Decelerative forces can cause incapacitation to crew members.

Decelerative forces can cause incapacitation to crew members.

• A. True
• B. False
• C. It depends on velocity
• D. Not determinable

Answer: (A)

Decelerative forces deliver high g-loads to the body during rapid slowing, and the body’s ability to maintain brain perfusion and stable function can be overwhelmed. When deceleration is abrupt, blood can pool away from the brain and the eyes, leading to gray-out, tunnel vision, dizziness, confusion, or loss of consciousness, all of which constitute incapacitation. Musculoskeletal and barotrauma injuries are also more likely with strong deceleration, further compromising the crew’s ability to perform tasks. The key point isn’t the vehicle’s speed on its own, but how quickly the velocity changes and the resulting forces the body must endure; a slower deceleration can be tolerated, but a sudden, high-rate deceleration can incapacitate. Therefore, the statement is true.

Decelerative forces deliver high g-loads to the body during rapid slowing, and the body’s ability to maintain brain perfusion and stable function can be overwhelmed. When deceleration is abrupt, blood can pool away from the brain and the eyes, leading to gray-out, tunnel vision, dizziness, confusion, or loss of consciousness, all of which constitute incapacitation. Musculoskeletal and barotrauma injuries are also more likely with strong deceleration, further compromising the crew’s ability to perform tasks. The key point isn’t the vehicle’s speed on its own, but how quickly the velocity changes and the resulting forces the body must endure; a slower deceleration can be tolerated, but a sudden, high-rate deceleration can incapacitate. Therefore, the statement is true.