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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What aerodynamic improvements were introduced on the Boeing 787?

When discussing the Boeing 787, three topics are brought up most often: 1) The new, extremely high-bypass GEnx engines 2) The shift to carbon composite construction and 3) The significant troubles ...
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4 votes
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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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12 votes
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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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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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3 votes
1 answer
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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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3 votes
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 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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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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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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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 ...
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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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20 votes
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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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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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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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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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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 ...
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4 votes
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 ...
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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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Would the wings of a Boeing 787 be snapped off in the same turbulence in which a DC-8 lost an engine and parts of a wing?

From forbes.com: In 1992, a DC 8 cargo aircraft suffered turbulence so severe over the Front Range of Colorado’s Rocky Mountains that its left outboard engine was completely ripped off as well as ...
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How does this very long tube deployed from the back of a 787 measure pressure? [duplicate]

Photos in the CNET's Up close with the first Boeing 787-9 include the one below with the caption Boeing 787-9 at Farnborough The back of the first 787-9 has coiled tubing extended from the back of ...
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Who else is using electro-thermal wing anti-/de-icing apart from the 787?

I am researching into deicing technologies for the future, but apart from Boeing with Ultra/GKN, no one seems to be picking this technology up and being competitive. Any one know why this is? Is it an ...
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Wind correction on downwind during circling

A timing must be started when flying abeam the threshold on a circling approach. The FCTM of the B777/787 mentions 35 seconds and the SOPs of the Embraer 190 30 seconds. Do they need to be corrected ...
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Why does load shedding still occur in jetliners (e.g., 787) when there is so much power available?

I had a few questions about how electrical generator works on an aircraft, the 787 to be specific although I know it is similar for all aircraft. So the 787 engines have 2 VFSG each which are rated ...
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Is there a way to calculate the difference in pitch required to reach a certain vertical speed? [closed]

I am programming an autopilot for a 787 flight sim software and I've been having a problem. I'm trying to simulate a PID that controls the pitch of the aircraft In relation to the vertical speed ...
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9 votes
1 answer
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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 ...
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How does a HUD track a runway?

I was looking at the FCOM of the 787, and I came across an interesting thing. There is an HUD takeoff selection on the SID selection page. It got me to wonder, how does the HUD track the runway from ...
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1 vote
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Can the Mexican presidential aircraft be sold?

I have read that the next Mexican president is trying to sell the B787 that serves as presidential transport, and that it was already made an offering to Boeing for it. As far as I know, the VIP/...
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What is an "all-electric APU"?

Understand that the APS5000 used in the B787 is the first all-electric APU for large commercial aircraft. Source: http://www.pwc.ca/en/engines/auxiliary-power-units Sorry if this sounds too ...
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Will the new Boeing NMA be 'more electric' than the current B787?

I understand that the B787 is the 'most electric' aircraft to date, however there have been many issues with the plane, and I'm interested in knowing if the latest Boeing New Midsize Aircraft (NMA) - ...
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What is the flight time from Beirut to Paris using different aircraft?

If the distance between Beirut and Paris is 1985 miles / 3194.55 km / 1724.92 nautical miles, and a flight using Airbus 320-200 take 4 hours and 40 minutes, how much would it take using the following ...
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How does the Boeing 787's Cabin Air Compressor work? [closed]

How does it work in normal, overheat and over-pressure conditions? What is the function of the variable diffuser actuator?
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61 votes
4 answers
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How can a two-engine B787 create three contrails?

Today I noticed overflying aircraft (over Sydney at FL400) which appeared to have three contrails. When I checked Flightradar24 app, I saw that this overflying aircraft is B787. What would be the ...
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3 answers
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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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0 votes
2 answers
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Delta fleet plans - all Airbus? (and Bombardier) [closed]

With Delta ordering A321neos and C-Series not 737 Max 10s, A339s, A359s instead of 789's, might Delta be on their way to an all-Airbus fleet? Or going away from Boeing? Was the 737 Max vs A321neo ...
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What is the purpose of the 787 engines extending on landing? [duplicate]

As seen about 53 seconds into this video of the Qantas Dreamliner landing, the engine housings seem to extend upon landing. What specifically is the purpose of this? To balance? To help with air flow?
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What is the purpose of long endurance test flights?

Well known is the last long endurance test flight by a Boeing B787-8, which drew its shape in the air for 18 hours while on a long endurance test flight: https://www.wired.com/story/boeing-787-8-...
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What happens if full thrust is applied at cruise altitude for 5-10 minutes on a 787?

What happens when you apply full throttle to the engines of a Boeing 787 at cruise altitude for 5-10 minutes? Other than wasting fuel, what maximum speeds are reached? Does that pose any danger or ...
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12 votes
2 answers
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Why does the Boeing 787 use Cabin Air Compressors (CACs)?

What are the advantages of this new air conditioning system compared with the traditional engine bleed systems? More engine output power, or easier adaption to future aircraft design?
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2 votes
2 answers
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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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What is the sweep angle of the Boeing 787's horizontal stabilizers?

What is the sweep angle of the horizontal stabilizers on a Boeing 787 Dreamliner? Does it have to be equal to that of the wings, and how is it determined?
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3 votes
3 answers
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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 ...
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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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1 answer
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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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Why is the 787 tail cone made out of titanium?

In this question there is a drawing of a 787 that shows that the tail cone is made of titanium. Why is such a heavy-duty material like titanium required for the tail cone? I do not see how there ...
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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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8 votes
1 answer
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Why do the emergency oxygen masks for some 787 premium class seats have an extra 'streamer' to pull them down?

Specifically, on Norwegian 787s, you are briefed: "In economy seats, reach for your mask. In premium seats, pull the streamer for the mask to drop the full distance." (source) Now the ...
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Why does the Boeing 787 have fewer cockpit windows?

Why does the Boeing 787 have fewer cockpit windows? The 787 has only 4 cockpit windows, whereas other airplanes have 6. Here is a comparison between the 787 and 777: ^ 787 V.S. 777 v
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