Questions tagged [boeing]

A United States-based multinational corporation that designs, manufactures and sells fixed-wing aircraft, rotorcraft, rockets and satellites.

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For The 737 where are these "abort start" conditions mentioned?

Can someone tell me where are these abort start conditions (hot start, wet start, and hung start) mentioned? It's not in the AFM, fcom or FCTM so where is it mentioned?
Deepak's user avatar
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1 vote
2 answers
172 views

Do the 787 Flight Spoilers have variable deployment when using the Speedbrake?

On the Boeing 787 (other Boeing models welcome too) while in-flight and/or on the ground do the SpeedBrakes/Spoilers have a variable amount of deployment (in angle) between the "ARMED" and &...
Greg R.'s user avatar
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4 votes
2 answers
708 views

What are the standard numbers for fuel consumption (kg), kg/NM, and kg/h, of Boeing 737-300?

I'm currently working on a school project regarding the analysis of Boeing 737-300 fuel consumption. I'm working on some parameters that my supervisor gave me, which are : Total fuel consumption (kg),...
Luthfi Ahmad's user avatar
1 vote
1 answer
110 views

P-8A Poseidon Airfoil type

Could someone help me find out what airfoil type is used on the P-8A Poseidon symmetrical, conventional, thin or supercritical airfoil? It seems to be, that the Boeing 737-800, like many commercial ...
Catuchka6's user avatar
0 votes
0 answers
75 views

Where to find the official specification of Boeing 737-300 fuel consumption rate and such?

I've been doing some work regarding the analysis of boeing 737-300 fuel consumption in commercial flights, and how all of them fare with the fuel consumption standards, like fuel consumption rate at ...
Luthfi Ahmad's user avatar
-1 votes
1 answer
149 views

On the B737 When A and B systems are pretty much each other's back up for most things Why not for flaps? [closed]

Why have a seperate system for flaps? Which is alternate flaps
Deepak's user avatar
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8 votes
5 answers
3k views

Has Boeing ever tried to compete with the A380, especially now that the B747 is retired in many companies, such as Qantas?

Has there ever been a competitor that is a four-engine plane from Boeing that rivals the A380?
JBHIFI08's user avatar
4 votes
1 answer
2k views

Boeing 737 takeoff config question

On the Boeing 737, what's the difference between taking off in LEVEL CHANGE or no vertical mode selected (i.e. both LEVEL CHANGE and VNAV button blank on MCP). I realize in both the MCP speed window ...
dashman's user avatar
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1 answer
910 views

What does this switch on Boeing Sky overhead bins do? Why is it always set before taxi?

The pivoting overhead luggage bins in the Boeing Sky interior have a tiny switch/lever on one side. In my experience, cabin crew always flips this switch on every single bin (as indicated by the arrow ...
TooTea's user avatar
  • 277
4 votes
1 answer
364 views

Why did only Boeing choose to use 4-engines on the B-17?

The USAAC announced a competition in 1934 for a new multi-engined bomber with the requirement that it carry ~2000 lbs of bombs 2000+ miles at 200+ mph (with 250 mph preferred). The three entrants to ...
interested22's user avatar
4 votes
0 answers
623 views

Why are there two different throttle designs for the 757 and 767?

There is this one, which seems to be the older version. Notice there is a big gap between each lever, except at the top. And this one. Notice there is almost no gap between each lever, making it ...
Charles Nicholson's user avatar
3 votes
0 answers
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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 ...
interested22's user avatar
1 vote
0 answers
69 views

How have aerodynamicists improved transonic wing performance over time?

The following two graphs depict improvements in transonic wing technology that have occurred over the past 20-25 years. Both are sourced from Boeing Commercial Aircraft. In essence, both note that ...
interested22's user avatar
7 votes
1 answer
1k views

Why do the ailerons on an A320 droop when the engines are shut off and the 787 ailerons dont droop when the engines are shut off?

I have been wondering why the ailerons on the A320 (and other Airbus aircraft) droop when there is no power from the hydraulic pump. From my understanding of hydraulic actuators, the position where it ...
John's user avatar
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15 votes
2 answers
9k views

Why did Boeing never replace the 757?

https://boeing.mediaroom.com/2005-04-28-Boeing-Closes-Chapter-in-Aviation-History-with-Final-757-Delivery Boeing in late 2003 decided to end 757 production because the increased capabilities of the ...
chx's user avatar
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0 votes
1 answer
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Interpreting a graph depicting airfoil technology improvement

I found this image in a paper titled, "Design and validation of advanced transonic wings using CFD and very high Reynolds number wind tunnel testing" that was published in part by Mark I. ...
interested22's user avatar
4 votes
2 answers
666 views

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 ...
interested22's user avatar
8 votes
1 answer
835 views

Can air traffic control see control panel selections (I.e. FCU on A320 or MCP on B737)?

I have flown with a few captains that have told me that air traffic control can see the settings we set on the FCU (or MCP on B737): Is this actually correct? I'm aware that ATC can see what speed, ...
user38116's user avatar
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4 votes
3 answers
642 views

Comparisons between the A340 and 747-200 wing: sweep angle and span

Here is a picture of the wings of the A340 (launched in the late 1980s) and the Boeing 747-200/400 (launched in the early 1970s / 80s) superimposed upon each other (source: https://www.amazon.com/...
interested22's user avatar
0 votes
2 answers
2k views

What’s the horizontal and vertical tail airfoil and volume of 747-400? [closed]

What’s the horizontal tail volume coefficient of 747-400? What’s the vertical tail volume coefficient of 747-400? What’s the horizontal tail airfoil of 747-400? What’s the vertical tail airfoil of 747-...
MeACat's user avatar
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1 vote
3 answers
316 views

How has Computational Fluid Dynamics improved commercial airliner wing design?

Starting the 1980s, extremely powerful computational fluid dynamics software has been used to design wing sections and whole wings. I am going to focus on the Boeing 777 as an example of CFD applied ...
interested22's user avatar
10 votes
2 answers
3k views

How have engineers managed to increase commercial airliner wing aspect ratios over time?

Over time, the wing aspect ratios of commercial airliners have increased. For evidence ,see the following data: 1980s: Boeing 747-400: 7.91, Boeing 757-200: 8.0 Boeing 767-300: 8.0 Airbus A310: 8.8 ...
interested22's user avatar
4 votes
1 answer
384 views

How did the 767/757 reduce fuel burn relative to older aircraft (like the 727)?

When Boeing launched the 757 and 767 aircraft, they widely touted it's improved fuel efficiency relative to previous airliners. Notably: Delta stated that the 767 was "quieter and 30 percent ...
interested22's user avatar
2 votes
0 answers
119 views

Could anyone provide me with the performance charts for Boeing KC-135R Stratotanker?

I am looking for the Long Range Cruise Maximum Operating Altitude performance against the weight of the plane, all engines operating. Would be grateful if someone could point me the way.
TheNeedToRefuel's user avatar
1 vote
0 answers
333 views

Do the B777x and similar aircraft use ring laser gyros or solid state MEMS gyros?

In new generation aircraft like B777x , B787 or A350 use the IRS system which is present is it based on (Ring Laser or Fibre Optics) gyros or they used Solid state MEMS like which our present in our ...
Sourabh Jain's user avatar
-1 votes
1 answer
422 views

Why didn't ejection seats become a thing in civil avation and only limited to military? [duplicate]

Recently, an Indian CDS Bipin Rawat and his family as well as eleven members of the Indian Army died in an helicopter crash. You can find the story here. I did look at any questions asked on the topic ...
shirish's user avatar
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5 votes
1 answer
528 views

Does aircraft manufacturers provide option to exchange older models?

Most of the vehicle manufacturers provide exchange value for older models when buying a newer one. Like you can exchange your old BMW 3 Series for new 3 Series or upgrade to 5 Series and so on. Is ...
Gokul Nath KP's user avatar
13 votes
1 answer
1k views

What is that little black thing tied to the vertical stabilizer? [duplicate]

I have seen this on all Boeing test planes, does this provide information on the planes performance?
Boeing787's user avatar
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1 answer
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Why doesn't Boeing use supercritical airfoils?

It's my first question & I really want to know the answer from professionals to decide if my new design of airfoil is worth it because the initial test by CFD software (Fluent-ANSYS) indicate that ...
Miracle Airfoil's user avatar
3 votes
1 answer
865 views

Does Boeing use a similar display to Airbus ECAM to view a particular system?

Airbus has a dedicated ECAM panel forward of the throttles which is used to select a system for display on the LCD. Is there a similar panel used to select a particular system for display on Boeing's ...
Robert Weaver's user avatar
0 votes
0 answers
54 views

Is it possible to continue flying without electric power? [duplicate]

To be specific with the question, I would like to know if if it is possible to continue flying in the event of total loss of electrical power. Obviously, I know this entails the shutting down of ...
Golden's user avatar
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2 votes
0 answers
190 views

How heavy are the folding wingtips of 777x?

To understand the mass penalty that is induced by a folding wingtips, as a first order approximation we can start with just the wingtip's mass without the actuating mechanism. I could not find the ...
karthikeyan's user avatar
6 votes
1 answer
316 views

Why does Boeing 247D have reverse slope windows when they were removed from the D models?

Have a look at this article on a famed example of the 247D, DZ203, the first aircraft to make a completely blind landing. The first image is the aircraft during its flights with the RAF, which places ...
Maury Markowitz's user avatar
1 vote
1 answer
316 views

Does Airbus buy Boeings and vice versa?

I read somewhere that Airbus developed the A350 in response to the B787. In general, how much do Boeing and Airbus know about each other's aircraft? And how do they learn about the detailed designs of ...
Stefan Lafon's user avatar
8 votes
5 answers
2k views

Why did Boeing not create a new 737 instead of just upgrading the old model?

This documentary claims that James McNerney - Boeing's first CEO without a background in aviation, made the decision to upgrade the 737 series to 737 MAX instead of developing a new model. Is this ...
Cloud's user avatar
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1 vote
1 answer
1k views

Is there any difference between Airbus and Boeing on yaw damper technology?

Modern aircraft have yaw damper systems installed. Is there any difference between the two big manufacturers on yaw damper systems, such as the location, etc.? I have to do some research on this topic ...
john's user avatar
  • 11
2 votes
2 answers
2k views

How does one resume a VNAV climb in a B737 NG after being instructed to level off at an altitude below the Cruise altitude?

I am referring to a Boeing 737NG. Assuming I am on a VNAV climb but I am instructed by ATC to climb only to an altitude lower than my FMC Cruise altitude. After leveling off, how do I resume my VNAV ...
Stamatis Vellis's user avatar
0 votes
1 answer
2k views

How does the B777 Side brace locking mechanism work?

The B767 has jury strut actuators and their working is pretty straight forward. They oppose the collapsible geometry of jury strut and lock them in the over centre locking position. But for B777 this ...
Salmonbeing00's user avatar
0 votes
1 answer
1k views

Why is the ISOLATION VAVLE switched to OPEN during ENGINE START on Boeing 737?

As the SOP says in Preflight Procedure – First Officer: "ISOLATION VALVE switch – OPEN" In this way, when engine starts, the ISOLATION VALVE is OPEN not AUTO. The PACK valve is switched to ...
cwcauc's user avatar
  • 111
2 votes
1 answer
22k views

What does "running torque" mean?

I would like to know the meaning of the phrase and especially the meaning of "running torque": Torque the inner plug to between 75 and 85lbf.in. Loosen half a turn and RETORQUE to between 15 and ...
sherline lin's user avatar
1 vote
1 answer
629 views

How do Airbus and Boeing aircraft handle Dutch roll?

I have some homework about Dutch roll filters. Dutch roll is something that is corrected by yaw damper systems, but I would like to know the different ways Boeing and Airbus deal with the issue of ...
Mert Mutlu's user avatar
18 votes
1 answer
2k views

Why aren't 757 scimitar winglets flush with the ailerons?

Over my many past flights aboard 757s, I have seen changes being implemented with their design. One of which was notably their refit of scimitar winglets. Although one of their most notable ...
Ja380's user avatar
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2 votes
1 answer
5k views

What is this long Bar/Rod on the Boeing MH-47G? [duplicate]

This MH-47G has a thick, long rod at the bottom left front. What's the purpose of this thing?
bb1950328's user avatar
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0 votes
1 answer
139 views

Why did the 747-8's freighter version make its first flight before the passenger version?

I have read that the 747-8F entered service in October 2011, almost eight months ahead of the passenger version (747-8I). Anyone know why this is? Thanks
AFROBINSON808's user avatar
5 votes
5 answers
1k views

Can a company be both an airplane manufacturer and an airline?

It may be advantageous for a company that manufactures its own aircraft to also be an airline. For example, the airline business would likely have reduced maintenance and parts costs relative to other ...
Gus's user avatar
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1 vote
2 answers
243 views

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 ...
Air Canada 001's user avatar
22 votes
1 answer
16k views

What does "Boeing" mean?

We know about the existence of Boeing planes like the 737, 747, and other planes. But where did the name "Boeing" come from?
JeanExtreme002's user avatar
17 votes
3 answers
6k views

Why didn’t Boeing ramp 737NG production back up in response to the 737 MAX groundings?

The predecessor of the currently-grounded 737 MAX is the 737 Next Generation (737NG), produced from 1997 through 2019. The NG family (comprising the 737-600, -700, -800, and -900) is extremely ...
Vikki's user avatar
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0 answers
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Is it easy for a Boeing 747 pilot to get a second typerating on the 777? [duplicate]

Is this easy and responsible? Since the 747 and 777 have a glass cockpit, you would think this would be easy.
Lars's user avatar
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6 votes
1 answer
1k views

What changes were made to the 777 as a result of British Airways 38?

Regarding the crash of British Airways Flight 38, a 777 inbound to Heathrow, the AAIB final report, section 2.8 states that frozen fuel deprived the engines of fuel pressure resulting in the crash. ...
ryan1618's user avatar
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