In recent posts about service ceilings, it seems pretty obvious that the SR22 is capable of much higher altitudes than 17,000 feet. However, if the SR22 was certified based on the SR20 type certificate and never tested at altitudes higher than the SR20, then presumably we have to live with this limitation until Cirrus decides to certify it for higher (write in campaign anyone?).
But that got me thinking about oxygen for my plane. In re-reading the POH, the only oxygen system certified is “Mountain High” mounted in front of the right seat facing forward, making the SR22 a 3-place plane at high altitude. Seems unfortunate given the many recommendations by COPA forum postings.
To play devil’s advocate, to use any other oxygen system mounted in any other way would be technically in violation of the SR22 type certificate. I presume the FAA could bust you during a ramp check. And if an accident occurs with an uncertified system in place, what would happen when our insurance companies hear about it?
So here is a suggestion: does anyone have experience getting an FAA “field approval” for a Cirrus modification? Seems like a pretty simple request that could be inspected very easily after you installed your portable O2 system yourself. And in reading the FAA website info on field approvals via Form 337, they can become the basis for sharing approvals, hopefully, via the COPA Forum.
With only a single oxygen system certified that reduces the SR22 passenger capabilities, it seems highly desirable to get better alternatives “approved” before the consequences of non-compliance outweigh the advantages.