Questions tagged [airliner]

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

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What happens at the wings when the yoke is pulled backwards?

What happens at the wings and vertical stabilizers when the yoke is pulled backwards or forward on typical airliners like the Boeing 747-800. Is it any different for smaller similarly shaped aircraft ...
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What is this device mounted on the fuselage of Lufthansa planes? [duplicate]

I noted the device shown in the photo mounted on top of the fuselage near the tail. The photo shows a smaller airbus (I think) but it is also present on several A380ies, and a Boeing 747. In fact, ...
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Why is Emirates not considering buying or leasing used A380s?

Airlines such as Korean Air are retiring their A380s. They are struggling to find buyers/lessors. In such a scenario, Emirates could easily obtain used A380s at cheap prices. Is Emirates not leasing ...
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Are new airliners less safe than older the two first years after they are marketed?

Looking at the 2014 Allianz Global Aviation Safety Study for airliners: The last generation of aircraft (1974 and forward, including A320 and B737) have a very low rate of accidents: less than 2 ...
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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 ...
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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 ...
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How will the Boom SST not require an afterburner?

The company Boom is developing a supersonic airliner (SST). In one of their blog-entries1 they state they would not need to use after-burners because they use modern turbo-fan engines. Does this ...
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1answer
153 views

What type of batteries are used in airline planes? [closed]

In Embraer 145 and Boeing 777 I mean material, recharge cycle, nominal current and voltages. From the comments I don't understand the difference if the plane is turboprop or turbofan.
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What is the typical voltage used on jet airliners?

I have seen several parts that use 28 Volts DC, is this a standard for jet airliners (e.g., Airbuses and Boeings).
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Are sequenced waypoints still displayed on the Navigation Display / FMS legs page?

This question relates to the Flight Management System of a large airliner, e.g. Boeing 787: During a flight, when the aircraft passes a waypoint, is this just passed waypoint (and the previous ones) ...
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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. ...
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What is the typical touchdown angle of a large airliner?

Following up on my previous question about the typical vertical speed during the touchdown, I am now curious about the typical touchdown angle. Airliners touch down with the main landing gear first, ...
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Why did my business class seat have a three point shoulder harness?

I recently rode a short haul international flight on Asiana Airlines AAR111 from KIX to ICN. I was surprised that my business class seat had a three-point shoulder harness given that we’ve discussed ...
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Is the air bleeded from the engine to maintain cabin pressure for airlines heated or cooled [duplicate]

Is the air bleeded from the engine to maintain cabin pressure for airlines heated or cooled. If heated, what device is used, if cooled, what device is used and in both cases how much energy does it ...
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What is the typical touchdown vertical speed of a large airliner?

What is the vertical speed (range) of a Boeing 787 (or any other large commercial aircraft) that should be achieved just before and during touchdown? I'm not interested in the vertical speed during ...
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What is the maximum nose wheel deflection angle?

What is the maximum nose-wheel angle of deflection on modern commercial aircraft such as the Boeing 787? Can it deflect to 90 degrees or even more?
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How much fuel is used for the different phases of the flight of a typical airliner?

An Airliner flies from LA to JFK in 5 hours. In the first 30 minutes the plane climbs to about 30,000ft. For the next 4 hours the plane flies at about 30,000ft. For the next 30 minutes the plane ...
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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 ...
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What components of the Boeing 787 are made out of titanium?

Inspired by the question, Why is the 787 tail cone made out of titanium?, I want to know what other parts of a Boeing 787 are made out of titanium. We now know, the APU exhaust cone is made out of ...
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Is Doppler navigation still in use for civilian aircraft?

Is it possible to find an airliner nowadays with Doppler radar used for navigation purposes?
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How much does it cost to design a jetliner's wing?

The cost of designing a brand new wing for a jetliner, compared to modifying an existing one—with or without the changes to the production line—how is it estimated? Related questions that come to mind:...
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What is the purpose exactly of a ‘Control Check’?

I recently watched an Air Crash Investigation episode where Qantas flight 32 lost an engine shortly after takeoff. It was revealed that a stud pipe in a Rolls-Royce engine was made incorrectly, ...
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What are the design parameters for airliner safety?

Airliners designed to carry multiple airfare paying passengers are regulated by CFR 14 Part 25, and by EASA CS-25. The design regulations are such that the probability of a catastrophic failure with ...
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What is the average weight difference between composite and metal airliners?

Is there any rule of thumb for weight savings using composite materials. For example, is there an early model large airliner like the B747 or even B737 that later was modified with composite wings or ...
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Could supersonic transport make a comeback? [duplicate]

When the Concorde was retired from service, reasons given included: It was expensive to operate; it burned a lot of fuel and had high maintenance costs, resulting in high ticket prices Could only ...
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What type is this aircraft and engine at Munich airport?

Please help me to identify the plane and engine.
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What is the purpose of the little eyebrow windows on the Boeing 737? [duplicate]

Anybody know what these windows were used for?
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Do modern airliners have oxygen sensors in the cabin?

I know that airliners have pressure sensors to check the cabin pressure, and thus check if we can breathe (and get enough O2) inside it so we don't get hypoxia. But that got me thinking: Is there any ...
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How are electronic systems locked and connected in the electronic bay?

On aircraft the electronics bay contains multiple systems, e.g. for the A320: A320, photo by B-2230, source: JetPhotos How is the electronic equipment locked (it seems there are two mobile screws) ...
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When a typical commercial airliner flies overhead, what is the actual noise we are hearing?

We're all familiar of the sound planes flying quite high overhead and you hear a faint drone, even when planes are lower to the ground you hear them scream at a slightly higher pitch, but what exactly ...
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Would titanium be a better option for aircraft skin if cost were not a factor?

If price was not an issue, would titanium be a better option to use as the skin of airliners as opposed to aluminum?
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What material is used to make engine covers for passenger airliners?

What material is used to make the engine shrouds for passenger airliners?
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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?
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At which point does an airliner start to pressurize/depressurize the cabin?

Do airliners start changing cabin pressure at takeoff or after reaching a certain altitude? Also when do they start depressurizing the cabin ?
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Why were 'business jet' airliner designs so popular in the past? [duplicate]

Let's look at the MD-83 (was Microsoft too poor or they lazily didn't want to waste time to make it flyable in FS2004/FSX?) and the Learjet 35 (yes I used FS95/FS98 in the past). Now, there are some "...
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Where do flaps and elevators get input from?

How are flaps and elevators controlled in both a fly-by-wire or manual airliners? Is it from the yoke or the joystick as in Airbus or military aircraft? For how long and in what stage of the flight ...
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Are there big differences between Douglas Commercial 3 and Douglas Commercial 4?

I always thought of the DC-4 as a DC-3 with two added engines and somewhat improved hydros. What are the actual differences between them?
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What throttle setting does an airliner use while cruising?

As a passenger, I have always felt like the engine are not kept at take-off thrust/full throttle a few (tens of) seconds after take-off, and so for obvious reasons as fuel efficiency, engine wear ...
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How much of an improvement would a 1% weight decrease on an airplane be to the industry?

Say I thought of a very easy and inexpensive way to reduce the takeoff weight of a commercial airplane (body, fuel and passengers) by 1%. How much would this mean to the industry? Would it make much ...
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Estimating the fuel required in terms of flying distance and total weight [duplicate]

I am looking for a mathematical model to estimate trip fuel required. I have searched the internet but not found any specific mathematical model as such. The question is formulated as follows: Let $...
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492 views

How do airlines without assigned seating verify cargo balance? [duplicate]

How to approximate the mass of passengers is well explained, but balance of the aircraft is concerned more with where they sit. Other answers have hinted that assigned seating locations are one method ...
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Does cargo balance affect fuel efficiency in commercial aviation?

Positioning cargo such that the center of gravity of the plane is within a certain range is essential, but is there any advantage to having the center of gravity closer to some ideal point within the ...
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Why aren't there V-tail airliners?

Since a V-tail is lighter and generates less drag than a conventional empennage, why has this solution been put away from production?
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What are SIDS and STARs?

I’ve been exploring the FMC(flight management computer) on the PMDG 777 and noticed that under the route section you can insert VIA and TO points. From what I’ve learnt this is where you would insert ...
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Why do airlines not use direct routes?

Why do airlines use SIDs and STARs when flying IFR. Wouldn’t it be easier and make more sense for them to use direct routes (for example KDFW.KLAX instead of KDFW.L4D.ZIBIT.J5N.BUBIN.P3K.KLAX (not a ...
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Is there any kind of removable ELT on board an airliner? [duplicate]

Is there any equipment similar to an ELT on board on airline airplanes as for GA aircraft? Something that can be removed from the wreck in the event of abandoning the site of the crash.
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How much force are large aircraft brakes able to exert?

In a comment left on my answer here Jan Hudec says: Note that usually on dry surface the brakes exert much less force than the tires could handle. This got me wondering how much force large ...
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Does EASA require airliners to be fitted with autopilots?

For EASA OPS requirements, must an airline transport airplane be fitted with an autopilot system?
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Do modern aircraft have sensors to determine weight of the aircraft? [duplicate]

Do ALL modern aircraft, particulary airliners and private jets, have weight sensors on all landing gear to determine take off and landing weight in real time so as to determine take off speed and ...
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Is more cargo loaded if there is less passengers than expected?

When pre-flight weigh in is done, if the plane weighs less than expected because people don't turn up, is more cargo added? Conversely - if the plane is over the estimated weight - does cargo get ...

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