Mastering Cruise Descents

Lets fire up the Wayback machine and set it for high school physics class. As an aircraft climbs, it burns fuel (and by extension, money) to provide kinetic energy. That energy is used for climb performance and airspeed (countering that demon drag in the process). Once the aircraft is tucked away at a cruise altitude, some of that formerly-kinetic energy is available as potential energy due to the force of gravity acting on the aircraft. Potential energy can be converted back into kinetic energy by initiating a descent, which you can observe as increasing airspeed (all else remaining equal).

Editorial Staff

Wednesday, December 03, 2014 at 12:00 AM ET

Verified

Key Takeaways:

Many pilots inefficiently manage aircraft descents, failing to convert stored potential energy into useful kinetic energy (airspeed).
The article advocates for "cruise power descents," where pilots maintain higher power settings during descent to increase airspeed, particularly beneficial in high-performance aircraft.
This strategy saves time and money, and potentially benefits engine health by preventing shock cooling, contrasting with common reduced-power descents.
Effective descent planning involves simple mental math for calculating start points and strategic communication with ATC (e.g., requesting "pilot's discretion" descents) for maximum flexibility.

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Let’s fire up the Wayback machine and set it for high school physics class. As an aircraft climbs, it burns fuel (and by extension, money) to provide kinetic energy. That energy is used for climb performance and airspeed (countering that demon drag in the process). Once the aircraft is tucked away at a cruise altitude, some of that formerly-kinetic energy is available as potential energy due to the force of gravity acting on the aircraft. Potential energy can be converted back into kinetic energy by initiating a descent, which you can observe as increasing airspeed (all else remaining equal).