Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to any aircraft equipped with Puritan-Bennett Aero Systems Company (Puritan-Bennett) C351-2000 series passenger oxygen masks and portable oxygen masks. The proposed AD would require inspecting the passenger and portable oxygen masks for tears around the face cushion adjacent to the inner mask housing, and replacing or repairing any torn passenger or portable oxygen mask. Reports received from three airplane manufacturers of defective oxygen masks prompted the proposed action. The actions specified by the proposed AD are intended to prevent reduced oxygen consumption when passengers are required to use defective oxygen masks, which could result in passenger injury.