ALL SIX TYPES OF MCDONNELL DOUGLAS HELICOPTER COMPANY'S 300 AND 500 SERIES HELICOPTER MAIN ROTOR (M/R) BLADES HAVE METAL ABRASION STRIPS ON THEIR LEADING EDGES TO PROVIDE ADDITIONAL WEAR PROTECTION. THESE ABRASION STRIPS ARE SECONDARILY BONDED TO THE M/R BLADE'S LEADING EDGE, WITHIN STRICT BOND-LINE THICKNESS TOLERANCES. THIS OPERATION MUST BE DONE WITH A BONDING TOOL THAT CAN PROVIDE PROPER HEAT TRANSFER AND PRESSURE CONDITIONS THAT PRODUCE AN EXCELLENT METAL-TO-METAL BOND BETWEEN DISSIMILAR METALS. FURTHERMORE, ON SOME M/R BLADES, THE TOOLING USED TO BOND THESE ABRASION STRIPS CANNOT APPLY TOO MUCH PRESSURE AFT OF THE LEADING EDGE SPAR DUE TO THE MINIMAL STRUCTURAL SUPPORT IN THIS SECTION OF THE M/R BLADE.