Time between dive and airline flight

"Forest Aten" <forestaten@comcast.net> wrote in message news:<PWfNc.33591$8_6.7250@attbi_s04>...


> Cochran has incorporated a flight data recorder on all of his Gemini
> computers. I have hundreds of flights recorded now and not one flight in a
> commercial airliner has exceeded 5100 ft above sea level.
>
> Forest Aten

None of your commercial airline flights has exceeded 5100 feet?


Since you were referring to a Cochran computer, I assume the error was
Cochran's, as his computers have made plenty of errors.

Otherwise, you'd better go back to your travel agent business and tend
to your data there.

Most of the commercial airline flights I've flown exceeded 29,000 feet.
I fly over 100,000 miles every year since 1999.

-- Bob.

Reef Fish <Large_Nassau_Grouper@Yahoo.com> wrote:
>> Cochran has incorporated a flight data recorder on all of his Gemini
>> computers. I have hundreds of flights recorded now and not one flight in a
>> commercial airliner has exceeded 5100 ft above sea level.
>None of your commercial airline flights has exceeded 5100 feet?

>Most of the commercial airline flights I've flown exceeded 29,000 feet.
>I fly over 100,000 miles every year since 1999.

Even with that fat head of your's, Bob, you'd pass out and die at that
level of air pressure.

Oh, that's right, you stepped into a thread and took Forest's remarks
out of context again. What a surprise. (Or would you have us believe
that a man as BRILLIANT as you couldn't figure out that he didn't stick
his flight recorder out the window)

--
Jason O'Rourke www.jor.com

He was refering to "Cabin Altitude", not aircraft altitude.

"Reef Fish" <Large_Nassau_Grouper@Yahoo.com> wrote in message
news:8fb7380b.0407271408.2b91c8d8@posting.google.c om...
> "Forest Aten" <forestaten@comcast.net> wrote in message
news:<PWfNc.33591$8_6.7250@attbi_s04>...
>
>
> > Cochran has incorporated a flight data recorder on all of his Gemini
> > computers. I have hundreds of flights recorded now and not one flight in
a
> > commercial airliner has exceeded 5100 ft above sea level.
> >
> > Forest Aten
>
> None of your commercial airline flights has exceeded 5100 feet?
>
>
> Since you were referring to a Cochran computer, I assume the error was
> Cochran's, as his computers have made plenty of errors.
>
> Otherwise, you'd better go back to your travel agent business and tend
> to your data there.
>
> Most of the commercial airline flights I've flown exceeded 29,000 feet.
> I fly over 100,000 miles every year since 1999.
>
> -- Bob.

"HLAviation" <caphenning@RMyahoo.com> wrote in message news:<9CBNc.16329$iK.14154@newsread2.news.atl.eart hlink.net>...
> He was refering to "Cabin Altitude", not aircraft altitude.

That made more sense, but still surprising.
>
> "Reef Fish" <Large_Nassau_Grouper@Yahoo.com> wrote in message
> news:8fb7380b.0407271408.2b91c8d8@posting.google.c om...
> > "Forest Aten" <forestaten@comcast.net> wrote in message
> news:<PWfNc.33591$8_6.7250@attbi_s04>...
> >
> > None of your commercial airline flights has exceeded 5100 feet?

From a google-retrievable post:


QUOTE.

Okay. Enough speculation about what cabin pressure airlines might use
in normal operations. Time for some actual RESEARCH.

Armed with a cover story (I said I needed the information to settle
a bar bet), since I didn't feel like explaining about AFU to airline
employees, I made a bunch of phone calls to people who should know
about these things. After navigating untold voice mail menus and
listening to lots of music (including salsa, when LAN-Chile put me
on hold), here are the results.

Northwest Airlines -- spoke to an information operator. She asked me to
hold, then came back and told me, "We try to keep our cabin pressure
at the equivalent of 4 or 5 thousand feet."

Delta Airlines -- "Ooh, that's a good question. Let me see if I can
find out." She first told me the cabin pressure is the equivalent
of 8 thousand feet in their Boeing 767s, then said it seemed to
be the same for all their aircraft.

British Airways -- Was referred to their engineering department at Detroit
Metro Airport. They told me the pressure was normally about
9 psi, or the equivalent of 7 thousand feet, and that the pressure
is the same in the passenger cabin and the cargo hold. "Got
to keep it like that, because we fly livestock a lot."

For good measure, I decided to try calling the Boeing Aircraft Company in
Everett, WA. Spoke to a woman in their public affairs office, who said
all their managers were out to lunch. She transferred me to an engineering
manager, who didn't know offhand. He said he'd find out and call me back.
He wanted to know my name, and why I wanted the information. He hasn't
called me back yet, so maybe he didn't buy my bar bet story.

So, Delta says 8,000, British Airways says 7,000 (or 9 psi), and Northwest
says they "try" to keep it around 4 or 5,000 feet.

END QUOTE.

Another poster wrote,

> On 2 recent flights on Delta along the Boston-Ft. Lauderdale route
> (different directions), my trusty pocket altimeter showed cabin
> pressures after level off of about 8000' and 6400' respectively.


I have always taken the 8000 figure as industry standard for cabin pressure
and since nearly all of my flights are on Boeing crafts, my experience
jives with what the Delta rep said, about Delta and Boeing.

In the excerpted post from the article titled,
"The absolute final word on airline cabin pressure", I snipped those
airlines for which the employees and "information operators" didn't
know beans about the cabin pressure of their airlines.


One FACT stood out in the excerpted story is that nobody gives a doodoo
about the actual cabin pressure. Cochran did, still feeding off the
technology he stole from Uncle Sam in ancient days, except Cochran is
known to be pretty error prone in HIS adaptation of technology.

So, perhaps Aten's figure was Cochran's fault after all. The
other inescapable conclusion is that Forest doesn't fly an Boeing
crafts, an incredible factoid for anyone who flies anywhere much.

-- Bob.

In article <8fb7380b.0407280754.2d775aa2@posting.google.com >,
Large_Nassau_Grouper@Yahoo.com (Reef Fish) writes:

>Okay. Enough speculation about what cabin pressure airlines might use
>in normal operations. Time for some actual RESEARCH.
...
>So, Delta says 8,000, British Airways says 7,000 (or 9 psi), and Northwest
>says they "try" to keep it around 4 or 5,000 feet.

Frankly, I doubt that 4-5000 alegedly claimed by Northwesr,
In any case, this is consistent with the "conventional wisdom" that the
pressure altitude in commercial airlines' cabins does not exceed 8000'.

--
Charlie Hammond -- Hewlett-Packard Company -- Ft Lauderdale FL USA
(hammond@not@peek.ssr.hp.com -- remove "@not" when replying)
All opinions expressed are my own and not necessarily my employer's.

"Reef Fish" <Large_Nassau_Grouper@Yahoo.com> wrote in message
news:8fb7380b.0407280754.2d775aa2@posting.google.c om...
> "HLAviation" <caphenning@RMyahoo.com> wrote in message
news:<9CBNc.16329$iK.14154@newsread2.news.atl.eart hlink.net>...
> > He was refering to "Cabin Altitude", not aircraft altitude.
>
> That made more sense, but still surprising.
> >
> > "Reef Fish" <Large_Nassau_Grouper@Yahoo.com> wrote in message
> > news:8fb7380b.0407271408.2b91c8d8@posting.google.c om...
> > > "Forest Aten" <forestaten@comcast.net> wrote in message
> > news:<PWfNc.33591$8_6.7250@attbi_s04>...
> > >
> > > None of your commercial airline flights has exceeded 5100 feet?
>
> From a google-retrievable post:
>
>
> QUOTE.
>
> Okay. Enough speculation about what cabin pressure airlines might use
> in normal operations. Time for some actual RESEARCH.
>
> Armed with a cover story (I said I needed the information to settle
> a bar bet), since I didn't feel like explaining about AFU to airline
> employees, I made a bunch of phone calls to people who should know
> about these things. After navigating untold voice mail menus and
> listening to lots of music (including salsa, when LAN-Chile put me
> on hold), here are the results.
>

It varies with every aircraft type and the altitude it is flying at. There
is a maximum pressure differential you can achieve. Pressurization is
created by P3 (or similar compressor stage) bleed air from the engine
spinning a turbine style compressor feeding into the cabin and generally
dumping through relief valves in the aft bulkhead. Since this bleed air
comes off at the compressor end of the engine, it restricts the power
available to the engine, which in turn restricts the altitude the aircraft
can achieve.
If you want to know what the available pressure differential is on an
aircraft, just talk to a Captain on that type, he's type rated and that
information is required learning for a type rating.

"Charlie Hammond" <hammond@not@peek.ssr.hp.com> wrote in message
news:ERSNc.6751$0O3.1406@news.cpqcorp.net...
> In article <8fb7380b.0407280754.2d775aa2@posting.google.com >,
> Large_Nassau_Grouper@Yahoo.com (Reef Fish) writes:
>
> >Okay. Enough speculation about what cabin pressure airlines might use
> >in normal operations. Time for some actual RESEARCH.
> ..
> >So, Delta says 8,000, British Airways says 7,000 (or 9 psi), and
Northwest
> >says they "try" to keep it around 4 or 5,000 feet.
>
> Frankly, I doubt that 4-5000 alegedly claimed by Northwesr,
> In any case, this is consistent with the "conventional wisdom" that the
> pressure altitude in commercial airlines' cabins does not exceed 8000'.

Now lets finish the reality of the statement: "When the aircraft is
operating at its maximum certified altitude "

Planes don't usually fly at these altitudes.

"HLAviation" <caphenning@RMyahoo.com> wrote in message news:<CpYNc.17445$iK.15340@newsread2.news.atl.eart hlink.net>...
> "Reef Fish" <Large_Nassau_Grouper@Yahoo.com> wrote in message
> news:8fb7380b.0407280754.2d775aa2@posting.google.c om...
> > "HLAviation" <caphenning@RMyahoo.com> wrote in message
> news:<9CBNc.16329$iK.14154@newsread2.news.atl.eart hlink.net>...
> > > He was refering to "Cabin Altitude", not aircraft altitude.
> >
> > That made more sense, but still surprising.

> > > > None of your commercial airline flights has exceeded 5100 feet?


> > QUOTE.
> >
> > Okay. Enough speculation about what cabin pressure airlines might use
> > in normal operations. Time for some actual RESEARCH.
> >
> > Armed with a cover story (I said I needed the information to settle
> > a bar bet), since I didn't feel like explaining about AFU to airline
> > employees, I made a bunch of phone calls to people who should know
> > about these things. After navigating untold voice mail menus and
> > listening to lots of music (including salsa, when LAN-Chile put me
> > on hold), here are the results.

WHY did you snip the results??

>
> It varies with every aircraft type and the altitude it is flying at. There
> is a maximum pressure differential you can achieve. Pressurization is
> created by P3 (or similar compressor stage) bleed air from the engine
> spinning a turbine style compressor feeding into the cabin and generally
> dumping through relief valves in the aft bulkhead. Since this bleed air
> comes off at the compressor end of the engine, it restricts the power
> available to the engine, which in turn restricts the altitude the aircraft
> can achieve.
> If you want to know what the available pressure differential is on an
> aircraft, just talk to a Captain on that type, he's type rated and that
> information is required learning for a type rating.

What kind of mumbo and double-talk is this? I DON'T give a rats ass
about the available pressure differential or any of the other crap you
brought out while snipping the RELEVANT info I provided:

QUOTE.

here are the results.

Northwest Airlines -- spoke to an information operator. She asked me to
hold, then came back and told me, "We try to keep our cabin pressure
at the equivalent of 4 or 5 thousand feet."

Delta Airlines -- "Ooh, that's a good question. Let me see if I can
find out." She first told me the cabin pressure is the equivalent
of 8 thousand feet in their Boeing 767s, then said it seemed to
be the same for all their aircraft.

British Airways -- Was referred to their engineering department at Detroit
Metro Airport. They told me the pressure was normally about
9 psi, or the equivalent of 7 thousand feet, and that the pressure
is the same in the passenger cabin and the cargo hold. "Got
to keep it like that, because we fly livestock a lot."

END QUOTE.

Call the airlines and nay Captain of those airlines yourself.

-- Bob.

In article <LsYNc.17449$iK.5210@newsread2.news.atl.earthlink. net>, "HLAviation" <caphenning@RMyahoo.com> writes:
>
>"Charlie Hammond" <hammond@not@peek.ssr.hp.com> wrote in message
>news:ERSNc.6751$0O3.1406@news.cpqcorp.net...
...
>> In any case, this is consistent with the "conventional wisdom" that the
>> pressure altitude in commercial airlines' cabins does not exceed 8000'.
>
>Now lets finish the reality of the statement: "When the aircraft is
>operating at its maximum certified altitude "

Nope. "Does not exceed" applies at lower than maximum atltitude too.

(But I do recognize that the maximum experienced cabin altititude
is almost always lower at lower flying altitudes.)

--
Charlie Hammond -- Hewlett-Packard Company -- Ft Lauderdale FL USA
(hammond@not@peek.ssr.hp.com -- remove "@not" when replying)
All opinions expressed are my own and not necessarily my employer's.

If the aircraft is flying lower than it's max altitude where it will achieve
8000' cabin altitude, the cabin altitude will correspondingly decrease in
altitude. When you're flying at FL 220, your cabin altitude will be lower
than when flying at FL 320.

"Charlie Hammond" <hammond@not@peek.ssr.hp.com> wrote in message
news:fO6Oc.6781$Ik4.4090@news.cpqcorp.net...
> In article <LsYNc.17449$iK.5210@newsread2.news.atl.earthlink. net>,
"HLAviation" <caphenning@RMyahoo.com> writes:
> >
> >"Charlie Hammond" <hammond@not@peek.ssr.hp.com> wrote in message
> >news:ERSNc.6751$0O3.1406@news.cpqcorp.net...
> ..
> >> In any case, this is consistent with the "conventional wisdom" that the
> >> pressure altitude in commercial airlines' cabins does not exceed 8000'.
> >
> >Now lets finish the reality of the statement: "When the aircraft is
> >operating at its maximum certified altitude "
>
> Nope. "Does not exceed" applies at lower than maximum atltitude too.
>
> (But I do recognize that the maximum experienced cabin altititude
> is almost always lower at lower flying altitudes.)
>
> --
> Charlie Hammond -- Hewlett-Packard Company -- Ft Lauderdale FL USA
> (hammond@not@peek.ssr.hp.com -- remove "@not" when replying)
> All opinions expressed are my own and not necessarily my employer's.
>