AFTER MORE TROUBLESHOOTING, THE #1 GENERATOR WAS PUT ON MAINT CARRYOVER AND DISCONNECTED, AND WE DEPARTED.
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.