[Jim Smith]

I've had gear door problems occur on both my D and F models. Because of the somewhat unreliable operation of this type of system (similar to the 210), I've made it a habit (part of my unofficial checklist) to confirm in my convex mirrors the gear has fully retracted and doors closed after raising the gear handle. Also (only applicable on pre-73 models), I keep my hand on the gear handle until it drops into the neutral detent and I know it's completed its cycle. There's been a few times the gear handle stayed up and the pump kept running and didn't realize it until I could smell the pump starting to overheat.