Specifications

CESSNA SECTION 5
MODEL 172R NAV III PERFORMANCE
GFC 700 AFCS
U.S.
SAMPLE PROBLEM (Continued)
TAKEOFF
The takeoff distance chart, Figure 5-5, should be consulted, keeping in
mind that distances shown are based on the short field technique.
Conservative distances can be established by reading the chart at the
next higher value of weight, altitude and temperature. For example, in
this particular sample problem, the takeoff distance information
presented for a weight of 2450 pounds, pressure altitude of 2000 feet
and a temperature of 30°C should be used and results in the following:
These distances are well within the available takeoff field length.
However, a correction for the effect of wind may be made based on
information presented in the note section of the takeoff chart. The
correction for a 12 knot head wind is:
This results in the following distances, corrected for wind:
(Continued Next Page)
Ground roll
1275 Feet
Total distance to clear a 50-foot obstacle 2290 Feet
12 Knots
X 10% = 13% Decrease
9 Knots
Ground roll, zero wind 1275 Feet
Decrease in ground roll (1275 feet X 13%) -166 Feet
Corrected ground roll 1109 Feet
Total distance to clear a 50-foot obstacle, zero wind 2290 Feet
Decrease in total distance (2290 feet X 13%) -298 Feet
Corrected total distance to clear 50-foot obstacle 1992 Feet
172RPHBUS-00 5-5