What having a sky marshal really means

"Jack Davis" wrote in message ...
On Wed, 07 Jan 2004 21:08:03 GMT, "Steven P. McNicoll"
wrote:

Is there a procedure for a mishap that leaves the cabin at a higher pressure
than the outside atmosphere?

Not really, considering that this is the normal operating
configuration!

I think he means once you're on the ground.

On Wed, 7 Jan 2004 17:48:01 -0500, "Ron Natalie"
wrote:

I think he means once you're on the ground.

I see. Well, the Boeings maintain a higher-than-ambient cabin pressure
on the ground anyway (I'm *sure* we'll go deeper into that some time
soon!) so I'm still not sure what he meant by the following:

"Is there a procedure for a mishap that leaves the cabin at a higher
pressure than the outside atmosphere"?

No matter. I appreciate your attempt at clearing things up for me.
I've taken a few years off from the news groups and I see things
haven't changed much since the last time I was here!

-J

Jack Davis
B-737


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"Jack Davis" wrote in message
...

I see. Well, the Boeings maintain a higher-than-ambient cabin pressure
on the ground anyway (I'm *sure* we'll go deeper into that some time
soon!) so I'm still not sure what he meant by the following:

"Is there a procedure for a mishap that leaves the cabin at a higher
pressure than the outside atmosphere"?


How do you exit in an emergency if the cabin is at a higher pressure than
the outside atmosphere?



No matter. I appreciate your attempt at clearing things up for me.
I've taken a few years off from the news groups and I see things
haven't changed much since the last time I was here!


If you had the same difficulty last time the problem may be you. Have you
considered that?

On Wed, 07 Jan 2004 23:39:54 GMT, "Steven P. McNicoll"
wrote:

How do you exit in an emergency if the cabin is at a higher pressure than
the outside atmosphere?

You mean to tell me I actually hit upon a question to which you don't
already know the answer?

Now you've shocked me...

-J
-J

Jack Davis
B-737


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"Jack Davis" wrote in message
...

You mean to tell me I actually hit upon a question to which you don't
already know the answer?


It was my question.



Now you've shocked me...


It appears I've stumped you as well.

On Thu, 08 Jan 2004 02:32:46 GMT, "Steven P. McNicoll"
wrote:

It appears I've stumped you as well.

Not quite. Here's a hint for you: When a Captain decides to evacuate
the jet the crew completes the Evacuation check list. At the
completion of that check list the engines and APU are shut down.

Got it figured out yet?

-J

Jack Davis
B-737


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"Jack Davis" wrote in message
...

Not quite. Here's a hint for you: When a Captain decides to evacuate
the jet the crew completes the Evacuation check list. At the
completion of that check list the engines and APU are shut down.

Got it figured out yet?


I've got you figured out.

On Wed, 07 Jan 2004 23:39:54 GMT, "Steven P. McNicoll"
wrote:

If you had the same difficulty last time the problem may be you. Have you
considered that?

Steve, the difficulty only arises when people who know absolutely
nothing about airline flying try to pass themselves off as experts.
Just like the media, they don't intend to let facts get in their way
and that gets my goat a bit.

Since this is a "piloting" news group I'll expand my signature for
those who haven't had the (dis)pleasure of reading my rambling
ruminations before and who may be wondering about my qualifications.
It's a bit self-serving and this will be the last time I do it.

-J

Jack Davis
Aircraft flown: Piper series, Cessna Cutlass, Citation, Beechcraft
King Air (90 and 200), F-27/FH-227, EMB-120, DC-9, B727,B737,B747.


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So, just how would the emergency exits get opened when the aircraft is on
the ground and needs to be evacuated, if the cabin pressure is significantly
higher than the outside pressure?

I'm guessing that the pressure differential at ground level isn't enough to
prevent the exits from opening, but that this differential is (logically)
much higher at altitude, and thus would prevent the exits from opening in
flight. But I could be wrong.

And yes, sadly the whole newsgroup thing is a never-ending disappointment.
The most humorous recent example came from the "gun loons" thread, where I
suspect that 5 or 6 people are STILL arguing about the difference between a
"box cutter" and a "carpet knife".

"Geoffrey Barnes" wrote in message
link.net...

I'm guessing that the pressure differential at ground level isn't enough
to
prevent the exits from opening, but that this differential is (logically)
much higher at altitude, and thus would prevent the exits from opening in
flight. But I could be wrong.


The pressure differential wouldn't have to be that great to create a
considerable force holding the exit in place. I don't know what the surface
area of an exit is, but a square twenty inches on a side has an area of 400
square inches. It would take 200 pounds of force to overcome a 1/2 psi
pressure differential.