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-   -   RV-7a Nose-Gear Collapse Part 2... (http://www.vansairforce.com/community/showthread.php?t=147709)

boandrv7a 03-16-2017 02:52 PM

RV-7a Nose-Gear Collapse Part 2...
 
For those of you who PM'd me and asked questions, here is an updated video now that the engine has been removed and more damage revealed:

The AV8R's

BTW... The nose-gear bolt WAS sheared and the nose-gear stop flange was installed incorrectly. I don't know if that had anything to do with it, or not, but for those who were wondering...

Thanks!

Jim

snopercod 03-16-2017 04:27 PM

I'm not getting any audio on your videos. Other YouTube videos work.

boandrv7a 03-16-2017 05:24 PM

Quote:

Originally Posted by snopercod (Post 1158429)
I'm not getting any audio on your videos. Other YouTube videos work.

Hmmmmm... I just tried it. Worked fine???

Jim

Brantel 03-16-2017 05:26 PM

Worked for me.

snopercod 03-16-2017 06:08 PM

Still no joy. Something to do with my computer I guess. I'll try to read lips :D

boandrv7a 03-16-2017 07:54 PM

That happens to me sometimes... I find that if I wrap my head in tinfoil, stand on one leg and hold hangers in both hands, it works...

Jim

Pat Stewart 03-17-2017 04:58 AM

No information in this video other than what a nose gears looks like when you land on it or maybe have the aircraft severely crabbed at nose gear touch down. The opportunity to learn is what was experience in the windy conditions, was it a cross wind, what was the wind speed, was there some type of shear and how did the aircraft respond to pilot input in those conditions.

As far as gear failure on its own we have all seen years of this issue and know the gear just does not fail on roll out for no reason. Is the RV nose gear less forgiving than a Cessna 150 when you land on it, absolutely.

Walt 03-17-2017 05:41 AM

http://www.vansaircraft.com/pdf/sb14-12-22.pdf

If I'm not mistaking, SB 14-12-22, which came out over 2 years ago, was the result of an incorrectly installed stop flange which caused the NLG retainer bolt to fail.
This was likely a contributor, or possibly the direct cause of, the failure in this case as well.

From the SB:

"Van’s Aircraft has received reports of damage resulting from the WD-631-PC or WD-1031 Nose Stop Flange (stop flange) having been oriented incorrectly during installation. If the stop flange is installed incorrectly, it will allow insufficient rotation of the nose fork during tight taxi turns and can cause the tire to drag sideways. This induces excessive loads on the stop flange, nose gear leg, engine mount and the associated attach hardware."

Pat Stewart 03-17-2017 05:52 AM

If the bolt was installed wrong you are correct but I would think if true in this case there would be evidence to that end.

Walt 03-17-2017 05:57 AM

Quote:

Originally Posted by Pat Stewart (Post 1158562)
If the bolt was installed wrong you are correct but I would think if true in this case there would be evidence to that end.

The stop flange was incorrectly installed as can be seen in the video and confirmed by the OP, this can cause the upper retainer bolt to shear with the resulting nose gear collapse.


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