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C919- purple splotch on the flaps?

Posted: Tue Nov 03, 2020 12:56 am
by N415XJ
There's a great photo of the C919 on the front page right now:



But looking more closely, I noticed something odd- a splotch of purple/blue on the top of port inboard flap. Does anyone know what this might be? Some sort of leaked fluid, or maybe overspray from painting (although how one would get such a large, messy spot of paint in that particular area is beyond me).

Re: C919- purple splotch on the flaps?

Posted: Tue Nov 03, 2020 3:10 am
by fr8mech
Well, that appears to be Skydrol purple. That’s hydraulic fluid, but it’s that color when it’s new and fresh. But, that’s a very strange presentation for a leak.

Re: C919- purple splotch on the flaps?

Posted: Tue Nov 03, 2020 12:14 pm
by 787SIN
Too dark for skydrol, might be some kind of flow viz paint, like they use on F1 cars during practice session, its a way of seeing real life flow over a surface.

Re: C919- purple splotch on the flaps?

Posted: Tue Nov 03, 2020 4:02 pm
by 889091
APU also still powered up?

Re: C919- purple splotch on the flaps?

Posted: Wed Nov 04, 2020 12:36 am
by Starlionblue
889091 wrote:
APU also still powered up?


Well spotted. It does indeed looks like it is.

Re: C919- purple splotch on the flaps?

Posted: Wed Nov 04, 2020 2:31 am
by Redbellyguppy
Interesting reflection of the hangar lights in the FO side window...

Re: C919- purple splotch on the flaps?

Posted: Wed Nov 04, 2020 5:34 am
by Horstroad
Definitely not hydraulic fluid.
Looks like somebody spilled some purple paint on the flap leading edge, halfheartedly cleaned it up with a rag, and retracted the flaps so nobody would see it before the flight.

Re: C919- purple splotch on the flaps?

Posted: Wed Nov 04, 2020 9:54 am
by Francoflier
Flow visualization paint from a previous test which hid inside the wing and couldn't get washed?

Re: C919- purple splotch on the flaps?

Posted: Wed Nov 04, 2020 1:36 pm
by zeke
Redbellyguppy wrote:
Interesting reflection of the hangar lights in the FO side window...


Are you suggesting the photo is a fake, taken on the ground with the apu running and then photoshopped?

Re: C919- purple splotch on the flaps?

Posted: Thu Nov 05, 2020 1:44 am
by trent768
Redbellyguppy wrote:
Interesting reflection of the hangar lights in the FO side window...

Looks like some kind of device that was taped on the inside to me, maybe go-pro stand or some other instrument/measuring device? Although it kinda looks like runway lights as well...

Re: C919- purple splotch on the flaps?

Posted: Thu Nov 05, 2020 8:51 am
by CrimsonNL
On this picture on another website, it would appear there is indeed something taped on the windows

https://www.planespotters.net/photo/112 ... comac-c919