I did not notice that BMax said it was an every day occurrence? he is suggesting some of the repair methods could leave you with a reocuring problem,I certainly don't understand how injection will be an improvement over origional bond and would sugest that without re finishing Both surfaces to be bonded there is a good chance it will disbond again \ again \again.
Are we saying the people with cracks are not following the makers flight regime?
if they are why the cracks? if they are not := why should the customer do unpaid R&D for manufacturers,

Blakmax,
to answer your question when we get a canopy (off the airframe) in for repair we remove all of the old repairs that Eurocopter was doing with some wacked out resin and glass system that didn't work. We spend a lot of hours sealing the edges of the canopy with resin before we are able to get vacuum on it and inject the resin into the area that is dis-bond is at the upper post section, the repair is not small it extends from the top of the post area all the way to the lower section of the post as it begins to wrap around the lower part where the fwd cowl comes into contact. Eurocopter calls this "reinforcing". We also apply a repair to the inside of the post area. I have seen our repairs after a full season of heavy use, being here in BC they get a lot of use and the repairs are intact with no cracking. I do appreciate your info though what I am interested in is the areas that you are talking about outside of the canopy?

Clarification
 

OK guys, I confused the canopy repairs with structural disbonds originally discussed on this thread. Sorry about that.
I also need to state that my experience (and hence my comments) relate to generic repair of structures, not to any specific aircraft type. I am not implying any ongoing problems with any aircraft type.
What I am saying is that any adhesive bonded structure which relies on peel plies (no, not the canopy) and uses removal of the peel ply as the only surface preparation is highly susceptible to disbonding.

I am also saying that any attempt to repair anything by resin injection is futile.

Scomp, these reinforcements, are they in a plane parallel to the canopy? In other words is there any of the glass applied that bridges the open end of the crack? Perhaps you could send me a PM with a photo.

Blakmax

Yes the reinforcing bridges the crack along the plane of the canopy. I am in total agreement that the use of Peel ply's with no other type of surface prep will eventually lead to more dis-bonding of the plies, and injection repair doesn't get to the root of the problem, and will also lead to more dis-bonding. I will see if I can find some photo's for you.

Scary! we all seem to agree:suspect:

common
 

I know this trend is old but this is a very common problem and no an easy fix! but i can do it!

What method are you using? BB