Graeme Cant wrote:

I'm not sure about that. If we forget how it came into your possession,
the FAA reference in 2(Background) says:

C. Title 49 CFR parts 171 through 180, Hazardous
Materials Regulations (HMR), pertains to the retest
and inspection of cylinders in transportation in
commerce. However, cylinders used as components in
aircraft are not considered to be in transportation in
commerce when installed in an aircraft.

That seems to me to imply that carriage as a supplementary oxygen system
in an aircraft does not qualify as "transportation in commerce". Again,
DOT regs would be inapplicable.

I think "cylinders used as components in aircraft" refers to built-in
oxygen systems, not the portable, carry-on, systems used in gliders and
the smaller general aviation aircraft. I know it looks like our
cylinders are "components" because there is a mounting hole and strap
for the cylinders, but without an oxygen system certification as part of
the glider, that hole is just another baggage space.

--
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Eric Greenwell
Washington State
USA

www.motorglider.org