Plain English Meaning
Flying along straight and level at your usual cruising speed and power, not climbing, descending, or turning.
Full Definition
A steady, level phase of flight at the airplane's typical cruise power setting and airspeed, with wings level and no climb, descent, or maneuvering being performed.
Context Anchor
In the Steep Spiral section, this describes the ordinary flight condition a pilot may be in before setting up or entering the maneuver.
Derivation
Normal comes from an older word meaning a rule or . originally carried the idea of traveling around or along a . Together, the phrase points to the airplane’s standard traveling condition in flight.