Why nitrogen?

"Morgans" wrote in message
...

"Peter Dohm" wrote

It appears that they were lucky and the oxygen was'nt needed; but it does
remind me of some of the speculation surrunding the Paine Stewart case.
Two hypotheses around my local airport were that 1) the tank was
inadvertantly filled with nitrogen or 2) that someone misread the
labeling on the regulator on/off handle--which is counterintuitively
labeled with "on" or "off" and arrows pointing which direction to turn
the knob for the desired result. I don't recall whether the case was
ever fully resolved; but a lot of pilots found a couple of areas worthy
of their maximum vigilance!

Learjets don't use bottled oxygen; they have pressurized air from the
engines.

--
Jim in NC

Learjets do indeed use bottled oxygen and it is found in the nose bay area.
There is a thin capillary that runs into the cockpit to a pressure gauge.
The pressure gauge displays the pressure in the tank regardless of whether
the valve is turned on or off. The pressure in the tank can read full on
the ground but at low temperature at altitude will read several hundred
pounds less.

--

*H. Allen Smith*
WACO - We are all here, because we are not all there.

"Allen" wrote

Learjets do indeed use bottled oxygen and it is found in the nose bay
area. There is a thin capillary that runs into the cockpit to a pressure
gauge. The pressure gauge displays the pressure in the tank regardless of
whether the valve is turned on or off. The pressure in the tank can read
full on the ground but at low temperature at altitude will read several
hundred pounds less.

They do? For primary breathing air at altitude? Is there no cabin air
pressurization provided by bleed air from the engines?

I'm not doubting your word, just trying to understand. I thought all
bizjets used bleed air to pressurize the cabins.
--
Jim in NC

"Morgans" wrote in message
...

"Allen" wrote

Learjets do indeed use bottled oxygen and it is found in the nose bay
area. There is a thin capillary that runs into the cockpit to a pressure
gauge. The pressure gauge displays the pressure in the tank regardless of
whether the valve is turned on or off. The pressure in the tank can read
full on the ground but at low temperature at altitude will read several
hundred pounds less.

They do? For primary breathing air at altitude? Is there no cabin air
pressurization provided by bleed air from the engines?

I'm not doubting your word, just trying to understand. I thought all
bizjets used bleed air to pressurize the cabins.
--
Jim in NC



All the business jets I know of do use bleed air for cabin pressurization,
and have oxygen bottles for emergency when you have a cabin pressure
failure. You only need enough oxygen to get you down to 10k feet. It would
be nice to be conscious during this phase.

--
Regards, Bob F.

"Morgans" wrote in
:


"Allen" wrote

Learjets do indeed use bottled oxygen and it is found in the nose bay
area. There is a thin capillary that runs into the cockpit to a
pressure gauge. The pressure gauge displays the pressure in the tank
regardless of whether the valve is turned on or off. The pressure in
the tank can read full on the ground but at low temperature at
altitude will read several hundred pounds less.

They do? For primary breathing air at altitude? Is there no cabin
air pressurization provided by bleed air from the engines?

I'm not doubting your word, just trying to understand. I thought all
bizjets used bleed air to pressurize the cabins.



They do you idiot. Loss of pressurisation was being discussed.

Learn to read...


Bertie

"Bertie the Bunyip" wrote in message
...

Learn to read...


Bertie

Why you can't.

"Mick" @_#`~#@.^net wrote in :


"Bertie the Bunyip" wrote in message
...

Learn to read...


Bertie

Why you can't.



And you might learn to write.



Bertie

"Bertie the Bunyip" wrote in message
...
"Mick" @_#`~#@.^net wrote in :


"Bertie the Bunyip" wrote in message
...

Learn to read...


Bertie

Why you can't.



And you might learn to write.



Bertie

Why you can't.

"Mick" @_#`~#@.^net wrote in :


"Bertie the Bunyip" wrote in message
...
"Mick" @_#`~#@.^net wrote in :


"Bertie the Bunyip" wrote in message
...

Learn to read...


Bertie

Why you can't.



And you might learn to write.



Bertie

Why you can't.


Yeh. You really don't realise what you're saying here, do you, illiterate
boi?



Bertie

"Morgans" wrote in message
...

"Allen" wrote

Learjets do indeed use bottled oxygen and it is found in the nose bay
area. There is a thin capillary that runs into the cockpit to a pressure
gauge. The pressure gauge displays the pressure in the tank regardless of
whether the valve is turned on or off. The pressure in the tank can read
full on the ground but at low temperature at altitude will read several
hundred pounds less.

They do? For primary breathing air at altitude? Is there no cabin air
pressurization provided by bleed air from the engines?

I'm not doubting your word, just trying to understand. I thought all
bizjets used bleed air to pressurize the cabins.
--
Jim in NC


I am sorry Jim, the O2 is for emergency use. The cabin is pressurized from
engine bleed air. The O2 masks drop from the ceiling at 14K' cabin altitude
just like the airliners.

--

*H. Allen Smith*
WACO - We are all here, because we are not all there.

"Allen" wrote

I am sorry Jim, the O2 is for emergency use. The cabin is pressurized
from engine bleed air. The O2 masks drop from the ceiling at 14K' cabin
altitude just like the airliners.

Yep, that's what I thought.

Sorry you misunderstood me, and I misunderstood you.

This went back to the possibility of oxy causing the Payne Stewart crash,
when I replied it was not likely because that was believed to be a primary
pressurization problem.
--
Jim in NC