Discussion
The classic hazard associated with an unstable spiral mode is
Answer: B
Left alone, the bank increases, the nose drops, speed builds and the turn tightens: a graveyard spiral, dangerous not because it develops quickly but because it develops unnoticed, especially without an external horizon. It is a distinct phenomenon from a spin, which requires stall and autorotation rather than a slow bank divergence. Pitch-up is a longitudinal high-incidence problem. Aileron effectiveness is unaffected: the controls work perfectly throughout, which is what makes the recovery straightforward once the condition is recognised.
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