What is the maximum altitude a non-pressurized aircraft can fly when transporting a person suffering from DCS/AGE?

In the context of transporting a person suffering from Decompression Sickness (DCS) or Arterial Gas Embolism (AGE), the maximum altitude a non-pressurized aircraft should fly is 1,000 feet. This limit is essential because the reduction in atmospheric pressure that occurs at higher altitudes can exacerbate the symptoms of DCS or AGE.

When a diver ascends too quickly, nitrogen that has been absorbed into the body at depth comes out of solution, forming bubbles in the blood. These bubbles can cause pain and various neurological symptoms associated with DCS. Similarly, in AGE, expanding gas bubbles can block blood vessels, potentially leading to life-threatening situations.

At altitudes above 1,000 feet, the reduced pressure may lead to further expansion of these nitrogen bubbles in the bloodstream, worsening the diver's condition. Therefore, keeping the aircraft at or below 1,000 feet allows for a stable pressure environment, minimizing additional risks associated with altitude changes while providing transportation to appropriate medical facilities.

Choosing a higher altitude can significantly increase the risk for the patient, making it imperative for crews to maintain a lower flying altitude during transportation.