Correct Airfoilmod, the Grumman report does show temps in F. By conversion, the lowest freeze point they identified was -61C. (Interestingly, the highest freeze point they measured would have been off spec for Jet A-1on that parameter!)
Regarding your point about mixed units, both the prescribed test method for freezing points and Defstan Jet specs both specify the measurements to be in degC.
Last edited by Mariner9; 6th June 2008 at 08:10.