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HeliTorque :: View topic - Robinson Posts Blade Skin Debonding Safety Notice
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HeliTorque Forum Index » Flight Safety

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Robinson Posts Blade Skin Debonding Safety Notice
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WhirlyGirl
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PostPosted: Tue Jan 09, 2007 7:53 pm    Post subject: Robinson Posts Blade Skin Debonding Safety Notice Reply with quote

RHC has received reports of main rotor blade skins beginning to debond (separate) at the skin-to-spar joint on the lower surface near the blade tip of R22 and R44 blades. They are recommending thorough visual inspection... Read the full documentation for more info:

Click here to download the PDF file from Robinson.

WhirlyGirl Cool
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PostPosted: Mon Mar 10, 2008 7:19 pm    Post subject: Reply with quote

Yes, this problem has been showing up more and more. I have enclosed a link where you can get a good idea of the magnitude of the separation that can occur in flight.

Scary, but toys do break. Very Happy

http://www.aero-news.net/index.cfm?ContentBlockID=c6ef8ee3-a2d8-4c5c-9146-8b6f298d656e&
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HeliCraig
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PostPosted: Tue Mar 11, 2008 11:51 am    Post subject: Reply with quote

Am I to understand then that the "tape" solution mentioned has been approved by EASA and thus is acceptable on G registered a/c ? Or have I misread it!
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PostPosted: Tue Mar 11, 2008 5:09 pm    Post subject: Reply with quote

HeliCraig,

That is the way I read it. The EASA spearheaded the approval from what I hear. In the US, everything like repair ADs (airworthiness directives) goes through our Federal Aviation Administration (FAA).

Here is an additional link:

http://www.airwolfaerospace.com/

I will reach out to Jon Quest at Airwolf for a definite answer on G registered aircraft.

No Craig, you cannot use scotch tape to fix it just yet. Very Happy

Will post an update later today.

AB
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PostPosted: Tue Mar 11, 2008 5:15 pm    Post subject: Reply with quote

Faster than a speeding bullet.....

YES, the repair is authorized for G registered aircraft.

Airwolf has received the full EASA approval. They have not scheduled a formal public release until the end of next week, but you hear it live TODAY, HERE ON THE HELITORQUE FORUM!!!

and they said the scotchtape is out.

Glad to be of assistance. Laughing

As always, keep the rotors turning and safe flying.

AB
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PostPosted: Thu Dec 18, 2008 9:55 pm    Post subject: Reply with quote

So has anybody got experience of the Airwolf kits for thr Robbo's? Any improvement seen? It got me thinking about the Robbie blades when I was taxiing out the other morning and you could see the de-icing sand/salt sparking as it hit the blades.

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PostPosted: Fri Dec 19, 2008 6:06 pm    Post subject: Reply with quote

Anyone able to source the tape in UK yet or come to that in USA and ship to UK ?
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PostPosted: Fri Dec 19, 2008 7:42 pm    Post subject: Reply with quote

As far as I am aware the kits are only FAA approved, not sure if EASA approval is in the process.

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PostPosted: Fri Jan 08, 2010 8:57 pm    Post subject: Can tape prevent disbonds? Reply with quote

Hi people

Blakmax here. I have posted extensively on that other forum in relation to adhesive bonding. I have 37 years experience in that technology and I specialise in adhesive bond failure forensics. I have examined failed RHC blades and I observed extensive adhesion failure (a weak form of failure which occurs the interface between the adhesive and the metal) and only limited cohesion failure (fracture of the adhesive layer). Adhesion failures are time dependent and are usually driven by hydration of the chemical bonds at the interface. They are directly dependent on the processes used at manufacture and the rate of failure increases with humidity and temperature. Atmospheric humidity is sufficient to cause the problem. Tapes and paint will only slow down, not prevent moisture diffusion so they do not prevent the problem. Worse yet, the best defence against this problem is visual inspection for lifting of the skin. If you place a tape over the joint, how do you inspect it?

Regards
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