Takeoff - Cessna 172R Pilot Operating Handbook

SECTION 5
CESSNA
PERFORMANCE
MODEL 172R
CRUISE CONDITIONS:
Total distance
320 Nautical Miles
Pressure altitude
5500 Feet
Temperature
20°C
Expected wind enroute
10 Knot Headwind
LANDING CONDITIONS:
Field pressure altitude
2000 Feet
Temperature
25°C
Field length
3000 Feet
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:
Ground roll
1275 Feet
Total distance to clear a 50-foot obstacle 2290 Feet
These distances are well within the available takeoff field length.
However, a correction for the effect of wind may be made based on
Note 3 of the takeoff chart. The correction for a 12 knot headwind is:
12 Knots X 10% = 13% Decrease
9 Knots
This results in the following distances, corrected for wind:
Ground roll, zero wind
1275
Decrease in ground roll
-166
(1275 feet X 13%)
Corrected ground roll
1109 Feet
5-4
Dec 2/96