Catastrophic Decompression; Small Place Solo

"Morgans" wrote in message ...
"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


moped then?

care to show where i have been abusive in this thread ?? and as for
profanity in the wording "christ on a bike" ? oh grow up.

Morgans wrote:

Christ didn't ride no bike.

I thought that's how he wound up on a crutch?

George Patterson
Great discoveries are not announced with "Eureka!". What's usually said is
"Hummmmm... That's interesting...."

"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.


uh huh. i know it does. though if i posted an exact figure for a
specific aircraft type, then a whole flood of posts saying i am wrong
because "xx" type is pressurized to "yy"




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.

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

Sec. 25.1 Applicability.

(a) This part prescribes airworthiness standards for the issue of type
certificates, and changes to those certificates, for transport category
airplanes.
http://www.astech-engineering.com/sy...apart25d.html#
Pressurization

Sec. 25.841 Pressurized cabins.

"(a) Pressurized cabins and compartments to be occupied must be equipped to
provide a cabin pressure altitude of not more than 8,000 feet at the maximum
operating altitude of the airplane under normal operating conditions."

Transport category:

* All jets with 10 or more seats or greater than 12,500lb Maximum
Takeoff Weight.
* All propeller driven airplanes with greater than 19 seats or greater
than 19,000lb Maximum Takeoff Weight.


Obviously the rule would not normlly apply to Medivac operations.

HTH,

Paul Nixon

"khobar" wrote in message news:W_qKb.17919$7D3.14891@fed1read02...
running with scissors wrote in
message om...
"John Gilmer" wrote in message
...
"Bob Gardner" wrote in message
news:QODIb.85072$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)

Sec. 25.1 Applicability.

(a) This part prescribes airworthiness standards for the issue of type
certificates, and changes to those certificates, for transport category
airplanes.
http://www.astech-engineering.com/sy...apart25d.html#
Pressurization

Sec. 25.841 Pressurized cabins.

"(a) Pressurized cabins and compartments to be occupied must be equipped to
provide a cabin pressure altitude of not more than 8,000 feet at the maximum
operating altitude of the airplane under normal operating conditions."

Transport category:

* All jets with 10 or more seats or greater than 12,500lb Maximum
Takeoff Weight.
* All propeller driven airplanes with greater than 19 seats or greater
than 19,000lb Maximum Takeoff Weight.


Obviously the rule would not normlly apply to Medivac operations.

HTH,

Paul Nixon

medevac ops are not exempt. though under certain medical conditions
the cabin my not be pressurized or pressurized to a lower altitude.
nitrogen narcosis is one condition that springs to mind.

running with scissors wrote in
message om...
"khobar" wrote in message
news:W_qKb.17919$7D3.14891@fed1read02...
running with scissors wrote
in
message om...
"John Gilmer" wrote in message
...
"Bob Gardner" wrote in message
news:QODIb.85072$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)

Sec. 25.1 Applicability.

(a) This part prescribes airworthiness standards for the issue of type
certificates, and changes to those certificates, for transport category
airplanes.

http://www.astech-engineering.com/sy...apart25d.html#
Pressurization

Sec. 25.841 Pressurized cabins.

"(a) Pressurized cabins and compartments to be occupied must be equipped
to
provide a cabin pressure altitude of not more than 8,000 feet at the
maximum
operating altitude of the airplane under normal operating conditions."

Transport category:

* All jets with 10 or more seats or greater than 12,500lb Maximum
Takeoff Weight.
* All propeller driven airplanes with greater than 19 seats or
greater
than 19,000lb Maximum Takeoff Weight.


Obviously the rule would not normlly apply to Medivac operations.

HTH,

Paul Nixon

medevac ops are not exempt. though under certain medical conditions
the cabin my not be pressurized or pressurized to a lower altitude.
nitrogen narcosis is one condition that springs to mind.

I was thinking about medivac helicopters. Dunno why since medivac goes
beyond helicopter operations. Oh well...

Paul Nixon

"khobar" wrote in message news:QLDKb.17987$7D3.1116@fed1read02...
running with scissors wrote in
message om...
"khobar" wrote in message
news:W_qKb.17919$7D3.14891@fed1read02...
running with scissors wrote
in
message om...
"John Gilmer" wrote in message
...
"Bob Gardner" wrote in message
news:QODIb.85072$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)

Sec. 25.1 Applicability.

(a) This part prescribes airworthiness standards for the issue of type
certificates, and changes to those certificates, for transport category
airplanes.

http://www.astech-engineering.com/sy...apart25d.html#
Pressurization

Sec. 25.841 Pressurized cabins.

"(a) Pressurized cabins and compartments to be occupied must be equipped
to
provide a cabin pressure altitude of not more than 8,000 feet at the
maximum
operating altitude of the airplane under normal operating conditions."

Transport category:

* All jets with 10 or more seats or greater than 12,500lb Maximum
Takeoff Weight.
* All propeller driven airplanes with greater than 19 seats or
greater
than 19,000lb Maximum Takeoff Weight.


Obviously the rule would not normlly apply to Medivac operations.

HTH,

Paul Nixon

medevac ops are not exempt. though under certain medical conditions
the cabin my not be pressurized or pressurized to a lower altitude.
nitrogen narcosis is one condition that springs to mind.

I was thinking about medivac helicopters. Dunno why since medivac goes
beyond helicopter operations. Oh well...

Paul Nixon


pressurized heli ?

running with scissors wrote in
message om...
"khobar" wrote in message
news:QLDKb.17987$7D3.1116@fed1read02...
I was thinking about medivac helicopters. Dunno why since medivac goes
beyond helicopter operations. Oh well...

Paul Nixon


pressurized heli ?

Just a minor short in the headset. I had helicopters on my mind when posting
the applicability part.

Paul Nixon

"khobar" wrote in message news:aqIKb.18693$7D3.14245@fed1read02...
running with scissors wrote in
message om...
"khobar" wrote in message
news:QLDKb.17987$7D3.1116@fed1read02...
I was thinking about medivac helicopters. Dunno why since medivac goes
beyond helicopter operations. Oh well...

Paul Nixon


pressurized heli ?

Just a minor short in the headset. I had helicopters on my mind when posting
the applicability part.

Paul Nixon

lol