Thanks.
I have another question. On FCOM ref DCS-22-20-40-30 P17 onwords there are values for types of aircraft. There, should we add the calculated Perf factor to the given figure? Eg: as per FCOM A340-212 CFM56-5C3 value is -2.5%. so if we get the calculated Perf Factor as 2.9%. Should we consider the corrected perf factor as 2.5+2.9=5.4%?