Questions tagged [boeing-787]

A twin-engine widebody jetliner produced by Boeing since 2007, typically carrying between 242 and 440 passengers. Notable for being the first Boeing jetliner to utilize composites for a large portion of its structure.

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Gear down on climb out [duplicate]

i saw on a live stream from Manchester, that a Virgin A330, left the landing Gear down for 2-3 Minutes after take off, a smiliar scenario i saw on a stream from Heathrow, where British Airways and ...
14 votes
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Why did the Boeing 787 switch back to separate IRS systems?

The Boeing 737 uses two independent IRS systems (see also Why are there two IRS switches on the 737NG?): (source: 737 NG FCOMv2 (11.10.21 - Flight Management, Navigation - Controls and Indicators)) ...
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787 Dreamliner - What's the weird "thudding" noise I hear before take-off and landing

Frequent and a maybe-a-little-too-nervous flyer here. Recently I've been taking the ORD-WAW course with LOT on the 787 Dreamliner and started noticing a sound that's been a little spooky for a person ...
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Why some airliners have autostart and others don't?

So some of the more modern FADEC equiped planes (specifically airliners like the 787) have autostart and will self monitor the engines during startup. The one thing that confused me was how a 747 ...
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Is there any position I can get gps signal on Boeing 787?

As an aviation enthusiast, I use some apps like garmin pilot to capture gps signal on planes to track plane routes. But I found that I can't get any gps signal on 787. I guess the reason is the ...
14 votes
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How does the Boeing 787 Dreamliner's glide ratio compare to other airliners?

I just saw a documentary on the design of the Boeing 787 "Dreamliner" and one of the designers said that the wings were inspired by gliders. Looking at the production version of the plane, it is ...
18 votes
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What is the purpose of the fin at the Boeing 787 APU exhaust?

The fin is located under the Boeing 787 APU exhaust as shown in the picture below. Does anybody know the application of this thing or it is used for 'guiding' the APU exhaust? Thanks.
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Why did my flight leave the gear down for the first 10 minutes of flight? [duplicate]

This morning, I took flight VS156 from LAS to LHR, aboard a 787, tail number G-VSPY according to flightradar24. The pilot made a strange announcement before takeoff - specifically, that due to a ...
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Does the 787 vertical stabilizer have a connection fairing?

In general, a vertical stabilizer connected with the fuselage will form junctions. The junctions trigger a mix of airstreams, and causes interference drag. A fairing is used the ease the sharp ...
7 votes
3 answers
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United’s 787-9 upgrade [duplicate]

I read this article about United increasing their performance of the 787-9. More specifically increasing thrust and range, But it says this will be done over software. How do you make an engine burn ...
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How do tyre pressure sensors in aircraft work?

I am specifically interested in the sensors used on the B777 and B787.
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4 answers
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Who is the owner of the world's only private Boeing 787 Dreamliner?

I have just stumbled across this video and I was wondering, if anyone knows who is the owner of this particular airplane (world's only private Boeing 787 Dreamliner)? I mean a man or a company -- an ...
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What is the fuel burn of a 787-9 on a ferry flight?

I can't find any literature on 787-9 fuel burn for ferry flights, meaning no cargo or passengers, just crew. An 787-9 burns about 5400 litres when on normal commercial service. How does it change when ...
4 votes
2 answers
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What aerodynamic improvements were introduced on the Boeing 787?

When discussing the Boeing 787, three topics are brought up most often: The new, extremely high-bypass GEnx engines The shift to carbon composite construction and The significant troubles Boeing ...
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1 answer
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What protections and feedback does the fly-by-wire of the Boeing 777/787 provide?

I know the Boeing 777 and 787 run on Fly-By-Wire. I was wondering: Do they have the Alpha Floor or Flight Envelope protections Airbus aircraft have? Do they have force feedback/force feel? The 737, ...
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Why did this flight, that usually flies around 40,000ft only fly at around 29,000ft for the route?

Looking at the flight BY6272 BRS-PMI, it was considerably delayed and flew (according to the flight radar app) at 29,000 feet rather than its usual 40,000 for this same route. It is a Boeing 787 ...
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What is the aerodynamic impact of the curved/crescenteric wing of the Boeing 787? [duplicate]

From certain angles (see pictures below), the wing of the Boeing 787 seems almost curved/crescenteric in shape, particularly closer to the wing-tip. While the Boeing 787 makes use of "raked ...
21 votes
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Does the B787 (Dreamliner) operate with higher cabin pressure?

The Boeing 787 Dreamliner's fuselage is almost completely made of composite carbon fibre material, which is not susceptible to metal fatigue. The main reason why the cabin pressure in a pressurized ...
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Why do B787 Dreamliners more often fly at 42,975 ft rather than at 43,000, according to flightradar24?

The A350 and the B787 are the only passenger airliners that can be seen cruising as high as 43,000 ft on flightradar24 (with the exception of a B747 I once saw). However, the B787 is more often found ...
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What are these paint patches on this 787-8?

What are these paint patches on this British Airways 787-8 (G-ZBJB)?
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What is the purpose of the tiny doors used by the 787's laminar control?

The recent Oct 2021 YouTube video (The Insane Engineering of the 787 by Real Engineering) in the related question remarks: [...] tiny doors whose purpose are a mystery to me with little to no ...
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Which commercial aircraft can perform a parallel engine start?

In various Youtube videos, e.g. this one, one can see that the Boeing 787 is capable of a parallel engine start (both engines are started at the same time). Are there any other commercial aircraft ...
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Is there any practical benefit of the Boeing-787 to perform near vertical takeoff?

In a promotional video for the Paris 2015 airshow, this video was released promoting the new Boeing 787's near vertical takeoff capability. Whilst highly impressive, I was wondering if there is any ...
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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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What is the correct range of the 787-10?

There are two conflicting values for the 787-10's range; they are: 6,345 NM (11,750 km) -- boeing.com 7,000 NM (12,975 km) -- on the same website few years ago, as well as flightglobal.com Note: In ...
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Why would a stretch variant need a larger horizontal stabilizer?

With the 787-10 stretch, Vedad Mahmulyin (a Boeing engineer) saved the company millions by implementing a software solution that negated the need to enlarge the horizontal stabilizer. Software again ...
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Why is there such a large price difference between the A350 and B787?

What are the reasons for quite significant difference in price between the Airbus A350 and Boeing 787? List prices for the A350-900 and 787-9 are around 317 million USD and 190 million USD ...
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How much fuel did this Boeing 787-9 have on board for this flying display?

Once I saw how an Airbus A350 did a validation flight prior to an airshow and flew back to Toulouse from London Farnborough without landing/refuelling (distance: 550.57 mi (886.06 km)). I thought that ...
22 votes
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What is a gust alleviation system?

Reading about the 787 it says it has an active gust alleviation system similar to the system used on the B-2 bomber. [1] The gust alleviation patent says: The gust alleviation system picks ...
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1 answer
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What is the maximum pitch for the Boeing 787 Dreamliner?

I recently watched a video of the Boeing 787 training before Farnborough. This aircraft climbed very fast; does someone know the maximum pitch of this aircraft?
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Does the yaw damper require manual activation on modern airliners?

Modern commercial aircraft are equipped with yaw dampers. This post explains the feature. Now I was wondering if there is a button to manually activate and deactivate it (e.g., on a Boeing 787) or if ...
4 votes
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Which engines do airliners start first?

I noticed many planes, especially Boeings (correct me if I'm wrong anywhere), start engine "2" first and shut down engine "2" last. However, I was watching an Airbus A350 cockpit video when I ...
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Is the 777X actually the newest Boeing plane?

I don't think the 777X is actually the newest Boeing plane (in april 2020), since it's only a new variant of a previous Boeing plane. So the actual newest plane would belong to the 787, since it's the ...
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How is the range/fuel computed when there is a 3-hour difference for the same route?

I am not a pilot. I recently took a trip SIN-SFO 14 hours (tailwind) and SFO-SIN 17 hours (headwind), flying United. According to the Dreamliner Wikipedia page, the 787 range is 7,635 nmi (14,140 km),...
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Can the 787 mini navigation display be controlled independently from the ND?

Some aircraft, e.g., the Boeing 787 have the option to display a "Mini Navigation Display" on the left Outboard Display Unit, right under the Primary Flight Display: (image source) Is the ...
35 votes
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What are the effects of the Boeing 787's very flexible wings?

I recently came across this picture of the Boeing 787 series aircraft's incredible wingflex: I suppose this is a consequence of using very light CFRP wings, but how does the wingflex itself improve ...
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Are electromechanical actuators used in aircraft other than the Boeing 787?

Are there any large (non-experimental) civil or military aircraft that use electromechanical actuators (EMA), other than the Boeing 787?
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Why do flight attendants on the 787 lock the dimmable windows at different phases of the flight?

I’ve heard of many passengers complaining about the FAs locking the dim setting at different phases of the flight. Seems to be something the passengers definitely don’t like. And the passengers cannot ...
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Is there any information about the Boeing 787 L/N 6 (ex-Mexican Air Force One)?

That Boeing 787 (L/N 6; N787ZA then XC-MEX) is (was) the Mexican Air Force One, and recently there has been some turmoil about if this is was acquired under lease or if it was a full purchase. I was ...
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How does the nitrogen generation system in a Boeing 777 work?

How does the nitrogen generation system in a B777 work and how does it differ from that used in a B787? Any diagrams will be appreciated.
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What is the correct IATA airplane designator for the Boeing 787-10?

Wikipedia claims 781, most other sources say 78J. I can't find anything authoritative, and IATA has the gall to want US$578 for ...
21 votes
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Could the Boeing 787-9 near vertical takeoff demonstration be performed by Airbus A350 aircraft?

I am an aviation enthusiast. A couple of months back I came to know about the difference between piloting Boeing and Airbus planes here. What are the main differences piloting Boeing vs. Airbus ...
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How come Boeing invested \$32 billion on the 787 program and Airbus only \$15 billion on the A350?

How come Boeing invested \$32 billion on the 787 program and Airbus only \$15 billion on the A350? (according to wikipedia)
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Did any Boeing 787 operator achieve the 20% fuel efficiency improvement over the 767?

Is there any airline which are able to get the complete 20% fuel efficiency on their 787 with respect to 767 it is going to replace, as told by Boeing. I have read that one of the early customer like ...
11 votes
1 answer
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How much time it will take a B787 to fuel completely when empty?

When a big jet like B787 needs to be fueled with empty tanks, ideally how much time it will take to go full?
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1 answer
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Why do Airbus and Boeing have different approaches to bleed air systems? [closed]

Reading Wikipedia and other questions like this, made me curious as to why Boeing uses bleedless architecture for its B787, while Airbus thinks differently for its A350 XWB (and Rolls-Royce thinks the ...
5 votes
1 answer
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Are Dreamliner windscreens periodically replaced irrespective of damage?

Does Boeing have a statute that commands that the windscreens are changed for new irrespective of no signs of damage or fatigue, and if so, what are the intervals, for safety reasons?
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Does the 787 gust alleviation system make a more comfortable ride or for a more stable aircraft?

The 787 active gust alleviation system, similar to the system used on the B-2 bomber, improves ride quality during turbulence. Ride quality in a B2 bomber means a more stable weapons platform. Ride ...
31 votes
3 answers
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In what circumstances could a 787 stay powered on continuously for 248 days?

The FAA has issued an airworthiness directive for the 787: SUMMARY: We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 787 airplanes. This AD requires a ...
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What does "share a type rating" mean?

The Boeing 787 shares its type rating with the 777, but what exactly does that imply? Surely it cannot mean any 777 pilot can just jump into a 787 and fly it. While being similar, the 787 has some ...