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Autoplt performs uncommanded 60 degree bank and pitch down causing reporter to deviate from course and altitude.
| Attributes | |
| ACN | 318930 |
| Time | |
| Date | 199510 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zob |
| State Reference | OH |
| Altitude | msl bound lower : 14000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air taxi |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : cfi pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 1800 flight time type : 100 |
| ASRS Report | 318930 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : far non adherence : clearance other spatial deviation |
| Independent Detector | other other : unspecified cockpit |
| 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 | other |
Narrative:
I was given an amended clearance en route, to RNAV direct to an intersection. I was having problems with the RNAV and asked the controller for a heading. I set the autoplt up on the heading and engaged it. Immediately the plane rolled into a 60 degree bank to the right and pitched down. Before I could shut off the autoplt I had turned 60 degrees. Attempting to get back on course I was inquired about my heading. Then was given a new heading for traffic and told I was north of my expected course. Once back direct to the intersection I was switched to detroit approach. I should have let ATC know about the autoplt problem and asked for a new heading on course. The RNAV problem and autoplt problem was combined with the night IFR, moderate turbulence, and moderate rime ice. The high pilot workload may have accentuated the situation.
Original NASA ASRS Text
Title: AUTOPLT PERFORMS UNCOMMANDED 60 DEG BANK AND PITCH DOWN CAUSING RPTR TO DEVIATE FROM COURSE AND ALT.
Narrative: I WAS GIVEN AN AMENDED CLRNC ENRTE, TO RNAV DIRECT TO AN INTXN. I WAS HAVING PROBS WITH THE RNAV AND ASKED THE CTLR FOR A HDG. I SET THE AUTOPLT UP ON THE HDG AND ENGAGED IT. IMMEDIATELY THE PLANE ROLLED INTO A 60 DEG BANK TO THE R AND PITCHED DOWN. BEFORE I COULD SHUT OFF THE AUTOPLT I HAD TURNED 60 DEGS. ATTEMPTING TO GET BACK ON COURSE I WAS INQUIRED ABOUT MY HDG. THEN WAS GIVEN A NEW HDG FOR TFC AND TOLD I WAS N OF MY EXPECTED COURSE. ONCE BACK DIRECT TO THE INTXN I WAS SWITCHED TO DETROIT APCH. I SHOULD HAVE LET ATC KNOW ABOUT THE AUTOPLT PROB AND ASKED FOR A NEW HDG ON COURSE. THE RNAV PROB AND AUTOPLT PROB WAS COMBINED WITH THE NIGHT IFR, MODERATE TURB, AND MODERATE RIME ICE. THE HIGH PLT WORKLOAD MAY HAVE ACCENTUATED THE SIT.
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.