Definition
The portion of a flight during which the airplane is transitioning from cruise altitude down toward the destination airport, typically at reduced power and with engine and cabin temperatures gradually changing as altitude decreases.
Plain English
The part of the flight where the airplane comes down from cruising altitude on the way to landing.
Context Anchor
Seen in engine heat management, descent planning, and checklist use before arriving at the airport.
Derivation
From the Latin descendere, meaning 'to climb down.' In flight, it simply names the segment where the airplane is coming down from altitude.
Why Pilots Care
Improper descent technique can cause engine damage from shock cooling, while correct management preserves engine life and maintains safe operating temperatures.
Intuition Check
Do not think of the descent phase as only the last few moments before landing. It can begin much earlier, when the pilot first starts bringing the airplane down from cruise altitude.
Example Sentence 1
During the descent phase, the pilot reduced power gradually to avoid cooling the cylinders too quickly.
Example Sentence 2
Proper planning for the descent phase includes selecting an appropriate descent rate that avoids both excessive speed and rapid engine cooling.