Eros Oxygen Mask Question
02-16-2018, 03:22 PM
#11
Disinterested Third Party
Joined APC: Jun 2012
Posts: 6,001
Originally Posted by Hoof Hearted
If the eros quick don masks are certified to 41,000', what good would it do if you flew above FL410. For instance, The Eros mask is certified to 41,000', many aircraft have these installed and fly above FL410, such as B757, Gulfstreams, Westwinds, Astra's etc. If you were cruising at say FL450, would you be playing Russian roulette or am I missing something.Any help would be appreciated...
The aircraft type certification may be to FL450, but if the masks onboard that specific aircraft are limited to FL410, then the aircraft is limited to 410; the limitation is no longer a type certification one, but an equipment limitation.
A mask certified to 41,000' cabin pressure altitude is certified to FL410; in the event of a depressurization, the cabin pressure altitude IS 41,000. Think about it.
If the mask isn't designed and certified or flight above 41,000, then it doesn't matter what the aircraft is certified for; it's limited by the masks.
Not all masks are certified to FL410. Check what's in your aircraft. I've flown quite a few aircraft certified higher, which had inadequate masks and could not go to the aircraft type certificated altitude due to mask limitations.
02-16-2018, 04:52 PM
#12
Gets Weekends Off
Joined APC: May 2010
Position: Baja Vermont
Posts: 5,171
A RD at F450 does NOT put the cabin instantly at F450. The Dixie cups in the back would never sustain life above F250 for long. No mask in civil types are cert’d to PRESSURE altitudes above F410, for that you need pressure demand masks. The standard is based on the plane going down fast enough the cabin never comes close to F410.
GF
GF
02-16-2018, 05:42 PM
#14
Gets Weekends Off
Joined APC: May 2010
Position: Baja Vermont
Posts: 5,171
The Part 25 standard is occupants after a failure or combination of failures shall not be exposed to pressure altitudes above 25,000’ for more than 2 minutes and at no time exceed 40,000’. It must be shown by the manufacturer that exceeding these pressure altitudes is extremely improbable (1x 10E-9). In other words, no more likely than massive structural failure.
AC 25-20
GF
AC 25-20
GF
02-16-2018, 07:16 PM
#15
Gets Weekends Off
Joined APC: Jan 2013
Posts: 834
Hoof,
If you aren't already aware, and since you seem to have an interest in this subject, you might also research Harry Armstrong, and "Armstrong's Line." He basically wrote the book concerning pressure and breathing issues relating to pilots. His work also explains why O2 masks alone are pretty inefficient above FL400.
If you aren't already aware, and since you seem to have an interest in this subject, you might also research Harry Armstrong, and "Armstrong's Line." He basically wrote the book concerning pressure and breathing issues relating to pilots. His work also explains why O2 masks alone are pretty inefficient above FL400.
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