Action
Notice of proposed rulemaking (NPRM).
Summary
We propose to adopt a new airworthiness directive (AD) for certain Zodiac Aerotechnics (formerly Intertechnique Aircraft Systems) flightcrew oxygen mask regulators as installed on, but not limited to, various transport and small airplanes. This proposed AD was prompted by a report that improper maintenance on oxygen mask regulators was found. This proposed AD would require the identification and replacement of all potentially affected units. This proposed AD also would require installation of a placard and revision of the airplane flight manual to include an operational procedure for use in case of depressurization. We are proposing this AD to detect and correct affected oxygen mask regulators, which could lead to inadequate protection to the affected flightcrew against hypoxia. Hypoxia can start from a headache and drowsiness and lead eventually to unconsciousness with severe consequence in terms of airplane controllability.