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Commuter mdt experiences a bunch of electrical gremlins causing autoplt failure. A 400' altitude deviation results.
| Attributes | |
| ACN | 134768 |
| Time | |
| Date | 199001 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 11000 msl bound upper : 11400 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air taxi |
| Make Model Name | Medium Transport, High Wing, 2 Turboprop Eng |
| Flight Phase | cruise other descent other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 5500 flight time type : 3000 |
| ASRS Report | 134768 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
This is one of those 'everything happens at once situations.' while joining the arrival into atl, a warning light in the cockpit indicated that our auxiliary nicad battery was in an overheat condition. We declared an emergency with atl approach control and myself and the first officer then performed the emergency checklist procedure. After performing the checklist, the first officer went to company frequency to inform flight control of our status. At this time I called an F/a to the cockpit to brief her on emergency procedures. While talking to the F/a, the #1 flight guidance computer failed, along with the yaw damper and autoplt system. The #2 autoplt system did not engage after system 1 failure, so for a brief period the aft climbed to 400' above our assigned altitude. Our airspeed was 230 KTS indicated airspeed at the time, so a slight pitch produced a rapid rate of climb. I quickly leveled the aircraft back to assigned altitude, and heard no comment from altitude approach control.
Original NASA ASRS Text
Title: COMMUTER MDT EXPERIENCES A BUNCH OF ELECTRICAL GREMLINS CAUSING AUTOPLT FAILURE. A 400' ALT DEVIATION RESULTS.
Narrative: THIS IS ONE OF THOSE 'EVERYTHING HAPPENS AT ONCE SITUATIONS.' WHILE JOINING THE ARR INTO ATL, A WARNING LIGHT IN THE COCKPIT INDICATED THAT OUR AUX NICAD BATTERY WAS IN AN OVERHEAT CONDITION. WE DECLARED AN EMER WITH ATL APCH CTL AND MYSELF AND THE F/O THEN PERFORMED THE EMER CHKLIST PROC. AFTER PERFORMING THE CHKLIST, THE F/O WENT TO COMPANY FREQ TO INFORM FLT CTL OF OUR STATUS. AT THIS TIME I CALLED AN F/A TO THE COCKPIT TO BRIEF HER ON EMER PROCS. WHILE TALKING TO THE F/A, THE #1 FLT GUIDANCE COMPUTER FAILED, ALONG WITH THE YAW DAMPER AND AUTOPLT SYS. THE #2 AUTOPLT SYS DID NOT ENGAGE AFTER SYS 1 FAILURE, SO FOR A BRIEF PERIOD THE AFT CLBED TO 400' ABOVE OUR ASSIGNED ALT. OUR AIRSPD WAS 230 KTS INDICATED AIRSPD AT THE TIME, SO A SLIGHT PITCH PRODUCED A RAPID RATE OF CLB. I QUICKLY LEVELED THE ACFT BACK TO ASSIGNED ALT, AND HEARD NO COMMENT FROM ALT APCH CTL.
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.