Descent Groundspeed Thrust 
Air Facts
MAY 10, 2024
Perhaps just prior to the start of descent could be the optimum time–certainly completed no later than commencement of approach. For example, some aircraft limit flaps and gear in icing until on approach or forbid the use of speed brakes or require a minimum thrust setting. The rule of thumb is VSI = ½ groundspeed times 10.
Pilot Institute
FEBRUARY 25, 2025
Glide control and approach management are life-saving without engine thrust. When your aircraft loses thrust, youll have to glide it safely to the ground using only aerodynamic control. When the engine is running, the propeller is in motion, actively generating thrust. Doubling your groundspeed quadruples the impact force.
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