Federico
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  • Member for 7 years, 10 months
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What is the viability of stacking passengers in an airplane cabin?
24 votes

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 ...

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Why are some contrails longer than others?
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24 votes

It is a mixture of factors. All else being the same: a contrail at a higher altitude will last longer (the lower temperature slows the sublimation of the ice cristals) a contrail formed in air with ...

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Why do the A220 cockpit seats have a cutout?
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23 votes

As we have seen in a previous question, the A220 is a re-branded Bombardier CSeries. The CSeries started flying in 2013. At the time Bombardier's other commercial jet was the CRJ, that started ...

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Are there regulations for the field of view from cockpits?
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23 votes

The certification specification for aircraft are deliberately a bit vague on the topic. This allows manufacturers to come up with creative solutions that may have been prohibited if specific angles ...

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Can one pilot lock the other out of the cockpit?
23 votes

Yes, see the Ethiopian Airlines hijacking in February 2014. From this BBC article about MH370: The security of the cockpit door offers protection against intruders, but it also prevents action ...

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What is this fighter jet that flew over KJST?
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22 votes

It's an F/A-18 Super Hornet. Defining characteristics: Slightly angled twin vertical tail Twin engine with little space between them (eliminating the F-14 and similar) Almost straight trailing edge ...

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What are these small jets and large propeller aircraft flying in formation?
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22 votes

The design on the belly of the fighters makes it clear that they are from the Patrouille Suisse, the aerobatic team of Switzerland. They use F-5E. From the comment in the page you linked (or from the ...

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How do door seals work?
22 votes

How do they prevent pressurized air to leak from the doors? They don't. The seal does not have to be perfectly airtight. The requirement is that it will create enough impediment to the air that ...

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How is an aircraft aligned at a jet bridge?
22 votes

The Aircraft aligns with the gate through ground markings, radar sensors and eventually ground operators signals. After the aircraft stops the jet bridge is aligned with the aircraft's door by an ...

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What does this formulation mean?
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20 votes

What does mean "fl oz"? "fl oz" means fluid ounce (1 fl oz ≈ 30 ml), which is a unit of volume, as opposed to dry ounce, which is a unit of mass. How are they calculated the 30:1 ...

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What would they call the US President's personal plane?
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20 votes

I'd expect Executive One: Executive One is the call sign designated for any United States civil aircraft when the President of the United States is on board.

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What are these two tail elements of the Avro RJ100?
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20 votes

The one behind is an aerobrake. The tail opens up to increase drag. It is much better seen in this Wiki image: The one in front looks instead like the APU exhaust.

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How does aviation deal with satellite and Moon laser ranging, and other scientific lasers in the sky?
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20 votes

Is there a NOTAM or a temporary flight restriction associated with laser ranging activity? Apparently yes: The lasers on the telescopes are in the range of 15-40 watts. The FAA calls a no-fly zone ...

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What are the differences between various simulator levels?
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20 votes

Here there is a nice tabular representation of the requirements for each level. Wiki provides a handy summary: Full Flight Simulators (FFS) FAA FFS Level A - A motion system is required with at ...

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How are temperature differences handled in a jet engine?
Accepted answer
19 votes

1. The combustion chamber Temperature here is usually controlled via design of the chamber shape, in particular of the location where combustion occurs vs the airflow. Image source In the image ...

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Are there commercial airplanes that are still flyable without any electricity?
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19 votes

Are there any still commercial airplanes in use that are still steerable with complete loss of all electric systems? Do some commercial airplanes still have mechanical backup steering mechanisms? Yes ...

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How does the reverse thrust work while landing?
18 votes

During the landing reverse thrust of an aircraft engine is seen that the compressor fan rotates in opposite direction This is wrong Reverse thrust does not reverse the rotation of the fan/compressor/...

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How dangerous was this approach of a Dash8 Q400 really?
18 votes

According to https://www.flightradar24.com/data/flights/ew9203 it landed at 12:13 local time on 18.01.2018, runway 23L or 23R. the METARs for that timeframe say (emphasis mine) 201801181050 METAR ...

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What is the purpose of having a robotic arm fly a Boeing 737?
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18 votes

The fundamental benefit is that the operator doesn't have to make a lot of adjustments on "legacy" airplanes, they can "simply" install the arm on the existing aircraft that they already have in ...

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Why do airplanes use AC electric power?
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18 votes

AC is easier to produce with the engines, that act as generators. The engines have a rotating shaft that it is easily equipped with magnetic dipoles all around. Then, depending on the instrument, ...

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Can someone explain to me why these planes just don't turn about their center of gravity?
Accepted answer
18 votes

The thrust force from the engine should generate some clockwise moment, right? If we take your photo as a reference (and thus we intend "clockwise in the picture plane"), yes, it is. It is called ...

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What is currently the longest commercial flight in terms of distance?
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17 votes

According to Wikipedia, the flight you are referring to, SQ21, got discontinued in November 2013. The runner up, still from Singapore Airlines, SQ37, got discontinued one month earlier. The same page ...

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What happened to Widereøe flight WF0597?
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17 votes

Your screenshot shows the path for flight WF9480. Flightradar24 shows 2 occurrences of such flight one on the 5th August and one on the 6th August, both are training flights for landing practice. From ...

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When a plane flies faster than the speed of sound, does the distance between plane and sound increase?
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17 votes

I think you are missing some physics knowledge, so let's start from here: If a plane flies faster than the speed of sound Sound is a compression wave that travels through air. Given a certain air ...

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Wind speed over which a Canadair fire fighting plane cannot safely fly?
Accepted answer
17 votes

The problem is not the wind speed per se, but the combination of factors. Let's start from the data; this is the METAR for Athens on the 17th of July, the day of the fires: METAR LGAV 171220Z ...

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What does the small fan do that is visible on Boeing 787 Dreamliners on landing?
17 votes

If you are speaking of the small fan behind the gear in the photo below (click to magnify) Image from here. you are speaking of a Ram Air Turbine, usually used in an emergency, not in normal ...

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Why does supersonic flight detach airflow from a wing?
16 votes

Why does this happen at Mach Speed? ...can it happen at lower speeds? It can also happen at lower speeds, it depends on how the wing is designed and the characteristics of the airfoil (camber ...

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Why do many ram air inlets have this shape?
Accepted answer
16 votes

Those are called NACA inlets or NACA ducts. As wikipedia mentions: When properly implemented, a NACA duct allows air to flow into an internal duct, often for cooling purposes, with a minimal ...

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Are two people required in cockpit at all times on large commercial aircraft?
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16 votes

EDIT: please see at the bottom of the answer the update from EASA Are two people required in cockpit at all times on large commercial aircraft? No. From EASA, pag. 101-102: (emphasis mine) CAT.OP....

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What is an aileron bushing?
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15 votes

Bushings are a type of bearing that has no rotating parts. They are among the oldest bearings known. There is nothing special about it being for ailerons, except that is will be installed on the ...

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