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An MD83 first officer noted battery charger light on when captain left his seat after removing and stowing oxygen mask. Found mask microphone cord tripped battery charger circuit breaker.
| Attributes | |
| ACN | 614488 |
| Time | |
| Date | 200404 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : dta.vortac |
| State Reference | UT |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc tower : dfw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-83 |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 614488 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : battery charger light other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Returning from a trip to the lavatory during cruise, the first officer told me that the battery charger light on the annunciator panel was observed to be on during my time away from the cockpit and that the battery charger circuit breaker was found popped. The emergency procedure calls for a landing at the nearest suitable airport. However, in discussion, the conclusion was that the circuit breakers was inadvertently pulled as I donned my oxygen mask when the first officer went to the lavatory mins prior. The oxygen mask microphone wire evidently got caught on the circuit breaker which is in a fairly vulnerable location on the circuit breaker panel. All other electrical system indications were normal including zero amp draw and normal voltage on the ship's battery. I elected to continue to sfo. Flight was in day VMC. Landed normally in sfo.
Original NASA ASRS Text
Title: AN MD83 FO NOTED BATTERY CHARGER LIGHT ON WHEN CAPT LEFT HIS SEAT AFTER REMOVING AND STOWING OXYGEN MASK. FOUND MASK MIKE CORD TRIPPED BATTERY CHARGER CIRCUIT BREAKER.
Narrative: RETURNING FROM A TRIP TO THE LAVATORY DURING CRUISE, THE FO TOLD ME THAT THE BATTERY CHARGER LIGHT ON THE ANNUNCIATOR PANEL WAS OBSERVED TO BE ON DURING MY TIME AWAY FROM THE COCKPIT AND THAT THE BATTERY CHARGER CIRCUIT BREAKER WAS FOUND POPPED. THE EMER PROC CALLS FOR A LNDG AT THE NEAREST SUITABLE ARPT. HOWEVER, IN DISCUSSION, THE CONCLUSION WAS THAT THE CIRCUIT BREAKERS WAS INADVERTENTLY PULLED AS I DONNED MY OXYGEN MASK WHEN THE FO WENT TO THE LAVATORY MINS PRIOR. THE OXYGEN MASK MIKE WIRE EVIDENTLY GOT CAUGHT ON THE CIRCUIT BREAKER WHICH IS IN A FAIRLY VULNERABLE LOCATION ON THE CIRCUIT BREAKER PANEL. ALL OTHER ELECTRICAL SYS INDICATIONS WERE NORMAL INCLUDING ZERO AMP DRAW AND NORMAL VOLTAGE ON THE SHIP'S BATTERY. I ELECTED TO CONTINUE TO SFO. FLT WAS IN DAY VMC. LANDED NORMALLY IN SFO.
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.