Definition
A turn flown with the aircraft banked thirty degrees from level, used as a standard reference bank during instrument flight for normal heading changes. At this bank angle and typical training airspeeds, the aircraft turns at approximately a standard rate (3° per second), allowing the pilot to time turns precisely and predict roll-out headings while flying solely by reference to instruments.
Plain English
A turn where the wings are tilted thirty degrees from level. It's the everyday turn used in instrument flying because it gives a steady, predictable rate of turn that's easy to plan and fly accurately.
Context Anchor
Seen in instrument flying training when practicing controlled turns by reference to the flight instruments.
Derivation
Bank originally referred to a slope or raised edge. In aviation, it came to describe the airplane tilting sideways, as if leaning into a turn. That helps because a 30° bank turn is about the airplane’s sideways tilt, not how far around the compass it turns.
Why Pilots Care
Allows precise, predictable heading changes during instrument flight without inducing excessive g-forces or spatial disorientation.
Intuition Check
Do not read “30°” as a 30-degree change in direction. It means the wings are tilted 30 degrees from level during the turn. “Bank” here does not mean money or a river edge; it means the aircraft’s sideways tilt.
Example Sentence 1
Approaching the holding fix, the pilot rolled into a 30° bank turn to enter the hold on the inbound course.
Example Sentence 2
At 30° bank the turn rate remained standard, completing 180 degrees in one minute.