Cessna 152 1978, Pilot Operating Handbook

Page: 62 / 192

CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 5-4
TAKEOFF
The takeoff distance chart, figure 5-4, should be consulted, keeping in mind that the distances shown
are based on the short field technique. Conservative distances can be established by reading the chart
at the next higher value of altitude and temperature. For example, in this particular sample problem,
the takeoff distance information presented for a pressure altitude of 2000 feet and a temperature of
30°C should be used and results in the following:
Ground roll 980 Feet
Total distance to clear a 50-foot obstacle 1820 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 𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾
9 𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾
× 10% = 13% 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷
This results in the following distances, corrected for wind:
Ground roll, zero wind 980
Decrease in ground roll (980 feet
×
13%) 127
Corrected ground roll 853 Feet
Total distance to clear a 50-foot obstacle, zero wind: 1820
Decrease in total distance (1820 feet
×
13%) 237
Corrected total distance to clear 50-foot obstacle 1583 Feet
CRUISE
The cruising altitude should be selected based on a consideration of trip length, winds aloft, and the
airplane’s performance. A typical cruising altitude and the expected wind enroute have been given for
this sample problem. However, the power setting selection for cruise must be determined based on
several considerations. These include the cruise performance characteristics presented in figure 5-7, the
range profile chart presented in figure 5-8, and the endurance profile chart presented in figure 5-9.
The relationship between power and range is illustrated by the range profile chart. Considerable fuel
savings and longer range result when lower power settings are used.
The range profile chart indicates that use of 65% power at 5500 feet yields a predicted range of 375
nautical miles under no wind conditions. The endurance profile chart, figure 5-9, shows a corresponding
3.9 hours.