T-45A UJPT & E2-C2 INAV08
Fuel, Weather, and Alternate Airfield Planning
DETERMINING FUEL REQUIREMENTS FOR ROUTE OF FLIGHT 126.96.36.199
To determine the fuel requirements for each stage of flight, apply OPNAVINST 3710.7 minimum fuel
criteria. These criteria ensure that you will have sufficient usable fuel (and a margin for safety) to execute
your flight plan. The following excerpt from OPNAVINST 3710.7, paragraph 4.6.4, fully states the
minimum fuel requirements for naval aircraft.
MINIMUM FUEL REQUIREMENTS
FUEL PLANNING. All aircraft shall carry sufficient usable fuel, considering all meteorological
factors and mission requirements, to ensure:
(1) If alternate is not required, fly from takeoff to destination airfield plus a reserve of ten
(10) percent of planned fuel requirements.
(2) If alternate is required, fly from takeoff to the approach fix serving destination and thence to an
alternate airfield plus a reserve of ten (10) percent planned fuel requirements.
(3) In no case shall the planned fuel reserve after final landing at destination or alternate airfield, if
one is required, be less than that needed for 20 minutes flight, computed for turbine-powered,
fixed-wing aircraft based on maximum endurance operation at 10,000 ft.
(4) Minimum fuel reserve requirements are contained in the appropriate NATOPS manual.
T-45 NATOPS Performance Data, Section XI
The NATOPS performance data section provides charts to compute your fuel data. For convenience, this
information is consolidated in the Trawing Two In-Flight Guide.
NAVIGATION COMPUTER 2.1.10
The circular navigation computer has been designed to aid pilots in the solution of problems involving
flight, and primarily to compute time enroute and fuel required for a flight. The Navy uses various makes
and models, primarily the CR-2, 3 or 4 or the APN-91, but whether it be Jeppesen, Telex, Allegheny, or
one of several other makes, they are all either identical or similar in design. You have already been
exposed to this type of computer during the Schools Command and Primary phases of training.
You should be fairly familiar with the calculator side, basically it's a circular slide rule that can be used for
time/distance/fuel computations (see your primary CR-2 workbook for review) but there is one more item
that it can be used for that has not been introduced up to now.