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Partially Polished Nacelle On KLM MD-11  
User currently offlineCrimsonNL From Netherlands, joined Dec 2007, 1845 posts, RR: 42
Posted (1 year 1 month 1 week 16 hours ago) and read 4003 times:
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Hi guys,

One of KLM's last 6 MD-11's, PH-KCD, has been flying around with an interesting pattern on the nacelle of engine #2. You can recognize her beacause of thise from a distance without seeing the registration. The nacelle has several "stripes" of metal which look to be polished, whatever it is it's much brighter then the metal around it. Can anyone tell me what the purpose of this is? I've never seen it before on any other MD-11, or any airliner that I can remember.


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Photo © Aaron Willis
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Photo © Gilbert Hechema



Thanks and regards,

Martijn


Fly DC-Jets!
14 replies: All unread, jump to last
 
User currently offlinen901wa From United States of America, joined Oct 2009, 453 posts, RR: 0
Reply 1, posted (1 year 1 month 1 week 15 hours ago) and read 3978 times:

It's been a long time since I been inside/outside a MD-11 nbr 2 intake, and even longer in a GE powered one. But it looks like the stripes line up with the round access panels that were on the outside of the intake. Maybe a repair of some sort? Not sure, but some info that might help you. Sorry, I am not of more help.

User currently offlineSpaceshipDC10 From Canada, joined Jan 2013, 1639 posts, RR: 3
Reply 2, posted (1 year 1 month 1 week 10 hours ago) and read 3823 times:

Can it be some kind of aluminum tape or looking like used to mark specific points for some sort of airflow test ? The idea of tape came from the time Swiss began operations with Swissair titled aircraft where the 'air' part was covered.


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User currently offlinejagflyer From Canada, joined Aug 2004, 3496 posts, RR: 4
Reply 3, posted (1 year 1 month 1 week 6 hours ago) and read 3732 times:

My first thought is that some sort of repair was carried out which involved riveting new sections or doubler/tripler panels over an area that sustained damage. Due to the symetrical nature of the nacelle's shiny areas, I'm not sure if this is an accident repair or perhaps something to do with where specific mounting screws are.


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User currently offlinehorstroad From Germany, joined Apr 2010, 244 posts, RR: 0
Reply 4, posted (1 year 1 month 6 days 23 hours ago) and read 3593 times:

Quoting SpaceshipDC10 (Reply 2):
Can it be some kind of aluminum tape

I would not tape anything on the engine nose cowl, especially not metal tape. the adhesive will fail sooner or later... engine A/I probably won't delay that.

looks like some kind of repair.


User currently offlineklemmi85 From Germany, joined Mar 2009, 210 posts, RR: 0
Reply 5, posted (1 year 1 month 6 days 16 hours ago) and read 3465 times:

You can see it even better here:

http://www.airliners.net/photo/KLM--...d=3a1ebbd859cf0712ad8151cc9f204eab


User currently offline747classic From Netherlands, joined Aug 2009, 2085 posts, RR: 14
Reply 6, posted (1 year 1 month 6 days 16 hours ago) and read 3458 times:

Quoting SpaceshipDC10 (Reply 2):
Can it be some kind of aluminum tape or looking like used to mark specific points for some sort of airflow test ?

Highly unlikely that tests are performed, seen the very limited time that the last active MD11 aircraft will remain in the KLM fleet. (phase out will be completed in 1-2 years)

Probably a repaired or modified nose cowl was installed.
The repaired patches (exactly located above the stringers?) or doubler plates are probably new or have been polished.
After a few months airline service the polished plates will also be blackened (oxidised) like the surrounding nose cowl structure and the repairs will hardly be noticed anymore.



Operating a twin over the ocean, you're always one engine failure from a total emergency.
User currently offlineCrimsonNL From Netherlands, joined Dec 2007, 1845 posts, RR: 42
Reply 7, posted (1 year 1 month 6 days 15 hours ago) and read 3448 times:
AIRLINERS.NET CREW
CHAT OPERATOR

Quoting 747classic (Reply 6):
After a few months airline service the polished plates will also be blackened (oxidised) like the surrounding nose cowl structure and the repairs will hardly be noticed anymore


I've been browsing through the data base and pictures of KCD with these "stripes" go back as far as late 2011! I found 2 more excellent shots including a nice close-up.



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Photo © Stefan Sonnenberg
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Photo © Jason Wood



Martijn



Fly DC-Jets!
User currently offlineSpaceshipDC10 From Canada, joined Jan 2013, 1639 posts, RR: 3
Reply 8, posted (1 year 1 month 6 days 8 hours ago) and read 3331 times:

It would have surprised me too if the tape suggestion I did was right. On the close-up picture it's really visible that it's something more substantial than just tape.


KEEP LOOKING UP as in Space Fan News
User currently offlineflyingturtle From Switzerland, joined Oct 2011, 2320 posts, RR: 13
Reply 9, posted (1 year 1 month 6 days 8 hours ago) and read 3314 times:

I've seen a (perhaps) similar thing on the 320 engine.



On the engine pylon, you see a brighter part and at the sides, one that has a much darker grey. The brighter one has a rough surface, while the grey one seems to be smooth.

Why is that?



David



Keeping calm is terrorism against those who want to live in fear.
User currently offlineCALTECH From Poland, joined May 2007, 2191 posts, RR: 25
Reply 10, posted (1 year 1 month 6 days 7 hours ago) and read 3295 times:

Quoting flyingturtle (Reply 9):
Why is that?

Color difference between Aluminum and titanium.

As far as the KLM Florence Nightengale MD-11, looks like a repair or reinforcement of the inlet. KLM would know.

Video below.

http://www.youtube.com/watch?v=5PaZy...NbQg&feature=player_embedded#at=70

http://www.youtube.com/watch?v=jAfQw...bYMM&feature=player_embedded#at=67

[Edited 2013-06-21 16:19:52]


UNITED We Stand
User currently offlineflyingturtle From Switzerland, joined Oct 2011, 2320 posts, RR: 13
Reply 11, posted (1 year 1 month 5 days 13 hours ago) and read 3111 times:

Quoting CALTECH (Reply 10):
Color difference between Aluminum and titanium.

Thank you! (But now I'm super-officially stupid, because I own a titanium cooking pot for camping. It has the very same color.)


David



Keeping calm is terrorism against those who want to live in fear.
User currently offlineAA737-823 From United States of America, joined Mar 2000, 5725 posts, RR: 11
Reply 12, posted (1 year 1 month 4 days 8 hours ago) and read 2844 times:

Quoting flyingturtle (Reply 11):
Thank you! (But now I'm super-officially stupid, because I own a titanium cooking pot for camping. It has the very same color.)

The alloys in your "titanium" cooking pot are most likely different alloys than those used on the A320 pylon.
Parts of the Airbus pylons get hot, and so titanium is used here, as I understand it. Conversely, Boeing typically employs cool pylons (except 757s and 747s with RB211 engines, which have precoolers in the pylons as well). You'll notice that a 747 with Rolls Royce engines doesn't have any "Boeing gray" paint on the pylons.

Anyhow, I suspect your cooking pot maybe have different coloration than the pylon due to different chemical makeups of the "titanium" alloys.


User currently offlinebikerthai From United States of America, joined Apr 2010, 2067 posts, RR: 4
Reply 13, posted (1 year 1 month 2 days 13 hours ago) and read 2526 times:

Quoting AA737-823 (Reply 12):
The alloys in your "titanium" cooking pot are most likely different alloys than those used on the A320 pylon.

Typically the aircraft titanium alloy used is Ti 6AL-4V. There are some newer grade titanium that may be used with supper plastic forming. For cookware, I think pure titanium may be used as it is easier to form.

Titanium typically do not have any finish as the surface is already corrosion resistant/proof. Aluminum, specially skin aluminum will have a layer of pure aluminum cladding on the surface that will make it shinier.

I think you can anodize titanium to give it a permanent shine (I heard that some customized titanium bicycle frames are anodized for this purpose). Otherwise a regular titanium surface will readily attract fingerprints.

bt



Intelligent seeks knowledge. Enlightened seeks wisdom.
User currently offlineCALTECH From Poland, joined May 2007, 2191 posts, RR: 25
Reply 14, posted (1 year 3 weeks 5 days 16 hours ago) and read 2173 times:

Quoting CrimsonNL (Thread starter):
The nacelle has several "stripes" of metal which look to be polished, whatever it is it's much brighter then the metal around it. Can anyone tell me what the purpose of this is? I've never seen it before on any other MD-11, or any airliner that I can remember.

Some photos of a 757 nacelle and slat with polishing and repairs in place.

http://i297.photobucket.com/albums/mm233/CALTECHphoto/010_zps6446dba1.jpg

http://i297.photobucket.com/albums/mm233/CALTECHphoto/011_zps20c5f2c1.jpg

http://i297.photobucket.com/albums/mm233/CALTECHphoto/013_zps2a05ffa4.jpg



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