Posts: 740
Joined: Wed Jun 14, 2000 1:27 pm

Fresh Air Not Circulated Air In A/c Cabins

Tue Aug 01, 2000 11:57 pm

Hi there,
Does anyone know if and which airline/s keep fresh
air for their passengers "as for the flight deck crew'?
This is a topic most airlines won't like us to know.
Cabin crew know about it but can risk their job if
found talking about.

RE: Fresh Air Not Circulated Air In A/c Cabins

Wed Aug 02, 2000 1:21 am

Sorry, Advanced, but you'll never find that one out. But, fly on every airline for three hour flights and you'll be able to tell. If you start breathing very stale air or become slightly nauseated, you'll know how fresh the air is.
There is already a post on this subject- "Stagnant Air Causing Mass Illness?"
Look there to talk more aobut this.

Tropical Skies-
Fly to new horizons
Posts: 3140
Joined: Fri Jan 21, 2000 11:51 am

RE: Fresh Air Not Circulated Air In A/c Cabins

Wed Aug 02, 2000 1:05 pm

This is one of the most stupid myths begun by misinformed flight attendants that continues to this day. The EXACT SAME AIR is used for the ENTIRE cabin in an airliner. The only difference is that the cockpit has a slightly higher flow of air to keep a slightly higher pressure than the cabin. This is so that smoke in the cabin will not drift into the cockpit (I gotta see to fly the thing).

*NO CARRIER* -- A Naval Aviator's worst nightmare!
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

RE: Fresh Air Not Circulated Air In A/c Cabins

Wed Aug 02, 2000 2:25 pm

Another thing merits mention: Many think crews don't use air conditioning to save money -- Once you are pressurized and at altitude, it takes constant flow from the packs to maintain your 6-8 psi differential...even on the "tightest" of hulls. Shut off the packs...with the outflow valve fully closed...and your cabin altitude will climb like a raped ape. A good hull leakdown rate from 7 or so psi to ambient would be less than 10 minutes...a good tight one at that. Also, don't attribute warm inflight temperatures ( at cruise anyway ) to non use of air conditioning -- You would all die from hypothermia due to the extreme cold at 25-35K feet...I don't care if you're over Yuma Arizona in July, it's cold up there. Temperature can be set automatically ( at a desired cabin temp - 65-85F ) with the mix valves ( or trim valves ) modulating hot/cool air to maintain it or manually. In any case there is still air flowing into the A/C...and flowing out ( so as to automatically maintain and not exceed max differential pressure ) controlled by an outflow valve, which is automatically controlled itself. A bit more to it than that but you get the idea.

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