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B777 Engine Identification

Posted: Fri Aug 23, 2019 12:38 pm
by jakubz
I'm back at it and looking to visually recognize B777 engines.

I know that the -200LR, -F, and -300ER have the GE90-115 as the only option, so those aircraft are easy enough.
For the -200 and -200ER, GE90, PW4000, and Trent 800 are options
For the -300, the PW4000 and Trent 800 are the options. I'm guessing nobody picked the GE90 for the -300.

Here is my questions. For the models where the GE90, PW4000, and Trent 800 are options, how can I tell each apart?
One potential complication that I've heard/read is that the nacelle is the same, regardless of the engine.

Big thank you for everybody who answered my previous questions regarding B767 and B787 engines, and a big thanks for everybody willing to help me out in this thread.

https://www.airliners.net/forum/viewtopic.php?f=5&t=1407297&p=20862313#p20862313
https://www.airliners.net/forum/viewtopic.php?f=5&t=1413511&p=21029929#p21029929

Re: B777 Engine Identification

Posted: Fri Aug 23, 2019 3:28 pm
by extender
The pylon is the giveaway.

The PW has a short apron(top of the pylon)
The RR has a longer apron (you can tell them apart)
The GE, the pylon rises as you go forward.

Re: B777 Engine Identification

Posted: Fri Aug 23, 2019 3:35 pm
by extender
extender wrote:
The pylon is the giveaway.

Sorry for the selection of the photos.

The PW has a short apron(top of the pylon)


The RR has a longer apron (you can tell them apart)



The GE, the pylon apron rises as you go forward.


Re: B777 Engine Identification

Posted: Sun Aug 25, 2019 6:04 pm
by Tartarus
jakubz wrote:
I know that the -200LR, -F, and -300ER have the GE90-115 as the only option, so those aircraft


The - 200F uses GE90-110's.

Re: B777 Engine Identification

Posted: Sun Aug 25, 2019 6:14 pm
by DL_Mech
Later GE90-100s (77W,77L,77F) have a fan that is positioned further inside the inlet (longer nose cowl?). The earlier GE90s are much shorter from inlet lip to the fan blades.

Re: B777 Engine Identification

Posted: Sun Aug 25, 2019 6:52 pm
by DL_Mech
DL_Mech wrote:



Re: B777 Engine Identification

Posted: Sun Aug 25, 2019 9:19 pm
by jakubz
Tartarus wrote:
jakubz wrote:
I know that the -200LR, -F, and -300ER have the GE90-115 as the only option, so those aircraft


The - 200F uses GE90-110's.


You got me on that detail. I was looking at engine family and counted two version of the GE90 used (123 inch fan blade and 128 inch fan blade).

Based on the TCDS the 777F and the 777-200LR both use either the GE90-110B1 or GE90-115B. It's my understanding that those are physically the same engine and visually indistinguishable.

Re: B777 Engine Identification

Posted: Mon Aug 26, 2019 4:56 pm
by jetlife2
jakubz wrote:
Tartarus wrote:
jakubz wrote:
I know that the -200LR, -F, and -300ER have the GE90-115 as the only option, so those aircraft


The - 200F uses GE90-110's.


You got me on that detail. I was looking at engine family and counted two version of the GE90 used (123 inch fan blade and 128 inch fan blade).

Based on the TCDS the 777F and the 777-200LR both use either the GE90-110B1 or GE90-115B. It's my understanding that those are physically the same engine and visually indistinguishable.


That's correct. The only difference is the rating plug. This is a hardcoded memory chip that controls the engine rating. All the thrust rating tables exist in the software and the plug determines which table is used. So even the part number of the software is unchanged.

Re: B777 Engine Identification

Posted: Tue Aug 27, 2019 8:49 pm
by LH707330
In addition to the above comments:

The T800 has a boxy pylon and the engine is the smallest
The GE90s have a darker ring at the outside of the core duct that's typically got way more contrast than those on the T800 and PW4000
The GE90 is the largest, and hence looks stumpy compared to the PW4000

Just get a set of pictures from the same angle, and then you'll start to see it pretty quickly.

Edit: some good threads in the model forum:

https://airlinercafe.com/forums.php?m=posts&q=9820
https://www.airlinercafe.com/forums.php?m=posts&q=4093
https://www.airlinercafe.com/forums.php?m=posts&q=9403

Re: B777 Engine Identification

Posted: Wed Aug 28, 2019 6:40 pm
by DocLightning
Tartarus wrote:
jakubz wrote:
I know that the -200LR, -F, and -300ER have the GE90-115 as the only option, so those aircraft


The - 200F uses GE90-110's.


As does the -200LR. But the GE90-110 is physical identical and interchangeable with the -115 with the only difference being a software plug. Having 115klbf engines on the shorter -200 body would not provide the tail with enough control authority in a max-thrust engine-out scenario so they are software derated by 5000lbf.