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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier light transport lost many of its flight instruments, then wandered off of its assigned altitude.
| Attributes | |
| ACN | 262914 |
| Time | |
| Date | 199401 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cvg |
| State Reference | OH |
| Altitude | msl bound lower : 14000 msl bound upper : 14700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340A |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zid |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | SF 340A |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : commercial pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 11000 flight time type : 5000 |
| ASRS Report | 262914 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
While level at 14000 ft, we experienced a left main bus electrical failure. This results in loss of captain's eadi, ehsi, altimeter, autoplt, TCASII/transponder. Since I was the PNF, the first officer took control of the aircraft. While maintaining altitude, we both began to fixate on my electric altimeter, which read 14000 ft. During this time the left main would come back on for a while. Once settling down and resetting the autoplt and transponder, things would be back to normal. 1-2 mins later the scenario would begin again! The first officer, while hand flying, drifted up to approximately 14700 ft. ZID called us to verify that we were still level at 14000 ft. I informed him of our electrical problem and were descending to 14000 ft. TCASII showed no aircraft plus/minus 1000 ft within 15 mi of our aircraft. This is a good case of not minding the store. I should have made sure that the first officer was flying the aircraft, while I was trouble-shooting the problem.
Original NASA ASRS Text
Title: AN ACR LTT LOST MANY OF ITS FLT INSTS, THEN WANDERED OFF OF ITS ASSIGNED ALT.
Narrative: WHILE LEVEL AT 14000 FT, WE EXPERIENCED A L MAIN BUS ELECTRICAL FAILURE. THIS RESULTS IN LOSS OF CAPT'S EADI, EHSI, ALTIMETER, AUTOPLT, TCASII/XPONDER. SINCE I WAS THE PNF, THE FO TOOK CTL OF THE ACFT. WHILE MAINTAINING ALT, WE BOTH BEGAN TO FIXATE ON MY ELECTRIC ALTIMETER, WHICH READ 14000 FT. DURING THIS TIME THE L MAIN WOULD COME BACK ON FOR A WHILE. ONCE SETTLING DOWN AND RESETTING THE AUTOPLT AND XPONDER, THINGS WOULD BE BACK TO NORMAL. 1-2 MINS LATER THE SCENARIO WOULD BEGIN AGAIN! THE FO, WHILE HAND FLYING, DRIFTED UP TO APPROX 14700 FT. ZID CALLED US TO VERIFY THAT WE WERE STILL LEVEL AT 14000 FT. I INFORMED HIM OF OUR ELECTRICAL PROB AND WERE DSNDING TO 14000 FT. TCASII SHOWED NO ACFT PLUS/MINUS 1000 FT WITHIN 15 MI OF OUR ACFT. THIS IS A GOOD CASE OF NOT MINDING THE STORE. I SHOULD HAVE MADE SURE THAT THE FO WAS FLYING THE ACFT, WHILE I WAS TROUBLE-SHOOTING THE PROB.
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.