Catastrophic Decompression; Small Place Solo

"John Gilmer" wrote in message ...
"Bob Gardner" wrote in message
news:QODIb.85072$VB2.187788@attbi_s51...
No way. You start off at sea level, of course, and they pump the chamber
pressure down to 25000 feet with masks on...then they do some experiments
with a few of the pilots taking their masks off, just to show how severely
their abilities are affected. Then comes the explosive decompression,
which
takes the chamber from 25K back down to sea level in a second or two.

SIlly question but ...

Why would "they" pressurize the aircraft to sea level? Why not some
compromise "pressure" like that equivalent to, say, 6,000 or 8,000 feet?


EMWTK

"they" dont. cabin pressurization is normally at 8000ft though crew
may elect to use different cabin pressures under certain circumstances
(eg medevac operations where pressurization is a factor)

"running with scissors" wrote in
message om...

"they" dont. cabin pressurization is normally at 8000ft though crew
may elect to use different cabin pressures under certain circumstances

Actually, it depends on the aircraft. Aircraft are certified to certain
"differential pressures" which is the difference between in the inside cabin
pressure and the outside ambient air pressure. An airframe must be designed
to handle the differential pressure required to maintain acceptable cabin
altitude up to the max flight level the aircraft is certified to.

As an example, the King Air I fly has a normal differential pressure of 6.6
psid. This provides for a cabin altitude of 2,700 up to 20,000 cruise
altitude, an 8,700 foot cabin altitude at 31,000 cruise altitude, and a
10,200 foot cabin altitude at 35,000 cruise altitude.

In contrast, the Lear 60 I fly has a normal psid of 9.5 (9.7 max) which
typically results in a cabin altitudes of around aprox 6,500 up in the
40,000 ish cruise altitudes.

"Gary Mishler" wrote in message news:eBoKb.745162$HS4.5776347@attbi_s01...
"running with scissors" wrote in
message om...

"they" dont. cabin pressurization is normally at 8000ft though crew
may elect to use different cabin pressures under certain circumstances

Actually, it depends on the aircraft. Aircraft are certified to certain
"differential pressures" which is the difference between in the inside cabin
pressure and the outside ambient air pressure.

We were talking about transport aircraft. US certificated transport aircraft
must keep the cabin altitude below 8000'.

"Ron Natalie" wrote in message
m...

"Gary Mishler" wrote in message
news:eBoKb.745162$HS4.5776347@attbi_s01...
"running with scissors" wrote
in
message om...

"they" dont. cabin pressurization is normally at 8000ft though crew
may elect to use different cabin pressures under certain circumstances

Actually, it depends on the aircraft. Aircraft are certified to certain
"differential pressures" which is the difference between in the inside
cabin
pressure and the outside ambient air pressure.

We were talking about transport aircraft. US certificated transport
aircraft
must keep the cabin altitude below 8000'.

Yup, I know. The Lear 60 is a transport category aircraft, certified under
Part 25, and it's cabin is normally around +/- 6,500ft. Previous poster
said cabin pressure is normally *at* 8,000 and I was just pointing out that
it depends on the aircraft.

Manufactures of transport category corporate jets seem to take pride in
pointing out to potential customers that their jet can maintain a lower
cabin altitude at cruise than the competitors, which all depends on the
certificated max psid.

"Gary Mishler" wrote in message news:N3yKb.764106$Fm2.730963@attbi_s04...
"Ron Natalie" wrote in message
m...

"Gary Mishler" wrote in message
news:eBoKb.745162$HS4.5776347@attbi_s01...
"running with scissors" wrote
in
message om...

"they" dont. cabin pressurization is normally at 8000ft though crew
may elect to use different cabin pressures under certain circumstances

Actually, it depends on the aircraft. Aircraft are certified to certain
"differential pressures" which is the difference between in the inside
cabin
pressure and the outside ambient air pressure.

We were talking about transport aircraft. US certificated transport
aircraft
must keep the cabin altitude below 8000'.

Yup, I know. The Lear 60 is a transport category aircraft, certified under
Part 25, and it's cabin is normally around +/- 6,500ft. Previous poster
said cabin pressure is normally *at* 8,000 and I was just pointing out that
it depends on the aircraft.

Manufactures of transport category corporate jets seem to take pride in
pointing out to potential customers that their jet can maintain a lower
cabin altitude at cruise than the competitors, which all depends on the
certificated max psid.


christ on a bike. i knew this would happen.

i stated "normally at 8,000ft", of course there are variations in
type, SOP and so on. i really didnt want to spend hours typing out a
list types and representative pressurization variations or a list of
SOP's for various operators of various types as either way it is going
to depend on what is set on the selector. say 8,000ft and someone will
say "we fly at 7,500".

the answer is in the FAR's.

"running with scissors" wrote in
message m...

"they" dont. cabin pressurization is normally at 8000ft ...

I noted:
Actually, it depends on the aircraft...

Explanation of pressurization certification, that some may find
informative, snipped.

An anonomyus person calling himself "running with scissors" replied with:

christ on a bike. i knew this would happen.

i stated "normally at 8,000ft", of course there are variations in
type, SOP and so on. i really didnt want to spend hours typing out a
list types and representative pressurization variations or a list of
SOP's for various operators of various types as either way it is going
to depend on what is set on the selector. say 8,000ft and someone will
say "we fly at 7,500".

the answer is in the FAR's.


Whoa big fella, cool your jets there.

the answer is in the FAR's.

Indeed it is. If someone offering further information for the benefit of
others in the NG was going to get your gander up so high, you could have
said something like "FAR's state that transport category aircraft must
maintain a cabin altitude below 8,000 ft."

christ on a bike

Indeed. Steve Martin; "Well Excuuuuuuse ME!"

Truce already.

"Gary Mishler" wrote in message news:6VEKb.750520$HS4.5879879@attbi_s01...
"running with scissors" wrote in
message m...

"they" dont. cabin pressurization is normally at 8000ft ...

I noted:
Actually, it depends on the aircraft...

Explanation of pressurization certification, that some may find
informative, snipped.

An anonomyus person calling himself "running with scissors" replied with:

christ on a bike. i knew this would happen.

i stated "normally at 8,000ft", of course there are variations in
type, SOP and so on. i really didnt want to spend hours typing out a
list types and representative pressurization variations or a list of
SOP's for various operators of various types as either way it is going
to depend on what is set on the selector. say 8,000ft and someone will
say "we fly at 7,500".

the answer is in the FAR's.


Whoa big fella, cool your jets there.

the answer is in the FAR's.

Indeed it is. If someone offering further information for the benefit of
others in the NG was going to get your gander up so high, you could have
said something like "FAR's state that transport category aircraft must
maintain a cabin altitude below 8,000 ft."

christ on a bike

Indeed. Steve Martin; "Well Excuuuuuuse ME!"

Truce already.

big fella ? oh you flatter me !

uh huh, ron natalie did state that in an earlier post. no probs on the
truce, pulse and blood pressure still in the green arc.

"Gary Mishler" wrote in message news:6VEKb.750520$HS4.5879879@attbi_s01...
"running with scissors" wrote in
message m...

"they" dont. cabin pressurization is normally at 8000ft ...

I noted:
Actually, it depends on the aircraft...

Explanation of pressurization certification, that some may find
informative, snipped.

An anonomyus person calling himself "running with scissors" replied with:

christ on a bike. i knew this would happen.

i stated "normally at 8,000ft", of course there are variations in
type, SOP and so on. i really didnt want to spend hours typing out a
list types and representative pressurization variations or a list of
SOP's for various operators of various types as either way it is going
to depend on what is set on the selector. say 8,000ft and someone will
say "we fly at 7,500".

the answer is in the FAR's.


Whoa big fella, cool your jets there.

the answer is in the FAR's.

Indeed it is. If someone offering further information for the benefit of
others in the NG was going to get your gander up so high, you could have
said something like "FAR's state that transport category aircraft must
maintain a cabin altitude below 8,000 ft."

christ on a bike

Indeed. Steve Martin; "Well Excuuuuuuse ME!"

Truce already.

unless of course the aircraf tin operation is not on the US reg, then
the answer wont be in the FAR's *G*

"running with scissors" wrote

christ on a bike. i knew this would happen.

Christ didn't ride no bike. I've had enough of you. You are abusive, and
now profane. I'll not hang around for strike three.

Plonk
--
Jim in NC

Morgans wrote:

"running with scissors" wrote

christ on a bike. i knew this would happen.


Christ didn't ride no bike. I've had enough of you. You are abusive, and
now profane. I'll not hang around for strike three.

Plonk

Oh dear. That had to hurt something awful...