Super King Air 200
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Engineer; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Returned To Gate; General Flight Cancelled / Delayed
Aircraft; Procedure
On taxi out to Runway XY we smelled a plastic burning smell. I also saw a little haze in the cabin. I shut the air conditioning off (the bleed air was not on yet) and told Ground we had a problem and wanted to return to the ramp. Shutting off the aircraft didn't help so I decided to shut down the airplane and get everyone off. I told Ground I was shutting down and requested assistance.No one was injured and no sign of fire. The flap limit switch was set incorrectly and the flap motor overheated.
BE20 pilot reported detecting a burning plastic smell on taxi. After shutdown; the odor was attributed to an overheated flap motor.