Originally Posted by
flyboyike
Never flown the Challenger itself, but have flown three of its derivatives (CRJ-200/700/900). For all three of them, partial or no-flap landings were practiced in the simulator regularly. Just as well, because the -100/200, for example, had a habit of experiencing flap failures, while on the -900 I had one case of a slat failure. Furthermore, for all of those aircraft single-engine landings are made with Flaps 20, which is also the case for landings with a pitch trim failure.
Over the past 5 years we've had 3 separate instances of commuter CRJ-200s having to make no-flap landings at my local upstate New York airport. All had non-eventful outcomes, though emergencies were declared in each case, with fire and rescue equipment standing by.
All three flights originated in Detroit, and all the flap failures occurred in winter. Apparently the 200 model had issues with flap position microswitches freezing up due to water/slush ingress into the flap bays - usually on the preceding takeoff, leading to a flap system failure when the crew tried to deploy them during the approach.
The carrier has since retired all of their 200s in favor of CRJ-700s which don't seem to have that particular problem.