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71 votes
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What is this white smoke like thing, seen inside the cabin before takeoff?

Direct answer Air conditioning causes a large drop in cabin temperature, air humidity present in the air condensates into water droplets. It is similar to mist, fog and clouds. If water droplets enter ...
mins's user avatar
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50 votes
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Who controls mood lighting on a commercial airplane?

The cabin lighting is controlled by the cabin crew. There are usually control panels at multiple locations throughout the cabin, typically near an entrance door, where the cabin crew is seated. On the ...
Bianfable's user avatar
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30 votes

What is the viability of stacking passengers in an airplane cabin?

I see several challenges with this design, both technological and not: Making that design safe enough will be difficult, the structure you add in the cabin would need to be strong enough to maintain ...
GdD's user avatar
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27 votes

Do airliner cabin filters trap viruses or other pathogens?

Modern airliners use HEPA filters to filter the air before re-circulation. This will remove almost all airborne pathogens like viruses: The overall risk of contracting a disease from an ill person ...
Bianfable's user avatar
  • 55.5k
26 votes

Do airliner cabin filters trap viruses or other pathogens?

IF the airliner has HEPA filtration yes, so pathogens floating in the air that happen to get drawn into the recric system would be trapped and not recirculated, so some of the total pathogen load in ...
John K's user avatar
  • 130k
25 votes

What is the viability of stacking passengers in an airplane cabin?

The problems I can see with that design: Increased structural weight: all things remaining the same, you will have less payload availability for luggage/cargo. Cabin servicing you either add an ...
Federico's user avatar
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25 votes
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How do bleedless passenger airliners keep cabin air breathable?

Bleedless aircraft still get air from outside. They just have dedicated compressors to compress outside air for cabin use, rather than relying on bleed air from the engines. The air compressors have ...
Chris's user avatar
  • 14.6k
23 votes

What is that ceiling compartment of a Boeing 737?

It holds a life raft. In case of ditching in the ocean, the raft would be removed from that compartment and tossed into the water, where it would inflate.
Ralph J's user avatar
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19 votes

Other than the rest areas for the crew - what else is in the 'attic' of an aeroplane?

The “attic” is mostly unused. The area above the passenger cabin is also called the crown area. Some aircraft do use part of it for crew rest areas. That area can also used to route electrical wiring, ...
Mike Sowsun's user avatar
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17 votes
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What powers the air-conditioning on commercial planes?

What powers the airconditioning on most airliners is APU or main engine compressor bleed, which is being supplied at fairly high pressure, say, 80 psi, and temperature, around 3-400F, to the air ...
John K's user avatar
  • 130k
15 votes
Accepted

What is the cabin noise hertz in typical commercial aircrafts?

In a jet it's going to be pretty much all above 100hz. Most of the noise at cruise is broad spectrum "white noise" from the air flow and the engine core exhaust. The fan however, running at,...
John K's user avatar
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12 votes
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Why do my ears pop if the cabin is pressurized?

Here is an illustration of how cabin pressure changes during a typical commercial flight: image source: http://aerosavvy.com/aircraft-pressurization/ Note how when the pressure outside the aircraft ...
A. I. Breveleri's user avatar
12 votes

Other than the rest areas for the crew - what else is in the 'attic' of an aeroplane?

The "attic" elsewhere is overhead luggage bins, as on most airliners. See the fuselage cross-section (circle, top right) and #47 in this cutaway of an A350-900, which also notes the crew ...
Camille Goudeseune's user avatar
11 votes

How do bleedless passenger airliners keep cabin air breathable?

tl;dr: Through air intake holes using compression. For example, here they are on the fuselage of a Boeing 787, below the forward edge of the wing: Bottom intake air gets compressed (and thus heated) ...
einpoklum's user avatar
  • 546
10 votes

What is the viability of stacking passengers in an airplane cabin?

The depicted seating configuration wouldn't fit in a typical wide body aircraft. It would require a jumbo platform, such as the 747 or 380. A wide body aircraft can only do 2+4+2 seating, whereas ...
Adam Davis's user avatar
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10 votes
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What's with this non-exit Exit sign on Delta CRJs?

Normally there is some kind of barrier, a bulkhead or curtain, separating the business class and the common folk in steerage. In such a case the sign is to indicate that there is an exit somewhere ...
John K's user avatar
  • 130k
9 votes

What is the viability of stacking passengers in an airplane cabin?

The video shows the seat-pitch at 42". Current seat pitch is typically around 30-33". I'm pretty skeptical that you can increase seat-pitch by 10" and still increase seating, no matter how much ...
abelenky's user avatar
  • 30.7k
8 votes

How do the cabin noise levels of the A380 and the 777 300 ER compare?

From a luxury round the world flight on several different models of aircraft on several different airlines, a traveler used the exact same sound meter at his seat in either business or first class to ...
Pilothead's user avatar
  • 20k
7 votes

Who invented the cabin chime? What aircraft was the first to use it?

I can't definitively identify the true origin of the chimes; but the earliest reference to them I can find is in: ARINC Characteristic 715-3 Airborne Passenger Address Amplifier (PA AMP) This ...
Gerry's user avatar
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6 votes

How do the cabin noise levels of the A380 and the 777 300 ER compare?

As a passenger: In the forward bulkhead section of economy class (lower deck) there is almost no engine noise in the A380. If you listen carefully, you can hear it. I was actually surprised at how ...
Burhan Khalid's user avatar
6 votes

Why are inflatable pillows not allowed on board?

"they can obstruct evacuation in case of emergency situation." Thats the reason. "In my opinion, there is no safety risk" Please describe your qualifications and level of expertise to have a valid ...
abelenky's user avatar
  • 30.7k
6 votes
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Why don't airlines place some physical separator between passengers in the planes to prevent the spread of COVID-19?

Cost. Those would be expensive, and the business is bad already. Now, you might think that just any mesh, fabric or membrane would do, but but to be effective against the sperad of viruses, nope. ...
Jpe61's user avatar
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5 votes
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Is the increased humidity on modern jets artificial?

A Reuters article confirms the humidity just comes from the passengers, on the 787 at anyway: (...) the air is dry and moisture comes mostly from passengers. And this Flight Global article: (......
CrossRoads's user avatar
  • 8,785
5 votes
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Where is the camera in the A320?

There's an option for a tail mounted camera for the passenger entertainment system (PES). It's the same one they use on widebody jets, but it's not hooked up to the cockpit for taxi purposes. Airbus ...
user71659's user avatar
  • 6,609
5 votes
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Why might the crew switch off air conditioning in the cabin of a passenger jet during descent?

Systems vary. Transport aircraft and larger biz aircraft have airpacks handling the AC and at flight idle power settings there is less bleed air, and pressurization is a priority. The packs simply ...
mongo's user avatar
  • 17.7k
5 votes

What is this white smoke like thing, seen inside the cabin before takeoff?

It's condensed water droplets. Outside air with high humidity is reduced in temperature from 28 - 20 ºC (after going through a compression - cooling - expansion cycle), and some of the water vapour ...
Koyovis's user avatar
  • 61.6k
5 votes

How do the cabin noise levels of the A380 and the 777 300 ER compare?

I can tell you that in economy, the 777 noise was, in my opinion, almost unbearable. The A380 was almost silent. I have been on both on long haul to the uk, and their is a world of difference in the ...
paul Wiles's user avatar
5 votes
Accepted

Who controls the cabin air temperature?

The 737-400, -800, and -900 have two cabin air conditioning zones plus the cockpit. The rest have one plus the cockpit. Both packs are on in normal operation because they are slightly more efficient ...
user71659's user avatar
  • 6,609
5 votes

How Cabin Pressures Are Selected?

As a generic answer, the only setting the crew inputs in most pressurization systems is the destination field elevation. This determines the pressure schedule on descent, and the system will use a ...
John K's user avatar
  • 130k

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