| Re: difference between 29000 & 39000 |
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Group: aus.aviation · Group Profile
Author: PitsPits Date: Jul 27, 2008 00:44
On Jul 27, 3:21Â pm, BernieFlyer gmail.com> wrote:> RMK wrote:
>
>>> one for the boffins and arm chair boffins on  here
>
>>> Would  the damage potential  have been  greater/ the same/or less  to
>>> an aircraft in similar circumstances at a higher altitude ? To the
>>> recent QF incident
>
>>> for discussion
>
>> The aircraft is pressurized to it's maximum pressure differential as it
>> climbs (approx 8.9psi).
>
>> So it's the same regardless of whether you are at 29000'or 45000'.
>
>> The only 'danger' is that the higher you are, the longer it takes to get
>> down to
>> a safe level if you lose cabin pressure.
>
> I hear what you say but if its unsafe to be above 10,000 without
> additional oxygen then surely to keep the cabin sufficiently liveable
> you would not want to have unsafe levels (ie 10,000ft) above that
> height. Surely this means that the cabin must be under constantly
> increasing pressure as you climb? Maybe I need to go to school again.
>
> You started something here Phil!!
Gday Bernie
well AA is good for renewing knolwdge base for us old fellahs eh .
Do a some reading up think cabin pressure and max diff (hence my
reference to cross flow valves ) Also OUTflow valves ( dont mix em
up dinkum) as the tube climbes it should actually leak via the
valves and maintain cabin altitude what ever it is set at the area
oens I have seen look like a sort of vsi
Grab a paper or plastic bag and keep blowing you will get what I am
trying to say.
Other folks on here are better able to explain and also (unlike me)
currently qualified to do so .
next red herring (but related in a fashion) Why does ones ears pop
when altering (pressure dare we say altitude ) ? :-)
There is a great docu from the old pathe library that the RAAF used
to use as part of its instruction had comets brabazons tudors and
Britania viscount BAC 111 tests I think a copy is in Hobart
Achives
and certainly at ARDU if you are really keen .
Apart from a really easily understood flick just beautiful
footage
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