The BE1900D is a piece of junk.

The Maintenance Manuals are full of errors (at least one fatal accidents list the manual as factors in the probable cause) and the systems are a weak at best. The printed circuit boards are a joke. Flaps have already been mentioned as well as the prop ground solenoid. The pressurization system is one of the worst I have seen. The landing gear warning horn is useless, they might as well have just made it go off all the time...... The EVA tubing is a joke. If you leave the props in feather while on the ground with engines running, the windows will melt out. It idles at an unbelievable high 67 to 72 % N1 to avoid ground resonance which makes it an absolute blast to taxi on slick surfaces. Best part, the props love to penetrate the fuselage in an incident or accident sequence. Do not sit in row 1 or 2!!!!! Of the 30 accidents listed in the database, the prop(s) penetrated the fuselage 6 times.

Oh yeah, they published an AD on the ailerons recently that had to be complied with but there was not enough parts for the operators to fix the issue. Beechcraft had to scramble and come up with an alternate means of compliance. Some aircraft had to sit on the ground for a week waiting for beechcraft to figure out what to do...

Beechcraft should have stayed out of the airline world.

I can't believe the Feds certified the airplane.

Edit ( If beechcraft would have spent a little more time addressing some of the issues described, they would have had a great airplane. But it seems rushed and not completely thought out. The -67 engines are great except for the high idle mentioned above.)