I may be off the mark (?) ....but I always thought the 100% value was related to the original design criterea limitation ...which then obviously changed with equipment/engineering upgrades but due to certification (STC) difficulties OR just being able relate the upgrade changes back to earlier model aircraft... this then allowed for the 102 or 107% type indications...... with the Bell 412EP for instance Cat A rig (if used) allows for 103% Nr/N2 for takeoff ... would this not also allow for Nr droop margin in an OEI situ on takeoff without having to 'Beep' the bejusus out of the sucker ??? ...dont know 'bout the S76.
