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Flight crew of a cessna citation ii C550 drifted off assigned altitude during arrival descent resulting in ATC questioning their altitude and them recognizing their error. They returned to assigned and wrote up the autoplt hold in the aircraft log since it had disengaged causing the excursion.
| Attributes | |
| ACN | 406920 |
| Time | |
| Date | 199806 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : cmh |
| State Reference | OH |
| Altitude | msl bound lower : 10500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 290 flight time total : 4000 flight time type : 400 |
| ASRS Report | 406920 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The captain and I were deviating around heavy thunderstorms and rain. We were looking at the radar. We were in IMC and heavy rain. The autoplt did not catch the altitude. The autoplt was disengaging at times during the flight. Center asked what was our assigned altitude. Upon replying, I noticed we were several hundred ft off altitude. We corrected the altitude. 1 pilot should always be looking at the instruments, monitoring the aircraft. (The autoplt was disengaging for some reason, the captain wrote up autoplt, it was fixed that night.)
Original NASA ASRS Text
Title: FLC OF A CESSNA CITATION II C550 DRIFTED OFF ASSIGNED ALT DURING ARR DSCNT RESULTING IN ATC QUESTIONING THEIR ALT AND THEM RECOGNIZING THEIR ERROR. THEY RETURNED TO ASSIGNED AND WROTE UP THE AUTOPLT HOLD IN THE ACFT LOG SINCE IT HAD DISENGAGED CAUSING THE EXCURSION.
Narrative: THE CAPT AND I WERE DEVIATING AROUND HVY TSTMS AND RAIN. WE WERE LOOKING AT THE RADAR. WE WERE IN IMC AND HVY RAIN. THE AUTOPLT DID NOT CATCH THE ALT. THE AUTOPLT WAS DISENGAGING AT TIMES DURING THE FLT. CTR ASKED WHAT WAS OUR ASSIGNED ALT. UPON REPLYING, I NOTICED WE WERE SEVERAL HUNDRED FT OFF ALT. WE CORRECTED THE ALT. 1 PLT SHOULD ALWAYS BE LOOKING AT THE INSTS, MONITORING THE ACFT. (THE AUTOPLT WAS DISENGAGING FOR SOME REASON, THE CAPT WROTE UP AUTOPLT, IT WAS FIXED THAT NIGHT.)
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.