jpmagero
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Joined: Fri Apr 13, 2012 9:06 pm

An Explanation For These Engine Differences?

Mon Sep 10, 2012 1:21 am

Hi - I'm curious - is there anything special about the differences in these engines, besides the visual difference? I apologize, I don't know the technical terms for that part.

John M - Aussie expat in the US
 
N243NW
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RE: An Explanation For These Engine Differences?

Mon Sep 10, 2012 2:03 am

Nope. The part I'm sure you're referring to is the spinner on the center of the fan. I'm not an engine expert, but different airlines have been known to use different designs for the spinner for various reasons. Many engines don't have anything painted on the spinner, as you can see from the above aircraft. Perhaps the two engines on this A330 were sourced from different overhaul facilities or airlines.
B-52s don't take off. They scare the ground away.
 
my235
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RE: An Explanation For These Engine Differences?

Mon Sep 10, 2012 2:03 am

One spinner is painted and the other is not?
 
MarkC
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RE: An Explanation For These Engine Differences?

Mon Sep 10, 2012 3:12 am

Even if the engines were sourced from different overhaulers, its the operator who provides the paint pattern, and it would be the same. I have overhauled spinner cones.

My two guesses:

One is a leased engine.

One is a new part that was replaced after a bird strike or something, and they did not have time to paint it.
 
jpmagero
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RE: An Explanation For These Engine Differences?

Mon Sep 10, 2012 2:49 pm

Quoting my235 (Reply 2):
One spinner is painted and the other is not?

Wow...that's it... 

Yes, I guess I didn't state the obvious, except to say the "visual difference" thinking it was obvious.
John M - Aussie expat in the US
 
BoeingGuy
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RE: An Explanation For These Engine Differences?

Mon Sep 10, 2012 3:58 pm

On the 777, at least, the painted spinner is an optional feature. I'm guessing it's the same for the A330. So as others indicated, for whatever reason, this airplane ended up with one engine with the optional paint and the other without.
 
MarkC
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RE: An Explanation For These Engine Differences?

Mon Sep 10, 2012 11:29 pm

FYI, there is no such thing as an unpainted spinner. They all have several coats of Laminar X-500 or equivalent paint. Some maybe pure white, and may seem unpainted. The actual color of the unpainted kevlar layers in the PW4000's is yellow. Not sure of other engines as I have not personally worked on them.

Mark
 
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Stitch
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RE: An Explanation For These Engine Differences?

Tue Sep 11, 2012 1:39 am

Could the spinner on the starboard engine just not be visible because it's in shadow?
 
my235
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RE: An Explanation For These Engine Differences?

Tue Sep 11, 2012 9:16 am

I like the spinners on most Lufthansa's 747's. It's all white with a black center circle with a black swoosh out of it like this:
Lufthansa 747 spinner
 
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HAWK21M
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RE: An Explanation For These Engine Differences?

Tue Sep 11, 2012 11:09 am

Quoting MarkC (Reply 3):
One is a new part that was replaced after a bird strike or something, and they did not have time to paint it.

Something similiar out hereon one Aircraft.....The Spinner was put on .... put the marking/paint was added on at a much later date timepermitting....
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jpmagero
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RE: An Explanation For These Engine Differences?

Sun Sep 16, 2012 10:08 pm

Quoting Stitch (Reply 7):
Could the spinner on the starboard engine just not be visible because it's in shadow?

no, there was no shadow, I got this at several angles in direct sunlight.
John M - Aussie expat in the US
 
AA737-823
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RE: An Explanation For These Engine Differences?

Wed Sep 19, 2012 8:35 am

I change a lot of spinner cones.... sigh.
What most likely happened here is that they borrowed one from another carrier, or as someone stated above, one engine is leased.
I believe Swiss PW4000's used the white spinners... But LX was not alone in that.

The other one isn't unpainted, it's simply black.

Now, paint is NOT a requirement; when the paint falls off (which it invariably does), you can keep the spinner flying without it. You simply have to do a visual check for corrosion. But, that said, they all have paint when new or overhauled.

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