Cessna 172P - Page 62

SECTION
4
NORMAL
PR,OCEDUF,ES
CESSNA
MODEL
17ZP
maximum
RPM.
NOTE
Carburetor
heat should
not be used
during takeoff unless it
is
absolutely
necessary
for obtaining
smobth engine accel-
eration.
Full-throttle
runups
over loose
gravel
are especiatly harmful to
propeller
tips.
When takeoffs must
be made
over
a
gra,vel
surface,
it is very
important
that the throttle
be advanced
slowly. This
allows
the
airplane
to
start
rolling
before
high
F,PM is developed,
and the
gravel
will be blown
back
of the
propeller
rather
than
pulled
into it.
When unavoidable
small
dents
appear
in
the
propelterbtades,
they
should be
immediately
corrected
as
described
in
Section
8 under
Propeller
Care.
Prior
to takeoff
from
fiolds a,bove 3000 feet
elevation, the
mixture
should
be leaned
to
give
maximum
F,PM in
a
full-throttle, static runup.
After
fuII throttle is
applied, adjust the throttle
friction lock
clockwise
to
prevent
the throttle from
creeping back from a maximum
power
position.
Similar friction lock
adjustments should be made
as required in
other flight
conditions to maintain a fixed
throttle setting.
WING
FLAP
SETTINGS
Normal
takeoffs a,re
accomplished with
wing
flaps 0o
-
10o, Using
l0o
wing
flaps
reduces the
ground
roll
and
total
distance over
an obstacle
by
approximately
10
percent.
Flap deflections
greater
than 10o are
not
approved
for takeoff. If 10o wing flaps
are used
for
takeoff,
they should
be
left
down
until all obstacles are cleared
and a, safe flap retraction
speed
of
60
KIAS
is reached.
On a
short field,
10o wing flaps and an obsteclo
clearance
speed
of 56 KIAS should
be used.
Soft or rough field takeoffs are
performed
with
10o flaps
by Iifting
the
airplane offthe
ground
as soon
as
practical
in a slightly
tail-low attitude.
If
no obstacles are
ahead, the
airplane
should be leveled
off immediately
to
accelerate to a
higher
climb
speed.
When
departing
a
soft
field with
an aft
C.G.
loading, the elevator trim should be
adjusted towards
the nose
down
direction to
give
comfortable control
wheel forces duringthe
initial
climb.
4-14
30 May
1980