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Fresh Air Not Circulated Air In A/c Cabins  
User currently offlineAdvancedkid From United States of America, joined Jun 2000, 762 posts, RR: 2
Posted (15 years 10 months 6 days 7 hours ago) and read 1742 times:

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.

3 replies: All unread, jump to last
User currently offlineTropicalSkies From , joined Dec 1969, posts, RR:
Reply 1, posted (15 years 10 months 6 days 5 hours ago) and read 1718 times:

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

User currently offlineAAR90 From United States of America, joined Jan 2000, 3590 posts, RR: 44
Reply 2, posted (15 years 10 months 5 days 18 hours ago) and read 1687 times:

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!
User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 3, posted (15 years 10 months 5 days 16 hours ago) and read 1682 times:

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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