In view of the post above left by laundress
The Challenger 601 3A that I used to maintain had two GE CF34 high bypass turbofans on it, and they were excellent engines. If they had any weakness at all it was the micro-switches at either end of the cascade vane type thrust reverser's travel limits. The power to weight ratio on those aircraft is really impressive. For example, we had another Challenger out at the blast fence for an engine run up where we brought the engines to 95%. The two mechanics in the cockpit were both bearing down hard on the brakes, but it had rained a bit earlier and the asphalt was wet, so the aircraft literally began to slowly slide forward. I'd never seen that before so it caught me by surprise. I radioed the guys in the cockpit and they backed off the throttles long enough for me to jam some heavy rubber chocks in place in front of the mains. Problem solved, but still, very impressive. Occasional thrust reverser problems were the only issues I ever had with those engines.
[this post was last edited: 8/1/2014-01:08]