Questions tagged [airliner]

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

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95 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 ...
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1answer
113 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 ...
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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 ...
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1answer
429 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 ...
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1answer
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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?
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1answer
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Is the “Boom” project vaporware or really going to happen? [closed]

Is this https://boomsupersonic.com viable or more vaporware? Any solid information?
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1answer
288 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 ...
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1answer
516 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
131 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.
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1answer
151 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 ...
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1answer
62 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 ...
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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 ...
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274 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?
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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 ...
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2answers
121 views

Can jetliner pilots program departures when specific RNAV procedures do not exist?

Can commercial pilots (e.g. 737 and 737 Max) program departures into their on-board GPS navigation system for the first portion of a flight that doesn't have specific RNAV procedures?
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3answers
357 views

Is it legal to bring your own survival gear aboard an airliner?

Is it legal to bring your own survival gear aboard an airliner? Considering the sobering article by William Langewiesche that is appearing in the July 2019 edition of "The Atlantic", one might want ...
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1answer
150 views

Is it possible that commercial airliners use an EMALS or other form of electric launch? [duplicate]

I am doing a big project for school over the summer, and was wondering if anyone can help? I just want a professional opinion on the idea. Is it possible or no?
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Could wing tilting be a mechanism for VTOL and high angle of attack for jetliners? [closed]

My question is about turbofan airliners, could an airplane tilt its wings 90 degrees so that the fuselage horizontal axis is perpendicular to the longitudinal axis of the turbo fan. This way an ...
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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?
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Why is the tail group of virtually every airplane swept instead of straight?

Even low performance airplanes like ultralights have their tail group (vertical and horizontal stabilizer with rudder and elevator) swept backwards knowing fully well that a straight tail group will ...
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2answers
535 views

How much does it cost to lease a jetliner?

As the title says, how much would it cost to lease a airplane for an airline. Let's say a B737 and a B747 or similar aircraft. I tried to contact several aircraft leasing companies but so far I've ...
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2answers
190 views

Can an airliner be landed with only the auto pilot or remotely?

In this question: How autonomous are commercial passenger airliners? explains how automated the auto-pilot system can be. Could a pilot or more work the controls of the auto pilot that does not have ...
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1answer
363 views

What is this aircraft on the grass in Budapest International Airport?

While taxiing after landing in BUD recently, I noticed a widebody aircraft half-hidden in the trees on the grass of the airport. You can see it on Google Maps over here. What is this aircraft, and ...
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1answer
138 views

Is there a Risk of Tail Tipping during Push-back of a passenger aircraft?

I remember that there were countless incidents occurred in which the aircraft sits on the tail as the aircraft was heavily loaded at the back of the cargo and/or cabin compartments or the cargo ...
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1answer
135 views

Airliner speed when descending through 10,000 feet

How do airliners get to 250 kts when descending through 10,000 feet as required by the FAA? Do you level off at 10,500 feet until speed is less than 250 and then descend further? Must pilots ask ATC ...
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251 views

How much does it cost to ground a B737 max aircraft for an airline?

What are the cost items for which an operator with such an aircraft in the fleet incurs per aircraft because of the grounding of the Boeing 737 max aircrafts and how much is the average cost incurred? ...
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371 views

Are there any current projects/plans for a VTOL passenger airliner?

I was very surprised to see there's a seemingly underway project for a VTOL "business aircraft" that seats a few people. http://xtiaircraft.com , https://www.startengine.com/xti-aircraft They ...
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Which airlines allow you to gain hours with them by paying them [closed]

As a fresh grduated pilot is there any airline that you can pay them to fly with them without a salary just to build hours?
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1answer
729 views

What are the difference between FMC, FMS and MCDU and what do they do? +2 more questions [duplicate]

What are the difference between FMC, FMS and MCDU and what do they do? Do airliners have all of them or just 1 or 2 of them? Do pilots learn how to program them/it? FMC = Flight Management Computer ...
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4answers
528 views

Why do aircraft stall warning systems use angle-of-attack vanes rather than detecting airflow separation directly?

Stall warning and protection systems on essentially all aircraft work by using several hinged vanes on the side of the fuselage (usually at least three, and preferably more), which align themselves ...
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707 views

What do you need to do to bring a 737 Max back in service after 6 months in storage?

What kind of maintenance has to be performed on an aircraft if it has been stored for 6 months? For example, do fluids need to be changed, have the tires become flat, etc.
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3k views

Do airline pilots ever risk not hearing communication directed to them specifically, from traffic controllers?

I gather pilots communicate regularly with air traffic controllers within air traffic controllers' jurisdiction or airspace as they enter the space, during their time in that space and as they leave. ...
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492 views

Why aren’t there any lifting-canard airliners?

A lifting-canard aircraft, such as the Long-EZ, is an aircraft with the main wing at the back end of the fuselage and a pair of small, highly-loaded canards attached to the forward fuselage; the ...
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1answer
535 views

What is this plastic device inside the plane window?

I saw this on a recent domestic flight. It was glued on all the windows of the plane, behind the first layer of plastic. What is it and its purpose?
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4k views

For airliners, what prevents wing strikes on landing in bad weather?

For any low-wing aircraft, particularly the MD-80 or some of the private jets, CRJ's, the wings appear about 5ft or less above the ground. It seems that just few degrees of roll before touchdown would ...
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1answer
113 views

Are hydraulic retractible landing gear possible

One of the impediments and drawbacks to extending landing gear in light of building larger engines are the larger space required for the taller gear. Would hydraulic retractable gear that works as a ...
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4answers
2k views

Are taller landing gear bad for aircraft, particulary large airliners?

Buiding larger engines for larger aircraft as opposed to smaller but many engines has proved to result in more fuel efficiency. Having established one of the main drawbacks or impediments to building ...
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1answer
448 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 ...
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3answers
168 views

What happens to unstrapped passengers if the airliner were to fly inverted [closed]

If for some reason or the other, because of an emergency, or perhaps craving jail time or did not want her job, or perhaps a girls will be girls moment, a pilot and her captain decided to fly a large ...
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5answers
376 views

Do horizontal stabilisers provide any lift?

Do jumbo and smaller airliners' horizontal stabilizers provide any lift? Apart from maintaining the aircraft's angle of attack, can they perform the dual function that includes adding some lift as ...
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2answers
2k views

What is a 73W aircraft [duplicate]

With all the issues surrounding the Ethiopia crash can you tell me what a 73W is? Is it a 737 Max 8. We're trying to figure out if our flights with Westjet on Friday might be effected. Thanks ...
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3answers
452 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 ...
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2answers
390 views

Are any airlines actually flying the Comac ARJ21?

The Comac ARJ21, China's answer to Embraer's regional jets, was launched with great fanfare in 2016. However, if FlightRadar24 is to be believed, launch customer Chengdu Airlines does not appear to ...
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1answer
241 views

What is the stability of a 777-like plane if the engines flameout and the autopilot disconnects and the pilots don't make any inputs?

According to Wikipedia: If no control inputs were made following flameout and the disengagement of autopilot, the aircraft would likely have entered a spiral dive and entered the ocean within 20 ...
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1answer
148 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
452 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 ...
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1answer
132 views

Who made the first high-wing jet airliner?

I thought the only high-wing jet airliners were made by the Soviets but the British Aerospace RJ-100 and Dash 6 series twizzled my mind. So who made the first high-wing jet airliner?
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Why there are nearly no upper wing jetliners? [duplicate]

Whenever I look at the western airliners. All of their wings are always mounted on the lower part of the fuselage except the Dash 8 series which have turbo props. But the Soviet jetliners have their ...
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1answer
318 views

When does a passenger plane leave the cruising phase?

I have Flightradar24 data here. Which are in the following structure. ...
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2answers
287 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 ...