Cessna 172P Pilot's Operating Handbook And Flight Manual 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