Cessna 172P - Page 140

SECTION
7
AIRPLANE
& SYSTEMS
DESCRIPTIONS
CESSNA
MODEL 172P
window
outw&rd, a,Dd
hold
it
there. An openable
window
is
also available
for
the right
door, and functions in
the
sa,me
maruler
as the
left
window,
If
reguired,
either window
may be opened at any
speed up
to 158 KIAS. The
cabin
top
windows
(if
installed),
rear side windows,
a,nd
rea,r windows are
of the fixed
type and canuot
be opened.
CONTROL
LOCKS
A control lock is
provided
to lock the aileron and elevator control
surfaces
to
prevent
damage to these systems by
wind
buffeting while
the
airplane
is
parked.
The lock consists of a shaped steel rod with a red metal
flag
attached to it. The flag is labeled
CONTROL
LOCK, REMOVE
BEFOIì,E
STARTING
ENGINE. To install the control lock, align
the hole
in the top
of the
pilot's
control
wheel
shaft
with the hole in
the top
of
the
shaft collar
cn
the
instrument
panel
and
insert the rod into the aligned
holes. Installation
of
the lock wiII secure the ailerons in a neutral
position
and the elevators in
a slightly
trailing edge down
position.
Proper
installation of the lock will
place
the red flag over the ignition switch.
In
areas
where high or
gusty
winds occur, a
control
surface
lock
should
be
installed over the vertical
stabilizer
and rudder. The control lock and
any
other type
of
locking
device should
be removed
prior
to starting
the engine.
ENGINE
The airplane
is
powered
by
a
horizontally-opposed,
four-cylinder,
overhead-valve,
air-sooled, carbureted engine with a wet sump
oil
system.
The
engine is a Lycoming
Model O-320-D2J and is rated at 160 horsepower
at 2700
RPM. Major
accesso¡ies include
a starter and belt-driven alternator
mounted
on
the
front
of the engine, and dual magnetos,
a,
va,cuum
pump,
and a full
flow oil filter on
tho
rear
of the engine.
ENGINE
CONTROLS
Engine
power
is
oontrolled by
a throttle
located on the switct¡
and
control
panel
above
the control
pedestal.
The
throttle operates in
a
conventional
manner; in the full forward
position,
the throttle is open,
and
in
the fuII aft
position,
it is closed. A friction lock, which
is a round knurled
disk, is located
at the base of the
throttle
and
is
operated
by
rotating the
lock clockwise to increase friction or counterclockwise to decrease
it.
The mixture
control, mounted above
the right corner of
the control
pedestal,
is a red knob with raised
points
around
the circumference
and
is
equipped with
a
lock
button in the end
of the knob. The
rich
position
is full
forward, and fult aft is the idle cut-off
position.
For small
adjustments,
the
7-16
30
May 1980