Questions tagged [airliner]

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

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If you are in a terrain escape maneuver, would you be able to see traffic above you displayed in the cockpit of airliners [closed]

nayed If you are in a terrain escape maneuver, would you be able to see traffic above you in the cockpit of big airliners
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A very loud, short- lived howl

Within the last eighteen months, I'd say - commercial aircraft descending into Heathrow have started to emit a terrifying, short-lived but very loud whining howl when they pass over my house. They are ...
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11 votes
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Why is this commercial plane making this manoeuvre?

The plane going in circles above my head for an hour now, what could it be?
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Can flaps on Airbus/Boeing airliners be deployed at high speeds during cruise, still?

Brief Background of the Incident Mayday Season 22 Features an Episode "Terror over Michigan" (Episode 6) based on the events of TWA Flight 841. The Episode revolves around a Boeing 727 ...
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8 votes
1 answer
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Improvements in supercritical airfoil design from 1980 - 2000

I originally asked a question (Comparisons between the A340 and 747-200 wing: sweep angle and span) about the technological developments which allowed the Airbus A340 to have a wing with greater ...
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1 vote
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What naca airfoil is the closest to airfoils used by modern airliners?

I know boeing and airbus use propietary airfoils, but is there a single naca airfoil that is fairly representative of what modern airliners use?
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What kind of feedback is this?

i found this link that shows a united airlines intercom feeding back and i was just wondering how typical is this on these flights?? i’ve never heard feedback come back frequently every time the ...
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20 votes
3 answers
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Would it be possible for one airliner to tow another?

Comedian/podcaster/QI elf Dan Schreiber asked on Twitter, as proxy for his 4-year old if it would ever be possible to hook a plane (like a 737) onto the back of another plane, like a train carriage, ...
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Planform Area of Commercial Passenger Airplanes

I am trying to retrieve information on the total area constantly covered by commercial passenger airplanes in flight (that is, airborne planes, not planes on the ground). To this end, I've been trying ...
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33 votes
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What is the operating altitude of jetliners?

I am performing a science project, and this involves knowing the average operating altitude at which commercial passenger airplanes (jetliners) fly. I am trying to find minimum operating altitudes and ...
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2 answers
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Regaining airworthiness of a commercial aircraft

If a large commercial part 121 aircraft has lost it's airworthiness, and remained in that state for several months while being operated despite the loss of the airworthiness, what inspections and ...
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Can airliners take off, cruise and land while unpressurized?

I'm wondering if the pressurization of the cabin has a part to play in the structural integrity of the fuselage, the same way an unopened soda bottle is stiffer compared to one that's open.
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34 votes
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Do airline pilots really put on an oxygen mask when alone in the cockpit above 25,000 ft?

The FAA requires a pilot to put on the oxygen mask if the other pilot leaves cockpit when cruising above FL250. It also requires that one pilot always wears an oxygen mask when flying above FL410. Do ...
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2 votes
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How is airliner pressurization being coped with at high altitude airports? [duplicate]

Cabin altitude in a passenger airliner must not become more than 8,000 ft, but what if an airliner flies to or from an airport at a higher elevation, such as Quito and La Paz? How is onboard pressure ...
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1 answer
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Does the 737 have a higher aspect ratio than most later 7X7's?

In this video: The Insane Engineering of the 787 there's a chart (at around 10:40 in) which shows that the 737 (which series?) has an aspect ratio of over 9, while the 747, 757, 767 and 777 rise from ...
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18 votes
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Would an airliner climb higher late in the flight because of the consumed fuel (lighter airplane) to save more fuel?

Some people said airplanes would fly higher in the late period of each flight, because the fuel is consumed, and the airplane is lighter. Higher altitude and less dense air is enough to support the ...
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Why do white marks on the spinners in front of engines have different patterns? Not Yellow? Omitted for some models?

In aeroailas' answer I understand that the cones in front of the props/fans are called spinners. In Farhan's answer I understand that the ehite marks painted onto the spinners act less as scarecrows ...
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Why large freighter planes still do not use intermodal (ship) containers given that size and shape are not problems?

Recently I found this article this article about the concept of directly sit on a pile of intermodal containers and lock them in place. Whether it is plausible to open such a huge opening ventral of ...
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6 votes
2 answers
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How does IRS estimate the alignment time?

In modern airliners, e.g. A320, once the IRS is starting the alignment process, there is an ECAM message that indicates the alignment time, e.g. ...
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What kinds of altimeter are used in modern airliners?

What's the mechanism of the altimeters in big jets?
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16 votes
2 answers
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How is fuel mass measured in airliners?

Large airliners display the amount of fuel in each tank as a mass (usually in kg or lbs) and not as a volume. This makes sense since mass is important for weight&balance considerations and the ...
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Does the nacelle strut experience reaction forces due to lift, drag, thrust, weight of engine during cruise flight?

Cruise flight indicates that total lift and weight of aircraft cancel and thrust forces generated cancels with total drag forces. However, I am looking closely at the nacelle instead of the whole ...
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7 votes
4 answers
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What navigation actions does a pilot take when simply told to "go around"?

In this recording of ATC during the 2008 crash of a British Airways Boeing 777 at London Heathrow the controller is heard to say "Qatari 011, go around". How would the pilot of Qatari 011 ...
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How to most likely get a flight that will go above 40,000 ft?

I wonder if there are passenger flights that would reach cruise altitudes higher than 40,000 ft (i.e. reach 41,000 ft for instance) more likely than others. It also depends on the plane of course, but ...
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Are supersonic passenger aircraft still realistic? [duplicate]

I was wondering if supersonic passenger aircraft like Concorde or the Tupolev Tu 144 can still be made and flown profitably. The Tu 144 failed because it was poorly designed. And Concord failed ...
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11 votes
3 answers
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Is the compressor required on jet engines? Can air be rammed into the turbine?

In the context of a common airliner (say Boeing 777), when the airplane is on the ground, and the turbines are on, air is getting sucked in and compressed/bypassed. The engine has to do work to ...
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Do redundant angle of attack and sideslip sensors use a voting mechanism, or do they display data directly?

In civil transport aircrafts (featured with dual/triple redundancy), how does airplane's Airflow angle (AoA/AoSS) sensor measurements read by the pilot? By using voter mechanism as used for airspeeds ...
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6 votes
1 answer
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Why hasn't there been a case of an airliner breaking apart and crashing due to turbulence in the past 40-50 years?

Most of the breakups involved clear air turbulence as well, the type that still can't be detected today. Examples like: Boeing 707 (BOAC Flight 911) - which crashed near Mt Fuji BAC One-Eleven ...
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1 vote
1 answer
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How does a headwind affect the distance that a modern passenger jet can glide?

If in an emergency and a modern passenger aircraft had to glide, will it make a big difference if the aircraft had a headwind rather than having to glide downwind to nearest airport?
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2 votes
1 answer
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Could we use ground effect (over water) to increase an airliner's range? [duplicate]

Theoretically, would it be possible to increase the range of a modern jetliner in ground effect over the sea?
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6 votes
5 answers
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What is the principle behind flight of airplanes? [duplicate]

What is the principle behind flight of airplanes? Need a simple answer for grade 7 student. Thank you
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Why was the minimum turbulence intensity that commercial airliners have to withstand increased?

From 50 fps turbulence intensity at VC to 90-100 fps turbulence intensity at VC. The amended FAR design criteria was introduced in 1980 or 1981 for commercial airliners. What prompted this change?
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3 votes
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Are empennage airfoils always symmetric in conventional airliners?

I'm specifically interested in these models: A319, B737-700, A220, E195-E2. You could call these conventional airliners, so I suppose the question is if these "conventional" planes have only ...
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0 votes
2 answers
184 views

How to anticipate the radius and rate of turn under specific conditions?

Given that an aircraft would normally start a turn from straight and level, how would one go about calculating the rate/radius of turn since there would be a delay before the aircraft can get to full ...
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14 votes
1 answer
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Airport location identification from 1960s photo?

Can anyone identify the airport location in this photo? It would have been taken in late 1962 or early 1963 just before this DC-8 N9609Z took on its Canadian registration CF-TJL in April 1963. There ...
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1 vote
5 answers
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In theory, can jetliners remain controllable after losing the entire tail section?

The scenario here is a detachment of the tail,one with the whole empennage. Could a variant of an existing model of swept winged jet airliner be made to remain controllable, using ailerons, ...
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4 votes
1 answer
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Is a braking rotation immediately after touching down a known maneuver?

In this video the airliner landing on grass rotates high up after touching down, looks like more than it would do during take off. Is it a known possible way to drop the speed or it was more for the ...
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13 votes
4 answers
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Could an airliner with only one functioning engine recover from a stall?

If a modern commercial airplane such as a Boeing 787 would stall with only one functioning engine, is it possible for the pilots to right it or would it require two functioning engines?
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15 votes
6 answers
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What kind of problems can a flight have if passenger weight is miscalculated?

There was a widely reported news story about a TUI Boeing 737 flight, where a bug in reservations system caused 38 passenger on the flight to be allocated a 38kg standard weight as opposed to the ...
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16 votes
8 answers
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Could an airliner exceed Mach 1 in a zero-G power dive and safely recover?

(I looked for duplicates. I really did.) Being as it is that "safety" and this are mutually exclusive: I am stupid. I take a cruising A320, apply TOGA power, and push zero Gs until I exceed ...
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-1 votes
1 answer
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What are the difficulties in building transonic airliners?

If the sonic boom is an issue, why don't we build airliners that are capable of flying just below Mach 1? Big airliners fly at Mach 0.85 at most, and the record for current sub-/transonic civilian ...
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5 votes
2 answers
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How much aerodynamic heating do jetliners endure?

At cruise altitude (~ 33,000 ft) and cruise airspeed (~ 500 mph) how much do present-day airliners heat up due to air friction during their journey? Probably not much because there's still ice on the ...
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5 votes
1 answer
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Why are you not allowed to use power sockets in the seats during takeoff and landings?

Is it because the extra strain on the electrical system reduces engine performance?
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1 vote
2 answers
272 views

For jetliners, how is a swept wing justified over a thin wing?

For a given speed, a swept wing is a fatter alternative to a straight, thin wing. But why? Does not the sweep lengthen the wing and make it heavier? Is the swept wing chosen for the extra fuel tank ...
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3 votes
1 answer
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What is the highest number of airliners shown flying together in a single photo?

I was re-visiting this question about a timelapse photo of multiple airliners and started wondering about the maximum number of jetliners that could be photographed together while flying. I have ...
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1 vote
0 answers
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Could an aircraft have squashable wings that get thicker as it flies faster?

As I understand, for high speed subsonic flight a thicker wing is more aerodynamic, and at low speed, a thin wing is preferable. Could aircraft which range in speed from 180 to 620 knots (most ...
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3 votes
3 answers
2k views

What powers the air-conditioning on commercial planes?

How is the air conditioning system on airliners powered? I expect that the air conditioning is powered by the APU powers, but I wonder if there are other power sources used like the main engines?
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1 vote
2 answers
245 views

What information is recorded in aircraft sensor and maintenance logs?

I was wondering what the sensor and maintenance logs in an aircraft look like and what are the values logged? Like maybe the engine temperature, altitude, exhaust temperature, etc. I know the data is ...
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27 votes
5 answers
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Can airliners land with auto pilot in gusty wind conditions?

Why does the pilot make so many movements? I don't see that plane is moving all that much, but his yoke movements are strong and fast. For someone who is not a pilot, it almost looks like panicked ...
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26 votes
2 answers
5k views

Has any airliner ever collided with a glider?

I've read about many near-collisions between gliders and airliners, but did such a collision ever happen in mid-air, actually?
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