747400sp
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What Part Of An 777 Is 757/767 Related?

Sat May 08, 2010 5:03 am

The T-7 looks like it could be a sibling to the Boeing twin 757/767, but I know it a different a/c, but I have reed that a 777 wings is similar to the 757/767 wings, and I know It has the same section 41 as a 767. So what parts of the 777 is related to the 757/767?
 
BMI727
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RE: What Part Of An 777 Is 757/767 Related?

Sat May 08, 2010 6:43 am

Quoting 747400sp (Thread starter):
So what parts of the 777 is related to the 757/767?

As far as I know, section 41 is the only major section shared with the 767, but not the 757. I would guess that there are at least some minor bits (fasteners, wires, etc) that are shared, and of course a good deal of the knowledge from previous projects made it to the 777 as well.
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RE: What Part Of An 777 Is 757/767 Related?

Sat May 08, 2010 9:15 am

Quoting 747400sp (Thread starter):
reed

It's spelled "read", please learn that.

Quoting 747400sp (Thread starter):
So what parts of the 777 is related to the 757/767?

They all have wings, engines and a tail, does that count?
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boeing767mech
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RE: What Part Of An 777 Is 757/767 Related?

Sat May 08, 2010 10:09 am

Quoting 747400sp (Thread starter):
. So what parts of the 777 is related to the 757/767?

The brake pressure gauge is the same on the 757/767/777 just differnet locations in the cockpit.
The radome from a 767 can be fitted on a 777.

Quoting 747400sp (Thread starter):
but I have reed that a 777 wings is similar to the 757/767 wings

The wings from a 757 are not the same on a 777. The 757 doesn't have inboard ailerons like the 767/777. They also have differnet flaps and spoilers.

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TZTriStar500
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RE: What Part Of An 777 Is 757/767 Related?

Sat May 08, 2010 2:58 pm

Quoting 747400sp (Thread starter):
I know It has the same section 41 as a 767
Quoting BMI727 (Reply 1):
section 41 is the only major section shared with the 767

This is not entirely true. The entire Section 41 is not the same, only the flight deck cab section.
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MD11Engineer
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RE: What Part Of An 777 Is 757/767 Related?

Sat May 08, 2010 4:48 pm

Even the 757 and the 767 only have superficial similarity (the cockpits look similar and the indication systems and flight control input levers look the same), but at system level they are quite different and only share some avionics boxes.

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AirframeAS
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RE: What Part Of An 777 Is 757/767 Related?

Sat May 08, 2010 7:27 pm

Quoting 747400sp (Thread starter):
but I have reed that a 777 wings is similar to the 757/767 wings

I think you read that incorrectly. The 777 wing is extremely HUGE and has a beautiful wingflex than a 757/757 wing does.
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OldAeroGuy
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RE: What Part Of An 777 Is 757/767 Related?

Sat May 08, 2010 11:01 pm

Here are few similarties:

777 and 767 hydraulic system arrangements (but not all the parts) are nearly identical.

777 and 757 have an autoslat, the 767 does not.

777 airfoil sections are more closely related to the 757 than the 767.
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c5load
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RE: What Part Of An 777 Is 757/767 Related?

Wed May 12, 2010 11:39 pm

Quoting OldAeroGuy (Reply 7):
Here are few similarties:

777 and 767 hydraulic system arrangements (but not all the parts) are nearly identical.

777 and 757 have an autoslat, the 767 does not.

777 airfoil sections are more closely related to the 757 than the 767.

So, can pilots who fly the 767 also be able to inter-fly with the 777?
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FX772LRF
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RE: What Part Of An 777 Is 757/767 Related?

Wed May 12, 2010 11:50 pm

Quoting c5load (Reply 8):
So, can pilots who fly the 767 also be able to inter-fly with the 777?

No, the type ratings would be different since the 767 is a predominately analog cockpit, while the 777 is a complete glass cockpit setup.

On the same note, the 757 and 767 do share a type rating because of their similarities in cockpit configuration, both being analog and having nearly identical configurations.

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KELPkid
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RE: What Part Of An 777 Is 757/767 Related?

Thu May 13, 2010 12:25 am

Quoting FX772LRF (Reply 9):
No, the type ratings would be different since the 767 is a predominately analog cockpit, while the 777 is a complete glass cockpit setup.

I'd love to know how you are claiming that one of the first civil aircraft to feature a glass cocpkit (the 767) is "a predominately analog cockpit"   It does have a few more analog backup instruments than the T7, though...


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Although it has an analog mach meter/airspeed indicator and altimeter, the PFD is probably the primary for normal flight. Note, too, that the combined HSI/Radio Magnetic Indicator is actually a CRT display.

The Engine instruments are all digital in the 767, too, and it has an electronic flight management system.

So no, all in all, not "predominately analog."
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FX772LRF
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RE: What Part Of An 777 Is 757/767 Related?

Thu May 13, 2010 2:18 am

Quoting KELPkid (Reply 10):
So no, all in all, not "predominately analog."

In comparison to the 777 cockpit, I think most people would go "Oh hey, that's got a lot more analog instruments than the 777." if they'd looked into a 767 cockpit.

I think I didn't really get my point across. I meant to touch more on the fact that the 777 is a complete (minus some backup instruments) glass cockpit. All of your normal instruments, indicators, maps, checklists (not sure if this is used by itself or in addition to the paper checklists), and other cockpit instruments are included into the screens on the 777. The 767 doesn't have that. The two cockpits aren't necessarily worlds apart, they're more like countries apart, but they still are two separate type ratings. Which is all that c5load wanted to know.

Thank you KELPkid for the correction.

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Dalmd88
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RE: What Part Of An 777 Is 757/767 Related?

Thu May 13, 2010 3:21 am

The 777 and the 767-400 have very similar cockpit configs. If an operator wanted to they could spend the money and make the 767-300 digital cockpit look like the 777 digital cockpit. The big change is from CRT to LCD screens. Even with simlar cockpit setups they would still be different type ratings. The -400 requires a differences class from the -300 type.

From an avionics standpoint the 777 has a larger databus system. I think it is twice as big as the 767. It was also the first Boeing to use fiber optic wiring in some systems. I've heard they moved away from fiber optic with the 787. It is just too hard to repair in the field.

On the airframe I think the only other common is the cabin windows were also used on the 767-400. My guess is the fuel tank plates are the same as used on the 767. Other than that I doubt there are many true major common parts.
 
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RE: What Part Of An 777 Is 757/767 Related?

Thu May 13, 2010 4:33 pm

Quoting DALMD88 (Reply 12):
It was also the first Boeing to use fiber optic wiring in some systems. I've heard they moved away from fiber optic with the 787. It is just too hard to repair in the field.

I'm not a 100% sure about this but later model 777's have the fiber optics deleted. Like you said, to hard to fix in the field.
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