Throughout aviation history, a condition known as hypoxia has posed a risk to aircraft pilots, crew members, and passengers flying at high altitudes. Hypoxia occurs when the human body is exposed to high altitudes without protection. Defined as an insufficient supply of oxygen to the body’s tissues, hypoxia affects the central nervous system and organs. Brain cells, which are extremely sensitive to oxygen deprivation, can begin to die within 5 minutes after the oxygen supply has been cut off. When hypoxia lasts for longer periods of time, it can cause coma, seizures, and even brain death. Aircraft passengers exposed to either a slow, progressive increase in cabin altitude, or a sudden exposure to high cabin altitude, may show symptoms of inattentiveness, poor judgment, memory loss, and a decrease in motor coordination. Pilots afflicted with hypoxia may not be able to acknowledge the situation or take corrective action, leading to aircraft accidents or crashes.
Jan Zysko, a NASA Applied Research and Development engineer, invented the monitor to give Space Shuttle and International Space Station crew members an additional, independent notification of any depressurization events. Two major incidents—the MIR/Progress collision in 1997 and the Payne Stewart aircraft accident in 1999—reinforced the need for such a device. Zysko, a private pilot himself, also illustrated his invention’s necessity in the private sector by citing a significant number of hypoxia- and cabin pressure-related incidents contained in accident databases maintained by the National Transportation Safety Board and Federal Aviation Administration (FAA).
As part of the NASA Technology Transfer Program, Kennedy awarded a patent license to Kelly Manufact-uring Company, of Grenola, Kansas, to commercialize the monitor. The company previewed the Personal Cabin Pressure Altitude Monitor and Warning System (PCM 1000) at the Experimental Aircraft Association’s AirVenture OshKosh 2002 air show after making some modifications and incorporating several new functions. The device was then introduced into the market at the Sun ’n Fun air show in April 2003.
According to Zysko, Kennedy’s innovation has several other potential commercial uses. Applications beyond the aviation and aerospace industries include scuba diving, skydiving, mountain climbing, meteorology, altitude chambers, and underwater habitats. In the meantime, aircraft pilots can enjoy the extra safety that the PCM 1000 puts right in the palms of their hands.