Linked Questions

1 vote
0 answers
1k views

How do the air conditioning packs work for the CRJ 700/900? [duplicate]

Please provide details on how the packs on the CRJ 700/900 work. How does the system use air from the packs to make cold air for the aircraft?
Gerry A Schmidt Sr's user avatar
0 votes
1 answer
999 views

What is the Hot Air Pressure Regulating valve and what's its purpose? [duplicate]

What does the hot air pressure regulating valve do, yes I know that it regulates hot air pressure but what does that do, create hot air? How does it regulate hot air pressure? I have a picture of ...
Gary Zenger's user avatar
31 votes
1 answer
10k views

Why is cabin pressure increased above ambient pressure on the ground?

As far as I know at least some (e.g. some Bombardier Dash-8 series) airplanes during takeoff may increase cabin pressure above air pressure on the ground, before starting to decrease it. In one case ...
DavisNT's user avatar
  • 411
15 votes
2 answers
12k views

What is this tube connected to a 757 for?

In this photo, there is a 757 at Narita Airport with a tube connected to the belly. Source: Airliners.net The tube is in the middle of the plane. There is a similar question about this tube, but ...
user13197's user avatar
  • 11.4k
10 votes
2 answers
4k views

How do bleedless passenger airliners keep cabin air breathable?

When you web-search an answer for how airliners maintain cabin air breathability, the typical answer you get is that bleed air is the key: new air comes in from the outside and gets mixed with old air....
einpoklum's user avatar
  • 546
15 votes
3 answers
26k views

How do big planes like 737 manage fresh air for passengers during flight?

How do the big planes (e.g. A380 or 737) flying on high altitudes manage to get fresh air for passengers and crew during the flight? I know the inner space of the plane used for passengers and crew ...
Juhele's user avatar
  • 275
12 votes
1 answer
14k views

What are these elements on the back of a Boeing 737?

I forgot the model of that plane but I believe it's a 737. I labeled each element for clarity. What are they? Click here for high-res.
Antzi's user avatar
  • 4,222
9 votes
2 answers
4k views

What are those in the belly of a 747?

In the next picture what are the items circled in red? Photographed by Adrian Pingstone in August 2002 and released to the public domain.
XF-91's user avatar
  • 2,096
6 votes
3 answers
3k views

Why doesn't condensation form on the inside of airliner windows?

If outside the aircraft is pretty cold and inside the cabin the air temperature is different, why don't the windows become fogged up on the inside?
user13197's user avatar
  • 11.4k
3 votes
2 answers
2k views

Why is the temperature of the cabin so low during a flight?

While I understand that at very high altitudes the ambient air temperature is extremely cold outside the aircraft (-56 F), it always bothers me that I find myself sneezing and genuinely uncomfortable ...
Kxy's user avatar
  • 844
2 votes
1 answer
3k views

Where does the final cooling take place in the air cycle machine of the air conditioning system?

On aircraft with an ACM air conditioning, where does the final cooling take place? Is it in the ACM expansion turbine or in the ACM compressor?
KM320's user avatar
  • 349
5 votes
1 answer
2k views

Who controls the cabin air temperature?

I understand the B737-800 has two air conditioning packs that handle the temperature of three zones: the cockpit, the fwd cabin and the aft cabin. I understand that which pack is turned on is ...
Paul Ogilvie's user avatar
2 votes
1 answer
3k views

What are the differences between these types of air cycle machines?

I am MSC student of mechanical engineering and my project is about ACM machine. I have read something about various systems of air conditioning system in aircrafts; simple system boot strap reduced ...
ghlam's user avatar
  • 43
2 votes
1 answer
785 views

What is the function of ECS in airplane? [closed]

What is the function of ECS in airplane?
Eng. Omar Eyad 's user avatar
3 votes
1 answer
699 views

If the cabin temperature controller does not function, does the pilot have to make an emergency landing?

The cabin temperature controller in commercial airlines, controls the cabin temperature. But if for any reason, it does not function, does the pilot have to make an emergency landing, or can he cruise ...
Firee's user avatar
  • 9,141

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