Turbine D
I note your take on the AD amendment to allow an averaging of wear for this powerplant's Splines. I don't fully get your conclusion. If the 5mm wear limit was not superseded, the engines would have been "less available" to the operator. An allowance for averaging seems clearly meant to allow any single Spline with maximum wear to continue on wing, whilst its mates had time to "Catch up". I cannot read this amendment another way. If wear had presented as consistent spline/spline, no change in AD would have been considered?? If not consistent, an average allows the weak link to degrade further??