A-1. All personnel must have a current flight physical and a current DA Form 4186 (Medical Recommendation for Flying Duty) indicating FFD before participating in any hypobaric chamber exercise.

A-2. The purpose of hypobaric chamber training is to safely demonstrate—

• Crew-member limitations associated with hypoxia at altitude.
• Effects of trapped-gas problems on the body.
• Effects of hypoxia on night vision.
• Capabilities of oxygen equipment.

A-3. Figures A-1 through A-5 show the standard flight chamber profiles. For information regarding nonstandard profiles, contact USASAM, ATTN MCCS-HA, Fort Rucker, Alabama 36362-5377.

The procedures for the profile in Figure A-1 are as follows:

• Begin 30-minute denitrogenation.
• Perform 5,000-foot ear and sinus check by 2,500 feet per minute.
• Ascend main accumulator, and lock to 8,000 feet by 2,500 feet per minute.
• Ascend main accumulator, and lock to 18,000 feet by 5,000 feet per minute.
• Perform running break of main accumulator and lock; maintain lock at 18,000 feet.
• Continue main accumulator ascent to 35,000 feet by 5,000 feet per minute.
• Descend main accumulator to 30,000 feet for 90-second hypoxia demonstration.
• Descend main accumulator, and lock to 25,000 feet by 5,000 feet per minute.
• Begin five-minute hypoxia demonstration.
• Descend lock to ground level by 5,000 feet per minute.
• Descend main accumulator to 18,000 feet by 5,000 feet per minute for night-vision demonstration.
• Descend main accumulator from 18,000 feet to ground level by 2,500 feet per minute.
• Terminate chamber flight.

The procedures for the profile in Figure A-2 are as follows:

• Begin 30-minute denitrogenation.
• Perform 5,000 feet ear and sinus check by 2,500 feet per minute.
• Ascend main accumulator from ground level to 8,000 feet by 2,500 feet per minute.
• Ascend main accumulator from 8,000 feet to 25,000 feet by 5,000 feet per minute.
• Begin five-minute hypoxia demonstration.
• Descend main accumulator from 25,000 feet to 18,000 feet by 5,000 feet per minute for night-vision demonstration.
• Descend main accumulator from 18,000 feet to ground level by 2,500 feet per minute.
• Terminate chamber flight.

The procedures for the profile in Figure A-3 are as follows:

• Begin 30-minute denitrogenation.
• Perform 5,000-foot ear and sinus check by 2,500 feet per minute.
• Ascend main accumulator from ground level to 8,000 feet by 2,500 feet per minute.
• Ascend main accumulator from 8,000 feet to 25,000 feet by 5,000 feet per minute.
• Begin five-minute hypoxia demonstration.
• Descend main accumulator from 25,000 feet to 18,000 feet by 5,000 feet per minute for night-vision demonstration.
• Descend main accumulator from 18,000 feet to ground level by 2,500 feet per minute.
• Terminate chamber flight.

The procedures for the profile in Figure A-4 are as follows:

• Begin 30-minute denitrogenation.
• Perform 5,000-foot ear and sinus check by 5,000 feet per minute.
• Ascend main accumulator, and lock to 18,000 feet by 5,000 feet per minute.
• Perform running break of main accumulator, and lock; maintain lock at 18,000 feet.
• Continue main accumulator ascent to 35,000 feet by 5,000 feet per minute.
• Ascend main accumulator to 30,000 feet for 90-second hypoxia demonstration.
• Descend main accumulator to 15,000 feet by 10,000 to 12,000 feet per minute, with lock joining descent at 18,000 feet.
• Descend main accumulator, and lock to 8,000 feet by 5,000 feet per minute.
• Ascend main accumulator to 25,000 feet by maximum rate of ascent.
• Begin five-minute hypoxia demonstration.
• Descend lock to ground level by 5,000 feet per minute.
• Descend main accumulator to 18,000 feet by 5,000 feet per minute for night-vision demonstration.
• Descend main accumulator from 18,000 feet to ground level by 2,500 feet per minute.
• Terminate chamber flight.

The procedures for the profile in Figure A-5 are as follows:

• Ascend main accumulator to 32,500 feet by maximum rate.
• Ascend lock to 8,000 feet by 2,500 feet per minute.
• Perform rapid decompression.
• Main accumulator and lock equalize at 22,500 feet.
• Descend main accumulator; lock to 18,000 feet by 5,000 feet per minute, then from 18,000 feet to ground level by 2,500 feet per minute.