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What Part Of An 777 Is 757/767 Related?  
User currently offline747400sp From United States of America, joined Aug 2003, 3757 posts, RR: 2
Posted (4 years 7 months 2 weeks 1 day 3 hours ago) and read 6920 times:

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?

13 replies: All unread, jump to last
 
User currently onlineBMI727 From United States of America, joined Feb 2009, 15828 posts, RR: 27
Reply 1, posted (4 years 7 months 2 weeks 1 day 2 hours ago) and read 6884 times:

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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User currently offlineunattendedbag From United States of America, joined Oct 2003, 2342 posts, RR: 1
Reply 2, posted (4 years 7 months 2 weeks 23 hours ago) and read 6848 times:

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?



Slower traffic, keep right
User currently offlineboeing767mech From United States of America, joined Dec 2000, 1031 posts, RR: 3
Reply 3, posted (4 years 7 months 2 weeks 22 hours ago) and read 6819 times:

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.

David



Never under-estimate the predictably of stupidty
User currently offlineTZTriStar500 From United States of America, joined Jan 2004, 1459 posts, RR: 9
Reply 4, posted (4 years 7 months 2 weeks 18 hours ago) and read 6693 times:

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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User currently offlineMD11Engineer From Germany, joined Oct 2003, 14137 posts, RR: 62
Reply 5, posted (4 years 7 months 2 weeks 16 hours ago) and read 6636 times:

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.

Jan


User currently offlineAirframeAS From United States of America, joined Feb 2004, 14150 posts, RR: 24
Reply 6, posted (4 years 7 months 2 weeks 13 hours ago) and read 6528 times:

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.



A Safe Flight Begins With Quality Maintenance On The Ground.
User currently offlineOldAeroGuy From United States of America, joined Dec 2004, 3592 posts, RR: 66
Reply 7, posted (4 years 7 months 2 weeks 9 hours ago) and read 6445 times:

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.



Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
User currently offlinec5load From United States of America, joined Sep 2008, 917 posts, RR: 0
Reply 8, posted (4 years 7 months 1 week 3 days 9 hours ago) and read 5900 times:

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?



"But this airplane has 4 engines, it's an entirely different kind of flying! Altogether"
User currently offlineFX772LRF From United States of America, joined Apr 2009, 675 posts, RR: 12
Reply 9, posted (4 years 7 months 1 week 3 days 9 hours ago) and read 5892 times:

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.

-Noah   



Cleared to IAH via CLL 076 radial/BAZBL/RIICE3, up to 3k, 7k in 10, departure on 134.3, squawk 4676, Colgan 9581.
User currently offlineKELPkid From United States of America, joined Nov 2005, 6428 posts, RR: 3
Reply 10, posted (4 years 7 months 1 week 3 days 8 hours ago) and read 5874 times:

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."



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineFX772LRF From United States of America, joined Apr 2009, 675 posts, RR: 12
Reply 11, posted (4 years 7 months 1 week 3 days 6 hours ago) and read 5848 times:

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.

-Noah   



Cleared to IAH via CLL 076 radial/BAZBL/RIICE3, up to 3k, 7k in 10, departure on 134.3, squawk 4676, Colgan 9581.
User currently offlineDALMD88 From United States of America, joined Jul 2000, 2612 posts, RR: 14
Reply 12, posted (4 years 7 months 1 week 3 days 5 hours ago) and read 5834 times:

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.


User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 13, posted (4 years 7 months 1 week 2 days 16 hours ago) and read 5644 times:

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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