In the 1100 NM flight calculation, what is the temperature used?

• A. -60 deg C
• B. -65 deg C
• C. -64.3 deg C
• D. -58 deg C

Answer: (C)

In this 1100 NM flight calculation, the temperature used is a fixed reference value rather than the actual forecast OAT. The method relies on a standard, conservative temperature to simplify and standardize how true airspeed and fuel burn are estimated for a leg. That fixed value is -64.3 deg C, which is the temperature specified for this calculation method. Using a constant temperature keeps the estimate consistent across legs and avoids optimistic results that could come from assuming warmer or variable conditions. The other temperatures don’t fit this particular calculation because the exercise defines -64.3 deg C as the standard reference for the 1100 NM method.