Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 100; Flight Crew Total 7200; Flight Crew Type 100
Human-Machine Interface; Workload; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Maintenance
Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft; Company Policy; Procedure
I departed ZZZ for ZZZ1 and comes to 3;200 ft. direct to the ZZZZZ intersection. Upon leveling off at 3;200 ft. I turned on the autopilot to complete some paperwork. After about 10 minutes the Controller asked what altitude are you at? At this point the autopilot had turned off with no warning. I flew the rest of the day with the autopilot off. The next day when the preflight test was done the trim warnings would not silence. At that point our mechanic inspected the system and then implemented MEL documentation. Subsequent IFR flights have been a challenge being a 100 hour Captain. I has been rough maintaining standards when operating as a single pilot. Then compound all that with system failures. I have been operating for two weeks now without an autopilot.
C208 Captain reported auto pilot and trim warning failure resulted in workload challenge on subsequent IFR flights.