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      radioguy


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      Post #53574, posted on 06-05-2014 GMT-5 hours    
      An overhead shot of an Air China T7-3 at the url below. Of note, the wings on just about every one I've seen have no corrogard, while the majority of the -200 series have it. The ice detection strip is there, though. Don't recall seeing those on the -200. Which leads to my question. Does anyone on the forum know why this is so?


      http://cdn-www.airliners.net/aviation-photos/middle/0/2/0/2451020.jpg

      Alan Aronoff
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      Ken Miller


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      Post #53575, posted on 06-05-2014 GMT-5 hours    
      Alan,
      Don't have a specific answer to your question but........

      I noted that the United 777-200 I flew on quite a few years back did not have corogard on the upper wings. Here's a link to a newer paint one that also doesn't have corogard. Good luck :-)


      http://www.airliners.net/photo/United-Airlines/Boeing-777-222-ER/2431145/&sid=fab094d27bfe886f8876abdd146436b3


      Ken

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      XRadar


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      Post #53576, posted on 06-05-2014 GMT-5 hours    
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      radioguy : The ice detection strip is there, though.



      Just a note for everyone:

      That is actually an alignment stripe for the main gear for the pilots to use on take-off/landing/taxiing. There is a camera in the tail for this. It might double as an ice detection strip but probably not.

      Keep em separated!
      Steve

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      radioguy


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      Post #53578, posted on 06-06-2014 GMT-5 hours    
      Another mystery, Ken. As I stated in the original, the majority of the -200 have corrogard. Your UA shot is one of the minority a/c in the series. Good example.

      Quote
      Ken Miller :
      Alan,
      Don't have a specific answer to your question but........

      I noted that the United 777-200 I flew on quite a few years back did not have corogard on the upper wings. Here's a link to a newer paint one that also doesn't have corogard. Good luck :-)


      http://www.airliners.net/photo/United-Airlines/Boeing-777-222-ER/2431145/&sid=fab094d27bfe886f8876abdd146436b3


      Ken


      Alan Aronoff
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      Post #53623, posted on 06-10-2014 GMT-5 hours    
      United has never had Corroguard on the *upper* surface of their 777s. At least on the first ones delivered in the 1990s, they *did* have it on the lower wing surface. I had the Boeing paint shop diagrams for it when I did my decals in 1996.

      Corroguard is a customer option, so you really need to consult photos of a specific airline/aircraft to determine conclusively whether it's there.

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      Post #53894, posted on 06-30-2014 GMT-5 hours    
      Seems the 'rule of thumb' where 777-300 (and -200) wings are concerned is that airframes built after the first 737NGs were delivered (c. 1998-'99) more or less invariably have (like all 737NGs) overall Boeing 707 light gray wings top and bottom. Which is to say that all 777-300ERs and most if not all non-ER -300s have overall 707 Gray wings top and bottom.

      Some 777s delivered pre-1998-'99 have Corogard inspar panels bottom and/or top -- oddly, unlike (and opposite to) any other Boeing jetliner type, some early-build 777s have Corogard panels on lower wing surfaces only with overall gray upper.

      As always, photo references 'rule'...nonetheless it would seem entirely safe to assume that a 777-300ER will have wings entirely sans Corogard...while non-ER -300s call for more thorough research. I would be altogether confident to wager that no one can produce an unedited photo showing a 777-300ER with Corogard on upper or lower wings.

      Todd
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      Post #53895, posted on 07-01-2014 GMT-5 hours    
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      Tango-Bravo :


      As always, photo references 'rule'...nonetheless it would seem entirely safe to assume that a 777-300ER will have wings entirely sans Corogard...while non-ER -300s call for more thorough research. I would be altogether confident to wager that no one can produce an unedited photo showing a 777-300ER with Corogard on upper or lower wings.

      Todd
      IWA/PHX



      You would lose that wager, at least some of AC's 773ER have Corogard on the underside though I have never noticed any with it on top

      Edit and ANA has some with it top and bottom
      http://www.airliners.net/photo/All-Nippon-Airways/Boeing-777-381-ER/2413723/L/&sid=33ca161c1a066d72429c679579d6c247

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      Post #53902, posted on 07-01-2014 GMT-5 hours    
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      slate :
      You would lose that wager, at least some of AC's 773ER have Corogard on the underside though I have never noticed any with it on top



      Guess the saying about military aircraft color schemes "for every rule there is an exception" also applies to airliners...even (to my surprise) to 777-300ERs. Interestingly, the upper wing inspar areas of the ANA 777-381ER in the photo linked appear to be more medium/dark gray paint than having the subtle metallic appearance associated with traditional Corogard.

      As for my statement concerning upper and lower wings of all 737NGs delivered (without exception) being sans-Corogard... I will wager a set of 737-800 Corgogard decals (from the Revell KLM kit), postage paid, to the first person who can provide an unedited photo of a 737-600/700/800/900 with Corogard inspar panels.

      Todd
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      radioguy


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      Post #53906, posted on 07-02-2014 GMT-5 hours    
      Here ya go....



      Interesting that you mention the KLM kit. The corogard in that one is light grey. No metallic appearance at all.

      Alan Aronoff
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      Post #53908, posted on 07-02-2014 GMT-5 hours    
      Here ya go again.....

      Al

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      Post #53945, posted on 07-04-2014 GMT-5 hours    
      Corroguard is still available on any Boeing product except the 787, and remains a customer option. A current Boeing employee who deals with customers confirmed that to me last week. The newer generation of paints aren't subject to the nasty effects of Skydroand other fluids, so the Corroguard isn't as necessary as it used to be.

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      Post #53946, posted on 07-04-2014 GMT-5 hours    
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      radioguy :
      Interesting that you mention the KLM kit. The corogard in that one is light grey. No metallic appearance at all.



      I wouldn't necessarily trust a Revell decal as a reference source.