Cessna 172N - Takeoff and Landing Performance

SECTION
5
PERFORMANCE
CESSNA
MODEL
172N
CRUISE
CONDITIONS
Total distance
460
Nautical
Miles
Pressure
altitude
5500 Feet
Temperature 20oC
(16"C
above standard)
Expected
wind
enroute
10
Knot
Headwind
LANDING
CONDITIONS
Field
pressure
altitude
2000
Feet
Temperature
25oC
Field length
3000
Feet
TAKEOFF
The
takeoff
distance chart,
figure 5-4,
should
be consulted,
keeping
in
mind
that the distances
shown
are
based on
the
short
field tech-
nique.
Conservative distances can
be established
by
reading
the chart
at the next
higher value
of
weight, altitude
and
temperature.
For
ex-
ample, in
this
particular
sample
problem,
the
takeoff
distance
informa-
tion
presented
for
a weight
of 2300
pounds,
pressure
altitude
of 2000
feet
and
a temperature
of 30oC should
be used
and results
in
the
following:
Ground roll
1075
Feet
Total
distance
to clear a 50-foot obstacle
1915 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
,
rovo
=LBvo
Decrease
9 Knots
This results
in the following
distances,
corrected
for
wind:
Ground
roll,
zero wind
Decrease
in
ground
roll
(1075
feet
"
lSVo)
Corrected
ground
roll
IO75
140
ffi
tr'eet
Total
distance
to clear a
50-foot obstacle,
zero
wind
1915
Decrease
in total
distance
(1915
feet
*
L3Vo)
249
Corrected total distance
to
clear
a
5O-foot obstacle
1666 Feet
5-4