What sequence of actions is appropriate when you suspect hypoxia?

• A. Don your oxygen mask and assist him in donning his. Declare an emergency with ATC and descend to 10,000 feet. Hypoxia
• B. Ignore and continue
• C. Switch to emergency power
• D. Land immediately

Answer: (A)

Hypoxia robs the brain of oxygen, so the first priority is restoring oxygenation and keeping the crew able to think and act. Put on your own oxygen mask and help the other person don theirs so both of you regain adequate oxygen quickly. Once oxygen is being supplied, declare an emergency to ATC to get priority in the system and to receive vectors or assistance as you manage the situation. Then initiate a controlled descent to a safer altitude, such as 10,000 feet, to improve the cabin/cockpit oxygen environment and reduce the risk of further impairment while you continue to fly and communicate.

This sequence directly addresses the immediate physiological need and the operational requirements: you restore oxygen, ensure the other person is protected, secure priority with air traffic control, and descend to a level where oxygen sufficiency is reliable. Ignoring the problem, switching to power systems alone, or attempting to land without first addressing oxygen and communication would leave you cognitively impaired and unable to handle the situation safely.