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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 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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1answer
348 views

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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348 views

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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1answer
229 views

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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1answer
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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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1answer
614 views

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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1answer
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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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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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1answer
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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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4answers
11k views

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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3answers
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Why would a stretch variant need a larger horizontal stabilizer?

Update and accept reason The reason for asking why would as opposed to why does is I was not aware of any previous [jetliner] stretch requiring a larger horizontal stabilizer. For example, all the DC-...
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2answers
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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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1answer
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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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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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1answer
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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 (headwind) and SFO-SIN 17 hours (tail wind), 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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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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1answer
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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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1answer
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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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1answer
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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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1answer
981 views

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 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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1answer
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Does the Boeing B787 have safety issues with its battery and windshield?

AVHerald has reported An incident of battery overheating. That is after the aircraft has been grounded and parts of the battery system redesigned. AVHerald provides a detailed report on the battery ...
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1answer
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How do tyre pressure sensors in aircraft work?

I am specifically interested in the sensors used on B777 and B787.
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3answers
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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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1answer
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How many layers do the Boeing 787 cabin windows have and what might make them fail? [duplicate]

I am interested to know how the Boeing 787 cabin windows are made. Specifically, how many layers do they have and what can make them crack in-flight?
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1answer
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Boeing 787 type rating [closed]

How tough/easy is to crack a 787 type rating course? Is a wide body aircraft difficult to fly especially when you are transitioning from 737? Any tips/suggestions would be much appreciated.
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What's the benefit of this long flight (apart from marketing)?

The post Do promotional flight routes have a historical precedent? asks about previous occurrences. I'm guessing this flight (shown below) was a test flight, as well as being a marketing attempt. ...
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Do promotional flight routes have a historical precedent?

Right now, a Dreamliner is flying a rather strange path over the USA (see below). The plane took off from Boeing Field airport near Seattle, and is 'drawing' a virtual copy of itself on the map of the ...
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How are special flight paths coordinated with ATC?

I assume they have to enter a flightplan for this or do say just say "it's a test, please clear airspace for us around the complete US"? Still flying and completing the right wing. I would ...
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2answers
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What is the technical name of the electric window dimming system?

I have recently flown from Mexico City (MMMX) to Tokyo, Japan (RJAA) in a Boeing 787 of All Nipon Airways (ANA). The plane had an electric system for dimming the windows. Does the window-dimming ...
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1answer
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How is structural damage to a composite fuselage detected?

When a service vehicle collides with the aircraft, the plastic nature could hide any subsurface fractures which could propagate as the aircraft goes through cycles. How is potential damage diagnosed ...
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1answer
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Why do flaperons 'move down then up' on takeoff roll on a 787?

The flaperons on the 787 go through certain motions once the TO/GA is pressed. I've always seen it when the 787 is viewed from behind on takeoff. The motions are completely symmetrical, i.e., not ...
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1answer
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Why hasn't Boeing updated the 747 with technology from the 787?

Why hasn't Boeing updated the 747 with technology/designs from the 787 Dreamliner? Surely this would be a very successful aircraft as it could have the best of both designs. Has Boeing explained why? ...
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For a B787 in cruise, what is the altitude, speed, and angle of attack?

For a Boeing 787 in cruise, what's the altitude, speed, and angle of attack? I need the reference as well (normal flight cruise)
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How do virtual circuit breakers work?

In AW189, B787 and few other aircraft/helicopter, the physical breaker has been replaced by virtual breaker, which can be controlled by the MFD (Multi-Function Display). I tried to google the answer, ...
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1answer
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Which type of chevrons is applied on the B787?

Which type of chevron nozzle was applied on the B787? I'm really confused about whether if it's sawtooth or sine wave.
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1answer
1k views

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 ...
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1answer
3k views

Where are the circuit breakers on the 787?

(787 left, 777 right) Normally found aft of the overhead panel, where are they on the Boeing 787?
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1answer
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Why can't Norwegian's Boeing 787 operate from Vegas during hot weather?

In a German news article it was stated that the additional weight (Norwegian puts 291 passengers on their 787-8) leads to operations restrictions in Las Vegas when temperature conditions exceed 40°C. ...