Final answer:
The manual override handle in an ejection seat rotates various components and can have dangerous consequences when used inflight.
Step-by-step explanation:
The subject of this question is Engineering.
When the manual override handle is pulled, it automatically rotates the ejection seat safe/armed handle to the safe position, releases the survival kit attachment lugs and leg restraint lines, and unlocks the inertia reel. If this is done inflight, the aircrew will be injured or killed.