20. Flying in IFR in non-radar environment and experience two way radio communication failure what airspeed should you fly? A. Flight plan airspeed B. Expect further clearance speed C. Fly for 20 minutes at current speed then resume flight plan speed D. Fly for 30 minutes at current speed then resume flight plan speed 21. What is the minimum flight altitude in IFR within mountainous area ? A. 30..