A da-50 annunciated trim and mistrim while climbing to 11;000 ft and so the autopilot did not automa...

Narrative:

This was an far 91 leg returning from an far 135 trip. Shortly after departure talking to departure we were given a climb to 11;000. I had been in the process of completing the after takeoff checklist when the pilot flying disconnected the ap and pushed the airplane over to recapture the assigned altitude. I noted our altitude was 11;800. Immediately after the pilot flying disconnected the autopilot; two warning messages illuminated. They were autopilot trim; and mistrim. In the da-50 when electric trim fails; the autopilot does not have pitch authority. However; it does not disconnect the autopilot. Therefore the autopilot tried to capture the altitude but was unable. We returned to altitude and continued our flight. ATC did not make any reference to our altitude. As we proceeded to our filed destination we continued troubleshooting the electric trim. It seemed to be operating at 1/2 speed if at all. We tried the autopilot one more time and after a brief period of time it was apparent it would not hold altitude. The trim was written up and maintenance was notified. As a possible contributing factor; the morning of the day before this trip we were assigned by 'hot standby.' we were required to sit at the airport for six hours with the APU running which means we had to be awake and ready to fly. I believe this contributed to our alertness. Even under a maintenance situation; pilot awareness is primarily. We should have noticed the altitude earlier. Departure is a busy phase of flight; heightened alertness is important.

Original NASA ASRS Text

Title: A DA-50 annunciated TRIM and MISTRIM while climbing to 11;000 FT and so the autopilot did not automatically capture the altitude; but overshot by 800 FT. Fatigue; task saturation and inexperience well elements in this event.

Narrative: This was an FAR 91 leg returning from an FAR 135 trip. Shortly after departure talking to Departure we were given a climb to 11;000. I had been in the process of completing the After Takeoff Checklist when the pilot flying disconnected the AP and pushed the airplane over to recapture the assigned altitude. I noted our altitude was 11;800. Immediately after the pilot flying disconnected the autopilot; two warning messages illuminated. They were autopilot TRIM; and MISTRIM. In the DA-50 when electric trim fails; the autopilot does not have pitch authority. However; it does not disconnect the autopilot. Therefore the autopilot tried to capture the altitude but was unable. We returned to altitude and continued our flight. ATC did not make any reference to our altitude. As we proceeded to our filed destination we continued troubleshooting the electric trim. It seemed to be operating at 1/2 speed if at all. We tried the autopilot one more time and after a brief period of time it was apparent it would not hold altitude. The trim was written up and Maintenance was notified. As a possible contributing factor; the morning of the day before this trip we were assigned by 'hot standby.' We were required to sit at the airport for six hours with the APU running which means we had to be awake and ready to fly. I believe this contributed to our alertness. Even under a maintenance situation; pilot awareness is primarily. We should have noticed the altitude earlier. Departure is a busy phase of flight; heightened alertness is important.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1083692
Time
Date	201304
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Falcon 50
Operating Under FAR Part	Part 91
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Elevator Trim System
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Altitude Overshoot Deviation - Procedural Clearance

A da-50 annunciated trim and mistrim while climbing to 11;000 ft and so the autopilot did not automatically capture the altitude; but overshot by 800 ft. Fatigue; task saturation and inexperience well elements in this event.