boeing777311
Posts: 123
Joined: Sun Apr 01, 2001 5:29 am

MAX Cruising Alititude

Tue Feb 25, 2003 8:33 am

What is the max cruising altitude of a plane with out a pressureizd cabin?

Also what are some aircrafts (civil and military) max altitudes?

thanks
 
timz
Posts: 6102
Joined: Fri Sep 17, 1999 7:43 am

RE: MAX Cruising Alititude

Tue Feb 25, 2003 9:42 am

If you mean, max altitude to carry paying passengers, must be 10000 ft? Or maybe less?

Or is that just a US rule? Maybe they waive it at La Paz anyway.
 
hmmmm...
Posts: 1959
Joined: Tue May 18, 1999 8:32 am

RE: MAX Cruising Alititude

Tue Feb 25, 2003 9:58 am

Canadian air regulations stipulate that, in Canada, no person shall fly an unpressurized aircraft between 10,000 and 13,000 ft. ASL for more than 30 minutes unless there is, available to each person, an oxygen mask and a supply of oxygen, nor shall anyone fly an unpressurized aircraft, for any amount of time over 13,000 ft., unless there is an oxygen mask and a supply of oxygen available for each person.

Those are the legal limits, but that also gives you a good idea of what the practical limits are.

An optimist robs himself of the joy of being pleasantly surprised
 
timz
Posts: 6102
Joined: Fri Sep 17, 1999 7:43 am

Okay, How About...

Tue Feb 25, 2003 10:35 am

Does anybody know an airline that uses oxygen masks routinely?
 
hmmmm...
Posts: 1959
Joined: Tue May 18, 1999 8:32 am

RE: MAX Cruising Alititude

Tue Feb 25, 2003 10:45 am

Read the question again. He asked about an unpressurized plane.
An optimist robs himself of the joy of being pleasantly surprised
 
catpac
Posts: 226
Joined: Sat Mar 10, 2001 6:24 pm

RE: MAX Cruising Alititude

Tue Feb 25, 2003 6:34 pm

A large jet (A340, B747) around 35,000ft-40,000
Smaller jets (B737, A320) prefer around 30,000ft-35,000ft
executive jets (Citation, Learjet) prefer above 40,000ft

Concorde loves altitudes of about 55,000ft

Blackbird often reaches up to 80,000ft and a speed of Mach 3.0

these altitudes are averages, but at the end of the day it depends oh how long the route is and the weight of the aircraft, etc...but this should give you a rough idea of who flies where.

Hope this helps
Mike
 
A350-200
Posts: 146
Joined: Thu Oct 12, 2000 5:39 pm

RE: MAX Cruising Alititude

Tue Feb 25, 2003 7:06 pm

This is about UNpressurized flights
 
MxCtrlr
Posts: 2312
Joined: Tue Nov 13, 2001 11:22 am

RE: MAX Cruising Alititude

Tue Feb 25, 2003 7:25 pm

According to the B-727 MEL (Minimum Equipment List, for those who don't know), an operate may operate a B-727 unpressurized but must limit altitude to 10,000 feet.

MxCtrlr  Smile/happy/getting dizzy
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Kay
Posts: 1797
Joined: Fri Mar 01, 2002 3:41 pm

RE: MAX Cruising Alititude

Tue Feb 25, 2003 11:04 pm

Scientifically, 12,500ft is the max altitude after which oxygen lacks. More than 30 minutes up there and one suffers hypoxia and other lack-of-oxygen related symptoms.
Very dangerous. You can become unconscious.
"Hmmmmm", 10,000ft is the legal limit in Canada, but not the practical limit! I spend quite some time around that altitude with a max of 10,500ft in the 172.

kay
 
CX Flyboy
Posts: 6030
Joined: Sun Dec 26, 1999 6:10 pm

RE: MAX Cruising Alititude

Tue Feb 25, 2003 11:47 pm

You can fly up to max. alt of the aircraft unpressurized, it's just that you need oxygen masks on. Being unpressurised does not limit max alt.
 
radarbeam
Posts: 998
Joined: Fri Mar 01, 2002 9:00 am

RE: MAX Cruising Alititude

Tue Feb 25, 2003 11:56 pm

The truth is that hypoxia can start at different levels depending on the person and other factors, such as the time of the day. For example during day time one could become hypoxic at 7,000ft or 8,000ft if the person is in bad physical condition or if the person is a smoker. And during night time assuming the person is in good health condition (non-smoker) hypoxia could start as low as 5,000ft.
 
galaxy5
Posts: 1952
Joined: Sat Mar 18, 2000 10:09 pm

RE: MAX Cruising Alititude

Wed Feb 26, 2003 12:49 am

in the US ( military to be specific ) the max alt without supplemental oxygen requirements is 10,000 feet.
"damn, I didnt know prince could Ball like that" - Charlie Murphy
 
Dufo
Posts: 796
Joined: Tue May 18, 1999 2:41 am

RE: MAX Cruising Alititude

Wed Feb 26, 2003 12:59 am

The highest I have been with a C172 was 13500ft (for about 5 minutes). Simple mental tests worked just fine even up there  Smile


Regards,
Jernej
I seriously think I just creamed my pants without any influence from any outside variables.
 
hmmmm...
Posts: 1959
Joined: Tue May 18, 1999 8:32 am

RE: MAX Cruising Alititude

Wed Feb 26, 2003 1:26 am


Hmmmmm", 10,000ft is the legal limit in Canada, but not the practical limit! I spend quite some time around that altitude with a max of 10,500ft in the 172.M

You are incorrect, the legal limit in Canada is not 10,000 ft. You did not bother to read my post. Nor have you bothered to read the Canadian Aviation Regulations before posting about this issue.

The legal limit is 13,000 ft. for 0 minutes without oxygen as described. Then it is anywhere between 10,000 to 13,000 ft. for a max of 30 minutes without oxygen as described. Reference CAR 605.31
An optimist robs himself of the joy of being pleasantly surprised

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