Narrative:

While descending to 13000 ft, an inverter failed, creating a situation in which the captain was required to check a lower side panel for circuit breaker while running an abnormal checklist. I took over as PF because in the loss of the inverter, the autoplt failed. During a period of heavy workload and poor cockpit visibility due to glare, a mistake was made in interpreting the altimeter and our altitude of 13000 ft (assigned) was passed by 400 ft. Immediate action was taken to correct the altitude deviation. This situation could have been avoided by our increased attention to the aircraft flight path and crew coordination improvement. Too much attention was given to the electrical problem and not to the aircraft operation. Care should be taken not to let confusion take over the crew's attention. Adding to the situation was a glare in the instrumentation which made it difficult to see and immediately interpret the altimeter.

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Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT WHEN AN LR-31A FLT CREW IS DISTR BY A FAILED INVERTER ON DSCNT NEAR RINGR INTXN, TX.

Narrative: WHILE DSNDING TO 13000 FT, AN INVERTER FAILED, CREATING A SIT IN WHICH THE CAPT WAS REQUIRED TO CHK A LOWER SIDE PANEL FOR CIRCUIT BREAKER WHILE RUNNING AN ABNORMAL CHKLIST. I TOOK OVER AS PF BECAUSE IN THE LOSS OF THE INVERTER, THE AUTOPLT FAILED. DURING A PERIOD OF HVY WORKLOAD AND POOR COCKPIT VISIBILITY DUE TO GLARE, A MISTAKE WAS MADE IN INTERPRETING THE ALTIMETER AND OUR ALT OF 13000 FT (ASSIGNED) WAS PASSED BY 400 FT. IMMEDIATE ACTION WAS TAKEN TO CORRECT THE ALTDEV. THIS SIT COULD HAVE BEEN AVOIDED BY OUR INCREASED ATTN TO THE ACFT FLT PATH AND CREW COORD IMPROVEMENT. TOO MUCH ATTN WAS GIVEN TO THE ELECTRICAL PROB AND NOT TO THE ACFT OP. CARE SHOULD BE TAKEN NOT TO LET CONFUSION TAKE OVER THE CREW'S ATTN. ADDING TO THE SIT WAS A GLARE IN THE INSTRUMENTATION WHICH MADE IT DIFFICULT TO SEE AND IMMEDIATELY INTERPRET THE ALTIMETER.

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.