Cessna Skyhawk 172N Pilot Operating Handbook page 256

Supplement POH
Reims/Cessna (F) 172 N&P
with TAE 125-02-114
GROUND ROLL AND TAKE-OFF
The ground roll and take-off distance chart, Figure 5-1a ff
(Ground Roll and Take-off Distance), 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, temperature
and altitude. For example, in this particular sample problem, the
takeoff distance information presented for a weight of 1043 kg,
pressure altitude of 1000 ft and a temperature of 30°C should
be used and results in the following:
Ground Roll..........................................................263 m (863 ft)
Total Distance to clear a 15 m obstacle.............451 m (1478 ft)
These distances are well within the available takeoff field length.
However, a correction for the effect of wind may be made based
on Note 2 of the takeoff chart. The correction for a 12 Knot
Headwind is:
12 Kt
x 10 % = 13 % (Decrease)
9 Kt
This results in the following distances, corrected for wind:
Ground Roll, zero wind ....................................... 263 m (863 ft)
Decrease at 12 Knot Headwind (263m x 13%)=- 34 m (112 ft)
Corrected Ground Roll ........................................ 229 m (751 ft)
Total Distance to clear a 15 m obstacle,
zero wind.......................................................... 451 m (1478 ft)
Decrease at 12 Knot Headwind (451 m x 13%)= - 58 m (192 ft)
Corrected Total Distance to clear a ................ 393 m (1286 ft)
15 m obstacle
Page 5-2
Issue 2
Revision 7, April 2015