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Originally posted by weedwhacker
reply to post by smurfy
BTW fresh air is not available under pressurization.
Wrong!!! This is why I mentioned that you don't understand the technology, and the systems.
ALL the air that is used to pressurize the cabin comes from outside!! (Where else?)
It enters the engines first....undergoes some magic, and then is pumped into the airplane. I'm sure there are very detailed explanations on the Webz, I don't need to describe the entire process here.
Point is, there are NO "chem"-trail sprayers in use attached to regular large commercial airliners...and nothing other than outside air gets into the systems.
Now, on modern jets, as a fuel-saving plan, airliners ARE equipped with "re-circ" fans and ducting....this has caused more "controversy" in the media, urged on by ignorant reporters and members of the public, than it warrants.
Re-circulating the interior air isn't what it sounds like...the pressurization "packs" aren't shut-down in flight, they continue to pump air in...and, of course, there is either one or more outflow valves to regulate the internal pressure properly...in normal modes, this is entirely automatic, computer monitored and controlled. Unless it has a fault, then it alerts the crew, and there are back-up systems and methods and procedures.
The hot engine bleed air has to be "pre-cooled" through an air-to-air heat exchanger. This is a back-pressure thing....by re-using some of the interior air, already at correct temp, you can divert the hot bleed air overboard...valves modulate to do this, as part of the whole system mentioned above.
When you read on it, the difference for passengers is minor. The old Boeing 727 (about the same size cabin volume as the 757) completely replaced its air, when at altitude, about every five minutes. Ont he 757, it's about every 10 minutes. No big deal.
But note the words...."completely replaces". And, that comes from where? Yes, outside, of course.
Originally posted by schlub
Originally posted by ~Lucidity
Oh wow. So how far are they going to go to vilify this gentleman? Let me guess...he's had a psychotic break...he's old and feeble...he has a grudge. Anyway...here's the video...
added video....edit on 1/16/2011 by ~Lucidity because: (no reason given)
In all fairness, he does come across as a psychotic. The theory that there are death dumps to pointlessly and intentionally kill thousands of animals doesn't make sense. I'm not saying he's not right, just that I'd like to have a better idea of WHY they're doing it and what they hope to gain.
Originally posted by smurfy
reply to post by smurfy
The air is secondhand and you know it, you are just to quick to point out something in a false way. I never mentioned recirculated air either, that is your presumption. This is also why the air into the cabin can be contaminated. Now this is a link to the nasty stuff,
www.youtube.com...
National Jet Systems (NJS) of Australia has embarked on the latest in a long line of modifications to BAe 146 engines to reduce the risk of cabin fumes, a problem that has plagued the regional jet.
...... chemicals from oil and hydraulic fluids have leaked into the aircraft cabin air conditioning system as a result of engine oil seal failures.
Bleed air from the engines, an auxiliary power unit, or a ground source, which can be in excess of 150°C and at a pressure of perhaps 32psi, is directed into a primary heat exchanger. Outside air at ambient temperature and pressure is used as the coolant in this air-to-air heat exchanger. Once the hot air has been cooled, it is then compressed by the centrifugal compressor. This compression heats the air (the maximum air temperature at this point is about 250°C) and it is sent to the secondary heat exchanger, which again uses outside air as the coolant. The pre-cooling through the first heat exchanger increases the efficiency of the ACM because it lowers the temperature of the air entering the compressor, so that less work is required to compress a given air mass (the energy required to compress a gas by a given ratio rises as the temperature of the incoming gas rises).
At this point, the temperature of the compressed cooled air is somewhat greater than the ambient temperature of the outside air. The compressed, cooled air then travels through the expansion turbine which extracts work from the air as it expands, cooling it to below ambient temperature (down to -20°C or -30°C). It is possible for the ACM to produce air cooled to less than 0°C even when outside air temperature is high (as might be experienced with the aircraft stationary on the ground in a hot climate).
The work extracted by the expansion turbine is transmitted by a shaft to spin the pack's centrifugal compressor and an inlet fan which draws in the external air for the heat exchangers during ground running; ram air is used in flight. The power for the air conditioning pack is obtained by the reduction of the pressure of the incoming bleed air relative to that of the cooled air exiting the system (Boeing[3] describes a reduction from about 30psi to about 11psi). After the air has been cooled down, water vapor in the air condenses, forming fog or high humidity. To get rid of this, the air exiting the expansion turbine is passed through a water separator, which uses centrifugal force to throw the water particles into a coalescer bag that absorbs the moisture (this condensate can be injected into the outside air entering the secondary heat exchanger to improve its performance).
The air can now be combined in a mixing chamber with a small amount of uncooled engine bleed air. This warms the air to a desired temperature, and then the air is vented into the cabin or to electronic equipment.
You may also remember the 737 that crashed short of East Midlands airport.
It crashed because the pilot thought he had lost his starboard engine, and shut it down when in fact he was losing his left.
That's because he had smoke in the cockpit, and assumed that, because the aircon was situated on the starboard engine.
The Captain, Kevin Hunt, believed the right engine was malfunctioning due to the smell of smoke because in previous Boeing 737 variants bleed air for the air conditioning system was taken from the right engine.
I have had first hand experience of cabin fumes on a trip to Heathrow in a 727...
.... when I was stuck at the tail. The fuel fumes were terrible, and I was sick as a pig!
There is a discrepancy in what you have already said to me....
... either the older 737 had two bleeders or it did not, so if it did have two, and you know that, it would be new information to the enquiry.
It would not change the official outcome of pilot error of course. Sad that.
Originally posted by smurfy
reply to post by weedwhacker
What's this about chemtrail switches? it's not something I have discussed or ever inferred, keep the silly stuff to yourself. Regards the enquiry report they do differentiate between the older and newer model 'planes and concur it as a reason for the pilot error, and for no other purpose. It doesn't matter then if there were a hundred sources of incoming air, if those sources et al, had one final destination in the older 'plane, and hence the pilot error in the new 'plane.
Originally posted by MrAnnunaki
Originally posted by smurfy
reply to post by weedwhacker
What's this about chemtrail switches? it's not something I have discussed or ever inferred, keep the silly stuff to yourself. Regards the enquiry report they do differentiate between the older and newer model 'planes and concur it as a reason for the pilot error, and for no other purpose. It doesn't matter then if there were a hundred sources of incoming air, if those sources et al, had one final destination in the older 'plane, and hence the pilot error in the new 'plane.
he is talking about secret switches
yea
Originally posted by Stewie
reply to post by firepilot
Thanks for bringing that video to our attention, firpilot. It must mean a great deal to YOU. For you to hold it in such high esteem makes it credible., because you know SO much about this stuff.
Thanks again, firplot.
Originally posted by dplum517
Wow..... the that comes out of firepilot and weedwhackers mouths is ridiculously naive.
Get it through you tiny little brains that there are things way bigger than you. You two literally have no life. You sit on every Chemtrail thread ready to pounce on the next poster. Again... only confirming you're paid agents or very lonely men.
Let me say it again...... get it through your thick skulls that you will NEVER convince anyone that Chemtrails don't exist. You got that? You are LOSING the fight.