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 is the temperature of the brakes after a typical landing?

On an airliner, what is the temperature of the brakes after a typical landing, and how long does it take to cool down? Is it hot enough that mechanics should wait before servicing an aircraft that ...
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Is it technically viable to reintroduce sleeping berths?

The airlines are always trying to jam more passengers into each plane. I'm smaller than today's average, and I'm still often uncomfortable in a standard Economy seat. It occurred to me that in the ...
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What are these antenna-like protrusions for on an airliner?

This is a JetBlue A320: I've always wondered what these are for, but could never find the answer. I'm guessing a few of them are for receiving information from satellites.
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How much does the landing gear compress on a fully loaded airliner on the ground?

When an empty airliner is loaded with passengers, cargo and fuel, the extra weight compresses the gear strut and it sinks. Jet bridges are designed with this in mind. How much height does it actually ...
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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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What is a "Pod-Pak"?

The following image, from the Qantas Heritage Collection (via aussieairliners.org), shows the flight crew inspecting the 'Pod-Pak' prior to departure: Based on the angle of their heads, I'd assume it'...
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1answer
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How much does a D-check cost compared to a new aircraft?

As I understand from those videos, a D-check basically consists in disassembling the whole aircraft, inspecting every little piece, and then reassembling it. For me, the last part seems to be more or ...
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Why are airliner underbellies generally painted differently?

Some airlines, Delta in particular, have dark underbellies on their liveries. Is this only aesthetic or is there a purpose for it?
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Why does the speed of commercial airliners fluctuate, sometimes as high as 1,060 km/h or as low as 800 km/h?

I've noticed that (long-haul) airliners sometimes travel at as high as 1000 km/h (I believe I've even seen 1040 km/h), but usually they fly closer to 800 km/h, for most of the trip. This seems odd ...
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Is flying during the day safer than flying at night?

Is there any correlation between night or day flight time and rate of accidents? To me it seems that there should not be a difference. If an airplane needs to execute an emergency landing, it has to ...
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Is freezing of windows normal in airlines?

Recently I was flying on an Airbus A320. While cruising around 37,000 feet, I noticed half of the glass on the window had frozen. But it was a thin layer of ice. Was it anything to be concerned about?...
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What are the most challenging taxi manoeuvres that a typical commercial airline pilot must execute?

I am currently involved in a University level modelling excercise which looks to investigate the handling qualities of a novel nose wheel steering system. As part of this study, I am interested in ...
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Are there non-economic barriers to a 1000 passenger aircraft?

I know the number 1000 is just an arbitrary number that happens to have some zeros in it, but is there any non-economic obstacle to making a 1000 passenger aircraft? Also, assume normal-ish space-per-...
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Why does an airliner have a shallow descent when heavier, opposite to gliders with ballast?

Gliders utilize water ballast to, among other things, descend faster: But sometimes you need to get down fast: This is when water ballast is added. In airliners however, the heavier the plane, the ...
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How frequent is the use of spoilers during descent?

Having flown a number of flights as a passenger recently, I observed that: Roughly 50% of pilots used spoilers above FL180 Almost everybody used spoilers to pass the 10,000 feet / 250 knots mark ...
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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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Do airliner cabin filters trap viruses or other pathogens?

I understand that half the air in an airliner is re-circulated (per How much air is recirculated (vs. bleed air injected) in modern airliners cabin?). Of this 50% re-circulated air, what it's the ...
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Does windmill restart often work for airliner engines?

There seems to be a certain class of airline accident where an airliner engine flames out followed by further unfortunate events. Very often, pilots are recorded as having attempted to restart a ...
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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 ...
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What happens if a passenger dies mid-flight?

Last month (December 2014), there were news that a passenger passed away during a flight. As mentioned in this answer, it appears that it is not a very uncommon scenario. In an unfortunate incident ...
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Is there a reason for a jet liner to raise the nose wheel early during the take-off run?

This video shows a 727 apparently rotating too soon. The take-off run starts at 2:00 minutes and at 2:11, you can see the yoke is pulled back by the elevators rising. It seems to me that this is ...
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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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Why does the A340 have 4 engines instead of 2?

I have noticed for a while the A340 has four engines and the Boeing 777 only has two engines and they are about the same size. So why can't an A340 have two engines instead of four? A340 . B777 On ...
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How many people can stand on airliner's wings?

This photo of Allegiant Air flight 331 got me wondering: how much weight would a typical airliner's wings be able to hold? Aside: Apparently these folks didn't realise that if they smell gas in the ...
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What exactly are those openings in the bellies of many jetliners?

I have circled the areas (in yellow) under the belly of the 737. What exactly are those? (airliners.net)
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Can the APU provide emergency thrust?

By David Monniaux (Own work) [GFDL, CC-BY-SA-3.0 or CC BY-SA 2.0 fr], via Wikimedia Commons Many larger airplanes have gas turbine APUs (auxiliary power units). It seems that their exhaust is ...
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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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How common are emergency landings for airliners? Is there really more than one per day at Heathrow?

I've just found an article on one of Italy's most popular newspapers, the "Corriere della Sera", which states that emergency landings are far more common than is normally believed: according to it, at ...
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How is the actual ground speed of an airliner measured?

Do pilots have the "ground speed" information available? If so, how is the ground speed measured? Or do they rely on GPS info to calculate it?
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Did commercial airliners have microwave ovens in the past?

So I went on 2 long (total of 16 hours) flights with a major US airline, and they did not provide a free in-flight lunch (grr) during either flight. I had brought a sandwich with me just in case, but ...
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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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Is a dancing crew dangerous?

Recently, the crew of an Indian airline performed a short choreographed dance sequence mid-flight on the occasion of Holi. This is, a not so rare practice amongst low-cost Indian carriers, who ...
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Have any airliners successfully landed on a runway after striking a tree?

There are many examples of aircraft striking trees during a crash sequence, usually with high fatality rates. Have any airliners struck* one or more trees and proceeded to successfully land on a ...
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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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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 ...
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Could a test crew replicate the 1961 DC-8 supersonic dive in a more modern airliner?

The first airliner to ever break the sound barrier was the DC-8, doing so in a semi-famous dive from 52,000' to 35,000' over the Edwards test range on August 21, 1961. Could this supersonic dive be ...
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Was the 727 the last airliner whose doors could be opened in flight?

The Boeing 727, put into service in 1963, had the distinction of a rear doorway with stairs that could be lowered so that passengers could embark and disembark at rural airports which did not have ...
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Why do wings of passenger jet go dark during a flight?

Why do certain areas on passenger jet wings go dark during a flight? This effect is observed on high altitude where temperature is low. When airplane descends, wings return to their initial color. ...
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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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Can a commercial airliner be used for military purposes?

Is it possible that in case of some very serious emergency, a commercial airliner such as the B777F could be used for dropping bombs or to serve some other fighting purpose? I am simply asking about ...
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Are the communications between captain and flight attendants standardized?

Premises For usual communications between pilots and ATC, a specific phraseology is followed. In case of an an unexpected event (e.g. a sick passenger), flight attendants and pilots can communicate ...
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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 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 ...
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How fast does cabin air pressure leak after a total engine failure?

When an airliner loses all engines while at cruising altitude, two things happen: The plane is a glider. It will descend no matter if you want to or not. The cabin pressure is no longer maintained. ...
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How do big planes like 737 manage fresh air for passengers during flight?

How do the big planes (e.g. A380 or 737) flying on high altitudes manage to get fresh air for passengers and crew during the flight? I know the inner space of the plane used for passengers and crew ...
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What is the source for the flight data shown on in-flight entertainment systems?

This question which claims that an altitude of 55,000 ft. was observed on a passenger's in-flight entertainment system on an Emirates B777 made me wonder: What are the normal sources of information ...
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On commercial jets, is asymmetric thrust used as part of normal operations?

I know that when manoeuvring on the ground, asymmetric thrust is often used, for example to assist in turns when taxiing. Are there other circumstances in normal operations which might call for the ...
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Can anyone tell what kind or even which airplane this is?

As stated in this post on the Dutch Police website (Google Translate English version) this morning (12th june 2018), they are looking for all available information concerning the image below. All help ...
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Why does it take so long to develop a passenger aircraft?

I was researching about the Boeing 737 MAX, and came across some information on a Business Insider page: But in the 2010s, Boeing tried to replicate the success of the 737NG with the 737 Max. But ...
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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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