SECTION 5 CESSNA
PERFORMANCE MODEL 172S NAV III
GFC 700 AFCS
U.S.
SAMPLE PROBLEM (Continued)
FUEL REQUIRED (Continued)
With an expected 10 knot head wind, the ground speed for cruise is
predicted to be:
Therefore, the time required for the cruise portion of the trip is:
The fuel required for cruise is:
A 45-minute reserve requires:
The total estimated fuel required is as follows:
Once the flight is underway, ground speed checks will provide a more
accurate basis for estimating the time enroute and the corresponding
fuel required to complete the trip with ample reserve.
(Continued Next Page)
117 Knots
-10 Knots
107 Knots
342 Nautical Miles = 3.2 Hours
107 Knots
3.2 hours X 8.9 gallons/hour = 28.5 Gallons
45
X 8.9 gallons/hour = 6.7 Gallons
60
Engine start, taxi, and takeoff 1.4 Gallons
Climb 2.6 Gallons
Cruise 28.5 Gallons
Reserve 6.7 Gallons
Total fuel required 39.2 Gallons
172SPHBUS-00
5-8
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