Definition 1 of 2
Definition
A tightening, descending turn that develops when a pilot, flying without outside visual references, fails to recognize a prolonged bank and continues to lose altitude while the airspeed and rate of descent increase. The pilot's inner ear no longer senses the bank, so the aircraft is perceived as flying straight and level even though it is in a steep, accelerating spiral toward the ground.
Plain English
A slow, unnoticed turn that keeps tightening and descending until the aircraft is diving in a tight circle. The pilot doesn't feel the bank because the body adjusts to it, so the spiral keeps getting worse unless the instruments are trusted and the bank is corrected.
Context Anchor
Seen in instrument training, night flying, flight in clouds, and accident discussions involving loss of visual reference.
Derivation
Called a 'graveyard' spiral because it has historically been one of the most common fatal outcomes when pilots without instrument training fly into clouds or night conditions and lose outside reference.
Why Pilots Care
Without prompt recognition on the attitude indicator and immediate recovery, the spiral ends in an uncontrolled descent and impact.
Grounding Statement
Picture flying at night with no clear horizon: the airplane slowly enters a turn, starts descending, and the pilot feels level even though the instruments show a bank and altitude loss.
Intuition Check
A graveyard spiral is not the same as a spin. In a graveyard spiral, the airplane is still flying but is in a steepening descending turn; in a spin, the wing is stalled.
Example Sentence 1
After entering the cloud layer, the VFR pilot became disoriented and entered a graveyard spiral before regaining control on instruments.
Example Sentence 2
Night flight over dark terrain can quickly turn into a graveyard spiral if the pilot relies on body sensations instead of instruments.