Sorry to dig up an older thread, but I am having difficulty trying to find the formula for this conversion... if anyone has RCJI issue 51, it is supposed to be in there, and can you post it?

I am trying to convert the following to ISA values:

Thrust of 163 N (16.6 kg), temperature of 25 C, altitude of 316 M above sea level, pressure of 101.72 kPa, relative humidity of 43%

Thanks,
Andrew