Definition
The brief interval during a maneuver change when the aircraft is moving from one stable flight condition to another, requiring active control inputs and trim adjustments before settling into the new condition.
Plain English
The short window between one steady flight setup and the next, when things are still changing and the aircraft hasn't settled down yet.
Context Anchor
Seen when adjusting trim, leveling off, changing airspeed, entering a climb, or entering a descent during instrument flight.
Derivation
From Latin transire, 'to go across.' A transition is the act of crossing from one state to another. The 'period' is simply the time it takes to make that crossing.
Why Pilots Care
Failing to anticipate trim needs in this phase leads to increasing control pressure, overcontrol, and unstable instrument flight.
Grounding Statement
The transitional period is the brief settling time between making a change and seeing the airplane hold the new condition steadily.
Intuition Check
Do not read transitional period as a large phase of training or a long stage of flight. Here it means the short in-between interval while the airplane changes from one steady condition to another.
Example Sentence 1
During the transitional period from level flight to the climb, the pilot held the new attitude on the attitude indicator while the airspeed slowly bled back to climb speed.
Example Sentence 2
The pilot recognized the start of the transitional period on entering the descent and adjusted trim before control forces became noticeable.