Part one of the rule requires aircraft carriers with more then 19 seats to permit persons with a disability to use an FAA approved respiratory assistive device. This pertains to personal oxygen concentrators, ventilators, respirators and continuous positive airway pressure devices. (CPAP).
Part two of DOT Rule 382.133 allows approved respiratory assistive devices on carriers if they have met FAA guidelines regarding electronic emissions. Companies need to affix a label to their device stating that the device has been tested and does not exceed the maximum level of radiated radio frequency interference. The FAA realizes that many CPAP carriers have not had time to test their devices and therefore do not conform to the rule and do not have a label. In this case the carrier will have to test the device prior to the flight to insure the device will meet radio frequency emission standards.
Part three of DOT 382.133 dictates that travelers wishing to fly contact their airline 48 hours in advance with intentions to fly with a respiratory assistive device. At the time of notification, supply the airline with the name of the manufacturer of the device, device specifications, and contact information of the manufacturer. This notification allows the airline to look up your device on a website to determine if it has been tested. If the airline determines that it has not, this gives you ample time to have the airline test the device.