T-6 Aerospace Physiology Practice Test 2026 – Comprehensive Exam Prep

The correct duration for flight restriction after exposure to compressed air is 24 hours. This policy is in place primarily to prevent decompression sickness, which can occur when an individual who has been subjected to increased atmospheric pressure suddenly transitions to lower pressure, such as in flight.

When a person is exposed to compressed air, nitrogen and other gases dissolve into their tissues under higher pressure. If they ascend to a lower pressure environment too quickly, these gases can form bubbles in the body's tissues and bloodstream, leading to potentially serious health issues. The 24-hour waiting period allows sufficient time for the excess gases to safely dissipate from the body, thereby reducing the risk of developing decompression sickness prior to flying.

This policy is crucial for maintaining aircrew safety and ensuring that all personnel are fit to fly after such exposure.