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A DC10-30F on preflight was found to have an open phase on the ground service bus rendering the cargo compartment lighting inoperative, caused by failure of the remote control circuit breaker and control breaker for phase 'B.'
| Attributes | |
| ACN | 411273 |
| Time | |
| Date | 199808 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz |
| State Reference | US |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 30F |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 60 flight time total : 5000 flight time type : 2000 |
| ASRS Report | 411273 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Aircraft developed electrical malfunction during preflight. Mechanic deactivated affected circuit and released flight using MEL provisions. Down line mechanic stated that releasing mechanic's signoff of write-up and release of aircraft were inappropriate and that the 'FAA is getting involved.' original mechanic's signoff and release appeared to be both safe and legal under our MEL. If this proves to not be the case, then both pilots and mechanics need more training in MEL usage visibility-a-visibility this electrical problem and the MEL needs to be clarified. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a DC10-30F and the problem was an open phase on the ground service bus. The reporter said the decision to defer the item was sound and met all the MEL requirements. The reporter stated maintenance found the 'B' phase remote control breaker and the control breaker failed.
Original NASA ASRS Text
Title: A DC10-30F ON PREFLT WAS FOUND TO HAVE AN OPEN PHASE ON THE GND SVC BUS RENDERING THE CARGO COMPARTMENT LIGHTING INOP, CAUSED BY FAILURE OF THE REMOTE CTL CIRCUIT BREAKER AND CTL BREAKER FOR PHASE 'B.'
Narrative: ACFT DEVELOPED ELECTRICAL MALFUNCTION DURING PREFLT. MECH DEACTIVATED AFFECTED CIRCUIT AND RELEASED FLT USING MEL PROVISIONS. DOWN LINE MECH STATED THAT RELEASING MECH'S SIGNOFF OF WRITE-UP AND RELEASE OF ACFT WERE INAPPROPRIATE AND THAT THE 'FAA IS GETTING INVOLVED.' ORIGINAL MECH'S SIGNOFF AND RELEASE APPEARED TO BE BOTH SAFE AND LEGAL UNDER OUR MEL. IF THIS PROVES TO NOT BE THE CASE, THEN BOTH PLTS AND MECHS NEED MORE TRAINING IN MEL USAGE VIS-A-VIS THIS ELECTRICAL PROB AND THE MEL NEEDS TO BE CLARIFIED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A DC10-30F AND THE PROB WAS AN OPEN PHASE ON THE GND SVC BUS. THE RPTR SAID THE DECISION TO DEFER THE ITEM WAS SOUND AND MET ALL THE MEL REQUIREMENTS. THE RPTR STATED MAINT FOUND THE 'B' PHASE REMOTE CTL BREAKER AND THE CTL BREAKER FAILED.
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.