Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
On early FALCON airplanes featuring the EASy cockpit, a new oxygen controller has been installed. An internal review has determined that the passenger oxygen mask boxes do not fit this new controller. In OVERRIDE mode, that is to say, when the internal pressure reducer is by-passed, oxygen (O2) flow is nominal, while in NORMAL mode O2 flow is reduced by half compared to what it should be. Consequently, in NORMAL mode the minimum mass flow of supplemental O2 for each passenger, as required by Certification Specifications, is no longer met. This could lead to passenger incommodation due to insufficient body oxygenation.
The unsafe condition is incorrectly fitted passenger oxygen mask boxes for the new controllers, which could result in incapacitation of passengers due to insufficient oxygen in the event of rapid depressurization of the airplane when the controller is in NORMAL mode. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.