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convair880mfan
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Posts: 213
Joined: Fri Jun 25, 2021 12:33 am

Bump on Boeing 737-200 engine

Sat Jul 10, 2021 4:32 pm

There is a little teardrop shaped bump in the aft portion of the Boeing 737-200 engine forward of the thrust reversers. It is on top of the engine casing and can be seen when sitting inside of a 737-200 engine and looking out the window. Does anyone know what it is for.

It looks like an access panel for something there atop the engine casing. ??? Thanks so much for any answers or guesses?
 
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Starlionblue
Posts: 20798
Joined: Fri Feb 27, 2004 9:54 pm

Re: Bump on Boeing 737-200 engine

Sun Jul 11, 2021 1:33 am

A picture would really help. :)
 
adipasqu
Posts: 208
Joined: Wed Apr 21, 2004 1:37 pm

Re: Bump on Boeing 737-200 engine

Sun Jul 11, 2021 2:32 am

convair880mfan wrote:
There is a little teardrop shaped bump in the aft portion of the Boeing 737-200 engine forward of the thrust reversers. It is on top of the engine casing and can be seen when sitting inside of a 737-200 engine and looking out the window. Does anyone know what it is for.

It looks like an access panel for something there atop the engine casing. ??? Thanks so much for any answers or guesses?


Are you referencing this:





or this:

 
convair880mfan
Topic Author
Posts: 213
Joined: Fri Jun 25, 2021 12:33 am

Re: Bump on Boeing 737-200 engine

Sun Jul 11, 2021 3:24 am

I am referencing the bump seen in the bottom photo you so kindly furnished. It is in the shiny metal seen on the place where engine and upper wing meet. The rest of the wing in the photo appears to be covered in corogard I think. Sorry if I have misspelled that coating name. The other photos you posted are related to the target-type thrust reversers. I am wondering about the teardrop shaped bump seen in the lower photo. Thanks to one and all for any information.
 
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CALTECH
Posts: 3532
Joined: Thu May 17, 2007 4:21 am

Re: Bump on Boeing 737-200 engine

Sun Jul 11, 2021 3:26 am

convair880mfan wrote:
There is a little teardrop shaped bump in the aft portion of the Boeing 737-200 engine forward of the thrust reversers. It is on top of the engine casing and can be seen when sitting inside of a 737-200 engine and looking out the window. Does anyone know what it is for.

It looks like an access panel for something there atop the engine casing. ??? Thanks so much for any answers or guesses?


Guesses ? You mean the fairing on top of the Jurassic pylon ?

Image

Classics had them too...

Image

NexGens the pylon didn't stick out behind the wing, so no pylon no fairing on top of aft pylon.....

Image
 
Max Q
Posts: 9066
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Re: Bump on Boeing 737-200 engine

Sun Jul 11, 2021 3:37 am

And what is it’s purpose ?!
 
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DL_Mech
Posts: 2710
Joined: Fri Feb 18, 2000 7:48 am

Re: Bump on Boeing 737-200 engine

Sun Jul 11, 2021 3:52 am

Area ruling?

Sorry, I couldn’t resist.
 
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DL_Mech
Posts: 2710
Joined: Fri Feb 18, 2000 7:48 am

Re: Bump on Boeing 737-200 engine

Sun Jul 11, 2021 5:23 am

I looked in my 737-200 training manual, and it only showed the flap screw jack that drives the outboard side of the inboard flap inside that pylon.

It looks like the original 737-100 with the short thrust reversers might have it as well (hard to tell).

http://static.thisdayinaviation.com/wp-content/uploads/tdia//2012/04/Boeing-737-130-PA-099-N737001.jpg

http://737-100.tumblr.com/image/92554893928

EDIT: You can see it here (in green zinc chromate) Flap carriage?:

http://www.gettyimages.com/detail/news-photo/german-technicians-from-lufthansa-tecnik-dismantle-the-news-photo/846539478?adppopup=true
 
DH106
Posts: 667
Joined: Wed Jun 15, 2005 5:32 pm

Re: Bump on Boeing 737-200 engine

Sun Jul 11, 2021 9:18 am

Almost certainly covering part of the flap carriage which probably protrudes slightly at some flap angle.
 
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HAWK21M
Posts: 30175
Joined: Fri Jan 05, 2001 10:05 pm

Re: Bump on Boeing 737-200 engine

Mon Jul 12, 2021 11:50 am

Spacing clearence for accomodating the flap carriage nut

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