RR wrote on 10/1/2019 12:44 PM:
On Tuesday, October 1, 2019 at 6:45:06 AM UTC-4, John McLaughlin wrote:
Does everyone stick to the 18k limit for the cannula and 25k for the mask,

or are these limits considered advisory only?

The legalitys are not so clear, but practically it is about remembering to breathe only with your nose with the cannula. Something I felt i could do, and so far have remembered. It is much easier to hydrate and communicate with the cannula. Just don't forget...

The Mountain high EDS units will alarm if you don't breathe frequently enough, so
that might be sufficient to remind pilots to breather through their nose.
Continuous use of an oximeter that alarms with a low SPO2% may be a useful
additional reminder to breathe properly, and I think I would use one even if I was
using a mask.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1