Thank you for that RVDT! Just so you know that "lessons learned" are put to use here, I'm traveling today to inspect a changed airplane breathing oxygen installation for approval (by STC) of its changed design tomorrow. Though upon considering the great information, I am confident that the design is already compliant as I found it to be 13 years ago when I first approved it, I will conduct my inspection, testing and design review with added wisdom having read that report!
This report is one small example of how an event which occurred in a helicopter was not really dependent upon the aircraft type, so the wisdom and lessons learned are applicable to any aircraft oxygen installation.
Thanks for that!