The A & A E E Technical Guide (Methods of Planning, Reduction and Analysis of Flight Tests) compiled by the Aeroplane and Armament Experimental Establishment back in the 50s was issued to us at ETPS or did I obtain it at Boscombe Down ?
My copy is now taking on the appearance of an antique with pages going brown and edges well thumbed..
Not much in the guide on how best to do it in the air.
Will be surprised if ETPS, USAF TPS, USNTPS, NASA and NTPS don't have Flight Testing Methodology Handbooks.
Will querie the members of the Flight Test Society of Australia for further information on handbooks. Meanwhile others may be able to elaborate further.
Incidently it became necessary for the the RAAF to produce a Standard Tropical Atmosphere considering the extremely low upper air temperatures in the Oz tropics. Minus 90 C is not uncommon. Other world extreme cold upper air is close to the NW coast of South America.