Questions tagged [airliner]

An airliner is a large, commercial aircraft operated by an airline for transporting people and/or cargo.

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9
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1answer
146 views

How is the fuel quality monitored/assured for jetliners?

With tens of thousands of flights daily, many out of smaller and perhaps 'sketchy' airports, it would seem that serious incidents caused by contaminated fuel should happen a lot more often (in a quick ...
37
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7answers
7k views

What prevents a commercial jet from electronically “resetting” the way a computer sometimes does?

I've had a fear of flying for the past several years and one of the ways this irrational phobia manifests is concern over the airplane power-cycling in mid-air: engines cutting out, control equipment ...
9
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0answers
162 views

Can ekranoplans (GEV) be more efficient than traditional airliners?

Ekranoplans or Ground Effect Vehicles (GEV) fly low enough to the ground that their wings stay in the ground effect. This increases lift and efficiency. But GEV fly in the lower atmosphere (...
44
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9answers
8k views

How important is it to have talent to become airline pilot?

The situation that led me to ask the question is as follows: I am a student pilot with only about 10 hours of flight time. I passed the aptitude and personality tests prepared by German Aerospace ...
30
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3answers
19k views

Why don't airliners use in-air refueling systems?

Right now if an airliner wants to fly a really long distance (eg., a Boeing 787 flying from Seattle to Tokyo), it has to load itself down with lots and lots of fuel, which in turn weighs thousands and ...
9
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1answer
5k views

What is the minimum altitude for dumping fuel?

In this question, a comment mentioned that if a 4-engine airliner suffers a 3-engine failure shortly after takeoff, the only way to stay aloft may be to dump fuel. What is the minimum altitude which ...
21
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9answers
7k views

Why are winches not used for towing commercial planes up?

In this video a glider is pulled up by a winch on the ground, like this: (Source) I would say you could apply the same principles with bigger planes, possibly even using sustainable energy sources. ...
8
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1answer
2k views

What was in the noses of airliners before the weather radar?

At the time of the first Lockheed Constellations, airliners fitted with a weather radar were not common, and the navigator was not placed in the airplane nose. Thus, the nose seems to be mostly dead ...
4
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2answers
155 views

Why can't commercial aircraft have a wing boundary layer suction system?

I've read that NASA's boundary layer suction system on the wings can reduce drag by removing the boundary layer through the suction holes. If this can reduce a lot of drag (hence improving fuel ...
37
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3answers
7k views

What's the appropriate course of action if an airliner bounces 5-10 feet on touchdown?

I regularly fly in a PC flight simulator, and I'm currently trying to refine landings in medium-to-large airliners in various weather conditions. A problem I've faced in some conditions while flying ...
4
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1answer
310 views

What is this aviation quote?

I remember hearing a quote about aviation that was something along the lines of “asking a pilot why he loves flight is like asking an artist (or a painter?).....”. For the life of me, I cannot ...
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2answers
383 views

Is it possible to have a fully electric airliner?

Is it possible to have a fully electric airliner? How much room would have to be sacrificed for a power bank in these aircraft to allow similar range to the current models (e.g., A320, 737, etc.)? ...
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0answers
32 views

Airliner fuselage [duplicate]

I would like to know how much thick is a modern airliner fuselage, and which systems are on the plane to mantain the correct pressure of air in the cabin.
17
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3answers
21k views

Why has the folding wing option of the Boeing 777 never been ordered?

The Boeing 777 has an optional folding wing mechanism to fit into tighter spaces, but it has never been ordered by airlines, according to Wikipedia. Why is this option so unpopular? Now with the ...
10
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5answers
3k views

Why didn't Boeing or Douglas make a jet airliner before the British DH Comet?

I was looking at the history of commercial aircraft and was wondering why UK-based De Havilland was the first to produce a jet powered airliner (the DH 106 Comet) when the US had a much bigger civil ...
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0answers
96 views

Why don't commercial aircraft have variable sweep wings? [duplicate]

I was wondering why commercial aircraft don't have variable sweep wings just like the Bell X-5 did? By sweeping the wing further at high altitude it helps the aircraft move faster and also it helps ...
1
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3answers
986 views

How many Inertial Reference Systems are on a commercial aircraft?

Nowadays all new airplanes have GPS on board so the use of IRS may lose importance, still they must be fitted. How many of them are usually on a commercial aircraft? Does the regulation impose the ...
0
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1answer
131 views

Why are there no large turboprop passenger airliners? [duplicate]

If turboprop engines are more efficient than turbofan/jet engines at lower speeds, and have a lower specific fuel consumption, why are there no large passenger airliners that utilize the turboprop ...
2
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3answers
213 views

Why are the first sounds of an approaching enroute airliner low frequency, booming ones?

Often I will hear an intermittent, low frequency, powerful, booming sound that resolves into that of an airliner flying enroute high (FL 300+) overhead. So the first sounds that an airliner flying ...
6
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1answer
442 views

Why do modern airliners have windscreens which open? [duplicate]

I'm sure it must be nice for pilots on a hot day to pop open their windscreen while waiting on the tarmac, but is there a good engineering or safety need for them? There must be a significant amount ...
14
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1answer
1k views

Approx 1948 Brasil Brazil Airliner…what is it? Taildragger?

What plane is this? It's a taildragger, 4 blade prop, twin engine plane. The photo was taken approximately in 1948, maybe in Brazil?
8
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3answers
562 views

Has there ever been an uncommanded lowering of landing gear?

Has there ever been an uncommanded lowering of the landing gear on a large commercial jet? I could not find any instance of it in a preliminary google search. Could a simple short-circuit cause such a ...
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1answer
153 views

Is the “Boom” project vaporware or really going to happen? [closed]

Is this https://boomsupersonic.com viable or more vaporware? Any solid information?
14
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1answer
304 views

What's the plug used on airliners for ground power?

What's the plug pair called? What's the ISO/whatever standard involved? What do they look like close-up? Is it pretty standard today worldwide? Is the plug identical for the hugest airliners as for ...
15
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2answers
6k 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 ...
7
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1answer
867 views

Are there any fly-by-wire airliners with negative or near-neutral pitch stability?

Are any modern commercial airliners with fly-by-wire flight control systems designed with negative or near-neutral pitch stability so that they can take advantage of the capability of such systems to ...
7
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2answers
2k views

Why do airliners still have a switch for the non-smoking sign?

I've wondered why airliners have a switch in the cockpit to turn off the non-smoking sign. Why isn't it illuminated all the time, or a better question: Why is it still there, now that everybody should ...
20
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4answers
17k views

How much does it cost to give an airliner a fresh coat of paint?

Just a random thought I had: the weather gives a jet's paint job a battering; meaning they need to be resprayed approximately once every 5-10 years. (See How often is a passenger jet aircraft painted?)...
20
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1answer
3k views

Is Doppler navigation still in use for civilian aircraft?

Is it possible to find an airliner nowadays with Doppler radar used for navigation purposes?
4
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2answers
592 views

What is the noise level inside the Tu-114's passenger cabin?

Was the Tu-114 as noisy inside the passenger cabin as the Tu-95 bomber was said to be?
6
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2answers
321 views

What are the issues involved in converting a quadjet into a twinjet?

As you are probably all aware already, the fewer engines you have, the better your fuel efficiency. That’s why the airlines are selling off their quadjet 747s and buying twinjet 777s. It's why they’ve ...
27
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3answers
12k views

Why are propeller engines uncommon on airliners?

My experience in aviation is essentially zero, but looking at Wikipedia it seems like the Tu-95 Bear offers high subsonic speed and extreme range. I assume that turboprop engines are more fuel ...
37
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12answers
15k views

Can a passenger jet be towed to safety if it breaks down in midair?

A car can be towed by a tow truck to the repair shop when it breaks down on the highway. Is it possible for a passenger plane to be towed by an emergency tow plane along the air corridor to the next ...
5
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1answer
558 views

What if a commercial airline pilot misses their flight?

Pilots need to arrive at the airport 1 hour before their departure. What if one of them is not able to report on time (due to any circumstances or reason) and also misses the departure time of flight. ...
5
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1answer
132 views

How often do jet-liners have touch and go landings?

I read that a go around is 1-3 out of every 1000 and I wondered how rare it is for a large commercial plane to actually hit the runway before deciding to go back up again.
5
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1answer
178 views

What adds more weight to a twinjet? Tail-engines or wing-engines?

Let's say we have a large commercial jet, with exactly 2 engines, capable of holding at least 200 passengers. It could be a traditional jet like the Boeing 777, where both engines are in the wing. Or ...
0
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1answer
67 views

What are the effects of dihedral on net lift of a wing? [duplicate]

I read somewhere on the internet that dihedral decreases wing lift,so my question is will dihedral decrease the lift of an airplane wing since the wings are attached to the fuselage at an angle ? If ...
20
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4answers
5k views

Was the Boeing 2707 design flawed?

The mach 2.7 capable Boeing 2707 has an interesting design. I'm curious if there has been any studies done that concluded that this aircraft would simply not have worked, given the way it was ...
7
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2answers
368 views

What are advantages and disadvantages of flaperons?

What are some advantages and disadvantages of flaperons? Do they cause some issues or are they top-notch reliable?
31
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2answers
5k views

Why don't modern jet engines use forced exhaust mixing?

Jet engines are noisy[citation needed] - even a modern high-bypass turbofan is still deafeningly loud compared to pretty much anything except the even-louder low-bypass turbofans or a turbojet (much ...
8
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2answers
4k views

What is meant by a “cold soak" of an APU?

What is the exact meaning of "cold soak" of an Auxiliary Power Unit (APU)? Is it to do with long flights at high altitude and the fuel getting cold? Will it affect the ignition of the APU? Can anyone ...
6
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1answer
466 views

Why did the Mercure fail?

The Dassault Mercure was a French regional jet that first flew in 1971 and received its type certificate in February 1974; it resembled an enlarged, shorter-range 737-200, and was designed to serve ...
22
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1answer
2k views

Why does the Antonov 225 needs 6 crew members?

Why does the Antonov 225 need 6 flight deck crew? What are they called and what do they do?
14
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4answers
1k views

What is the chime that can be heard roughly 30 seconds after takeoff?

This may be confirmation bias on my part, this might be impatient passengers pressing the call button, and it might be me imagining things, but it's one of those I've wondered about. I'll try to ...
4
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3answers
593 views

Why is it necessary for pilots to have trim controls on fly-by-wire aircraft?

On Airbus family airliners why is it necessary for the pilots to have the facility to trim when there is no aerodynamic feedback through the flight controls?
17
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4answers
3k views

Do large airliners have a short-field landing technique?

Other than extra braking and reverse thrust, is there a specific short-field landing technique for large jet airliners? In discussions about the famous landings at St Maarten, it is sometimes said ...
5
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2answers
501 views

Why are landing gear retraction mechanisms mostly based on the four bar system?

I would like to know about the principles of landing gear retraction system and I struggle to find clear information about it. It seems to be about a four bar systems in most cases. This seems more ...
10
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3answers
466 views

Is it common for automated control systems to use non-redundant sensors?

While reading an article about the Lion Air Crash with a Boing 737 Max 8, I was very surprised by the following paragraph: In designing the 737 Max, Boeing decided to feed M.C.A.S. with data from ...
10
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2answers
605 views

When were the last subsonic turbojet-powered airliners retired from commercial passenger service?

The very first jetliners (Comet, Tu-104, Caravelle I-VI, 707-120/-220/-320, DC-8 series 10-30, original 720, CV-880) all used turbojet engines, turbofans not being available until later; when ...
16
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2answers
855 views

Have we seen the last significant experiments in the configuration of jet airliners?

By the 1940s, passenger airliners had pretty much settled down on the shape that has dominated the industry since then: a monoplane, with wing-mounted engines, a roughly cylindrical single fuselage ...