Cessna 402C Pilot Operating Handbook page 103

SECTION 5
PERFORMANCE
DEMONSTRATED OPERATING TEMPERATURE
Satisfactory engine cooling has been demonstrated for this airplane with
an outside air temperature 230C (41 0 F) above standard. This is not to be
considered as an operating limitation. Reference should be made to Section
2 for engine operating limitations.
INTRODUCTION TO TABULATED PERFORMANCE
The performance tables are presented in increments of temperature, alti-
tude and any other variables involved. Performance for a given set of
conditions can be approximated as follows:
r=--........
(1 )
(2)
Takeoff, Accelerate Stop, Accelerate Go, Landing - Enter tables at
the next higher increment of weight, altitude and temperature.
Cruise - Enter tables at next lower increment of temperature and
altitude.
To obtain exact performance values from the tables, it is necessary to
interpolate between the increment values. The following is an example of
approximation and interpolation, using an excerpt from the Normal Takeoff
Distance Chart.
EXAMPLE
Given:
Weight
Temperature
Pressure Altitude
Headwind
6200 Pounds
(l6 0 C) 610F
2400 Feet
19 Knots
Find:
Takeoff Speed
Ground Roll
Total Distance
to Clear 50-
Foot Obstacle
K1AS
Feet
Feet
IOoC (50°F)
20°C (68°F)
Total Total
Takeoff
Distance Distance
and CI imb
Pressure Ground to Clear Ground to Clear
Weight Speed Altitude
Roll - 50-Ft -
Roll - 50-Ft
-
Pounds KIAS
Feet Feet Feet
Feet Feet
6500 92 2000
1680 2070 1840 2280
3000 1790 2190 2000 2450
6000 89 2000
1400 1720 1530 1890
3000 1480 1820 1620 2000
Approximation Method
Extract from the chart the next increment of weight, altitude and tem-
perature which is more conservative than the actual conditions [i.e.: 6500
pounds, 3000 feet and 200C (68°F)].
Takeoff and Climb Speed.
Ground Roll. . . . . .
Total Distance to Clear 50-Foot Obstacle
92 K1AS
2000 Feet
2450 Feet