Definition
An aircraft attitude in which the wings are tilted 45 degrees from level relative to the horizon, measured as the angle between the aircraft's lateral axis and the horizontal plane. In the context of spatial disorientation demonstrations, this bank angle is established and held to expose how the inner ear can fail to detect prolonged, steady banking and instead perceive the aircraft as level.
Plain English
The aircraft is tilted sideways so that its wings are halfway between level and straight up-and-down. One wing is pointing noticeably down toward the ground; the other is pointing up toward the sky.
Context Anchor
Seen in instrument flying training, especially during demonstrations of spatial disorientation when a pilot may not feel a bank correctly without looking at the instruments.
Derivation
Attitude in aviation means the airplane’s position compared with the horizon, not a person’s mood. Bank comes from the idea of sloping or tilting to one side, which matches how an airplane’s wings tilt during a bank.
Why Pilots Care
Demonstrates how the inner ear can mislead a pilot about actual aircraft position without visual references.
Grounding Statement
If you looked at the airplane from behind, the wings would form a clear diagonal line instead of a level line.
Intuition Check
Attitude does not mean mood here; it means the airplane’s position compared with the horizon. A 45° bank attitude is about side tilt, not about the pilot’s mindset.
Example Sentence 1
The instructor established a 45° bank attitude and held it for about 90 seconds so the student could feel how the sensation of turning fades.
Example Sentence 2
Holding a steady 45° bank attitude in the turn requires smooth aileron and rudder coordination.