from the HOGE charts EC135 at 5000 ft isa +10 ( 25 deg c) MGW= 6250 lbs Md902 = 6250
at isa +20 (35 deg c ) ec135 = 6250lbs md902 6200 lbs.
PW207 in Explorer 206B2 in Ec135.
If I am reading the charts right there is not much between the 2 , what is criteria for CAT A performance is it OEI ?.
Ec135 has lower empty weight but carries more fuel.
it is not clear in either doc what the empty weight of the helicopter includes , is any mission equipment included or is this bare bones weight ( excluding radios, autopilot seat cushions etc ). Can any of you guys give actual weights of your equipped aircraft ( including Flir , searchlight etc). You could then compare performance between two equally equipped helicopters.