Mariner
A friend @ Northrop/Grumman, a Thermal engineer has pointed out the discrepancy that follows. Freezing point of -78, -53, (Average)and -42 Maximum are expressed in degrees Fahrenheit. Quoted OAT (at times) along the noted Flightpath are -78 degrees with Fuel Low Temp of -38 degrees, Centigrade. Should the discussion revolve around values expressed in the same measuring system?
Gas Path, does the Fuel/Oil Heat exchanger also have a bypass, allowing for flow should the Heater Plug Up?
Airfoil