Jim,
Thanks for the detailed reply.
You give the impression (from your comments) that in spite of the fact that you claim to be operating to PC1, you are not adjusting the masses for drop-down. Is that a correct assumption?
We are adjusting RTOW/RLW for drop down ht, as advocated by the RFM CatA supplement.
Drop down ht 90Ft or more, std WAT graph for Cat A Part A (elevated helipads) applies :- which gives say 30degC, SL, Nil winds - RTOW 11,000lbs. (Increases with head wind component).
If drop down less than 90ft, the reduction in RTOW is calc from dedicated graph for different drop down hts (less than 90Ft) which results in a even lesser RTOW.
A second question (I have a faint idea about the ans but not sure if it is correct)
Why do we beep up the Nr to 103% before takeoff / landing in CatA profiles?
As I understand, we are on the wrong side of the L/D ratio, so inc in Nr actually increases the Drag (therefore torque / power reqmt) more than the Lift. So what is the benefit? Is it just more reserve of Nr in case of an OEI?
HB