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Gentlemen,It has come to my attention that some have misinterpreted the recommendation in this AD to "consider the addition of rivets to provide an additional means of securing the join .....".In the same paragraph, you will note the words "....metal rotor blades that rely on bonding as the sole means of skin adhesion to the main spar ....."The difficulty here is that if you are not completely familiar with the manufacturing process used to construct your blades, you may believe that you must rivet the skins on your rotor blades. This is not necessarily so.For example, Aerodyne blades are bonded, but also utilise a rebate in the spar into which the skins are fitted. As the bonding is not the "sole means of skin adhesion" there is no need to rivet these blades in order to comply with AD 03.2004.If you are unsure, contact the blade manufacturer in the first instance, the ASRA Technical Manager Adrian Stofels or myself for advice and clarifiction.I apologise if this was not made clear enough in the original AD.Regards,Allan WardillOperations Manager
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Waddles
In aviation, the only stupid question is the one you don't ask! -
Some people may not have seen what Allan is talking about.[?]This is an Aerodyne rotor blade section. Wow, this pic posting is exciting again!!
]Aussie Paul. [
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49.4 KBwww.firebirdgyros.comPaul, keep the width of your images to no more than 650 pixels. I have resized these shots for you to fit on the screen.Admin
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Thanks for the picture Paul.When investigating the recent GyroTech bonding failure I found that while I had been told both upper and lower skins were captured by the recess in the leading edge extrusion, this was only true of the lower skin, which is particularly unfortunate as the upper skin has not been preformed, and so instead of wanting to lie contentedly in its place is always wanting to spring out and escape the bonding.John EvansThink logically and do things well, think laterally and do things better.
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If the skin wrap the leading-edge over and both ends meet at the trailing-edge riveted,guess the bonding would be much better?
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