CESSNA SECTION 5
MODEL 172S NAV III PERFORMANCE
GFC 700 AFCS
U.S.
SAMPLE PROBLEM (Continued)
FUEL REQUIRED
The total fuel requirement for the flight may be estimated using the
performance information in Figure 5-7 and Figure 5-8. For this sample
problem, the time, fuel and distance to climb may be determined from
Figure 5-7 for normal climb. The difference between the values shown
in the table for 2000 feet and 8000 feet results in the following:
These values are for a standard temperature and are sufficiently
accurate for most flight planning purposes. However, a further
correction for the effect of temperature may be made as noted on the
climb chart. The approximate effect of a nonstandard temperature is to
increase the time, fuel and distance by 10% for each 10°C above
standard temperature, due to the lower rate of climb. In this case,
assuming a temperature 16°C above standard the correction would be:
With this factor included, the fuel estimate would be calculated as
follows:
Using a similar procedure for the distance to climb results in 18 nautical
miles.
The resultant cruise distance is:
(Continued Next Page)
Time: 11 Minutes
Fuel: 2.2 Gallons
Distance: 15 Nautical Miles
16°C
X 10% = 16% Increase
10°C
Fuel to climb, standard temperature 2.2 Gallons
Increase due to non-standard temperature (2.2 X 16%) 0.4 Gallons
Corrected fuel to climb 2.6 Gallons
Total distance 360 Nautical Miles
Climb distance -18 Nautical Miles
Cruise distance 342 Nautical Miles
172SPHBUS-00
5-7
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