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...and you'll find host of different adhesives used to "glue" myriad components in place: seals, baffles, carpet, Velcro ... the list goes on and on.

When it comes to adhesively bonding a repair to a helicopter rotor blade, you'll find many mechanics become very apprehensive, and rightfully so. The thought process is nearly automatic in an A&P's mind -- if a customer's door seal that you glued on last week comes loose, they'll be annoyed. If the rotor blade repair that you glued on last week comes off in flight, they'll be considerably more than just annoyed.

Rotor blade repairs must be strong and durable and they must be aerodynamically smooth. They must not add excessive weight to the blade, nor can they make the blade overly stiff in one location.

Nowhere in aviation are the stakes higher than when it comes to the quality of your adhesive bond.

Though each manufacturer is different, blade repairs covered in maintenance manuals usually fall into two categories. The first category is the replacement of leading edge components such as nickel, titanium, or sometimes elastomeric erosion strips. The second category involves patching by means of adhesive bonding of the blade skins. This sort of repair might or might not include the blade's core material, and often involves the use...

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