CESSNA
SECTION 5
MODEL 172S NAV III
PERFORMANCE
FUEL REQUIRED (Continued)
With an expected 10 knot headwind, the ground speed for cruise is
predicted to be:
117
-10
107 Knots
Therefore, the time required for the cruise portion of the trip is:
342 Nautical Miles = 3.2 Hours
107 Knots
The fuel required for cruise is:
3.2 hours X 8.9 gallons/hour = 28.5 Gallons
A 45-minute reserve requires:
45
60
X 8.9 gallons / hour = 6.7 Gallons
The total estimated fuel required is as follows:
Engine start, taxi, and takeoff
1.4
Climb
2.6
Cruise
28.5
Reserve
6.7
Total fuel required
39.2 Gallons
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.
172SPHAUS-00
U.S. 5-7