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During taxi for takeoff; an A320's rt gen dropped off line and after 15 seconds transferred the lt gen with a loud noise.
| Attributes | |
| ACN | 801286 |
| Time | |
| Date | 200808 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Controlling Facilities | tower : tus.tower |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : taxi |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 13500 flight time type : 4400 |
| ASRS Report | 801286 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
On taxi out for takeoff; the right generator dropped off the line. The right AC bus failed to transfer for approximately 15 seconds. Multiple ecams appeared in rapid succession along with the fire warning light and bell for the number 2 engine (the aircraft was dispatched with fire warning loop a on the number 2 engine inoperative and the remaining loop activated with the subsequent loss of power). The ecams and the fire warnings disappeared when the right AC bus transferred to the left generator. Only the ECAM for the right generator remained. This transfer was accompanied with a louder than normal relay noise. We contacted maintenance and decided to return to the gate without resetting the right generator. We did restart the APU and as the APU picked up the load of the right AC bus there was again a very loud transfer noise. We returned to the gate and turned the aircraft over to maintenance. This aircraft had a previous event of a similar nature with the right AC bus that did not appear in the printable aircraft history.
Original NASA ASRS Text
Title: DURING TAXI FOR TKOF; AN A320'S RT GEN DROPPED OFF LINE AND AFTER 15 SECONDS TRANSFERRED THE LT GEN WITH A LOUD NOISE.
Narrative: ON TAXI OUT FOR TAKEOFF; THE RIGHT GENERATOR DROPPED OFF THE LINE. THE RIGHT AC BUS FAILED TO TRANSFER FOR APPROXIMATELY 15 SECONDS. MULTIPLE ECAMS APPEARED IN RAPID SUCCESSION ALONG WITH THE FIRE WARNING LIGHT AND BELL FOR THE NUMBER 2 ENGINE (THE AIRCRAFT WAS DISPATCHED WITH FIRE WARNING LOOP A ON THE NUMBER 2 ENGINE INOPERATIVE AND THE REMAINING LOOP ACTIVATED WITH THE SUBSEQUENT LOSS OF POWER). THE ECAMS AND THE FIRE WARNINGS DISAPPEARED WHEN THE RIGHT AC BUS TRANSFERRED TO THE LEFT GENERATOR. ONLY THE ECAM FOR THE RIGHT GENERATOR REMAINED. THIS TRANSFER WAS ACCOMPANIED WITH A LOUDER THAN NORMAL RELAY NOISE. WE CONTACTED MAINT AND DECIDED TO RETURN TO THE GATE WITHOUT RESETTING THE RIGHT GENERATOR. WE DID RESTART THE APU AND AS THE APU PICKED UP THE LOAD OF THE RIGHT AC BUS THERE WAS AGAIN A VERY LOUD TRANSFER NOISE. WE RETURNED TO THE GATE AND TURNED THE AIRCRAFT OVER TO MAINTENANCE. THIS AIRCRAFT HAD A PREVIOUS EVENT OF A SIMILAR NATURE WITH THE RIGHT AC BUS THAT DID NOT APPEAR IN THE PRINTABLE AIRCRAFT HISTORY.
Data retrieved from NASA's ASRS site as of May 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.