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Single pilot corporate small transport overshoots assigned altitude in climb by 400' due to loss of autoplt and primary flight instruments.
| Attributes | |
| ACN | 140542 |
| Time | |
| Date | 199003 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : tup |
| State Reference | MS |
| Altitude | msl bound lower : 10000 msl bound upper : 10400 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : cfi pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 130 flight time total : 3300 flight time type : 150 |
| ASRS Report | 140542 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
The reporter's turboprop small transport had been experiencing inverter problems and had had both inverters replaced immediately prior to this flight. The reporter departed tup for gwo, was IMC in climb with autoplt engaged, and had received clearance from mem ARTCC to maintain 10000'. At approximately 9600' the primary inverter failed, causing loss of attitude and dg as well as the autoplt function. Selection of the secondary inverter was not immediately successful. Pulling and resetting the inverter circuit breaker, followed by reselection of the secondary inverter, succeeded in restoring AC power and primary flight instruments. Distraction with the aircraft equipment problem coupled with loss of primary flight instruments and autoplt failure led to a 400' altitude overshoot. ARTCC controller questioned altitude, and reporter advised of equipment problem while recovering to 10000'. FAA is not investigating. Callback conversation with reporter revealed the following information. Callback conducted to supply information missing from torn original reporting form. No additional information was required.
Original NASA ASRS Text
Title: SINGLE PLT CORPORATE SMT OVERSHOOTS ASSIGNED ALT IN CLIMB BY 400' DUE TO LOSS OF AUTOPLT AND PRIMARY FLT INSTRUMENTS.
Narrative: THE RPTR'S TURBOPROP SMT HAD BEEN EXPERIENCING INVERTER PROBS AND HAD HAD BOTH INVERTERS REPLACED IMMEDIATELY PRIOR TO THIS FLT. THE RPTR DEPARTED TUP FOR GWO, WAS IMC IN CLB WITH AUTOPLT ENGAGED, AND HAD RECEIVED CLRNC FROM MEM ARTCC TO MAINTAIN 10000'. AT APPROX 9600' THE PRIMARY INVERTER FAILED, CAUSING LOSS OF ATTITUDE AND DG AS WELL AS THE AUTOPLT FUNCTION. SELECTION OF THE SECONDARY INVERTER WAS NOT IMMEDIATELY SUCCESSFUL. PULLING AND RESETTING THE INVERTER CB, FOLLOWED BY RESELECTION OF THE SECONDARY INVERTER, SUCCEEDED IN RESTORING AC PWR AND PRIMARY FLT INSTRUMENTS. DISTR WITH THE ACFT EQUIP PROB COUPLED WITH LOSS OF PRIMARY FLT INSTRUMENTS AND AUTOPLT FAILURE LED TO A 400' ALT OVERSHOOT. ARTCC CTLR QUESTIONED ALT, AND RPTR ADVISED OF EQUIP PROB WHILE RECOVERING TO 10000'. FAA IS NOT INVESTIGATING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. CALLBACK CONDUCTED TO SUPPLY INFO MISSING FROM TORN ORIGINAL RPTING FORM. NO ADDITIONAL INFO WAS REQUIRED.
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.