Cessna Skyhawk 172N Pilot Operating Handbook page 122

SECTION 7
CESSNA
AIRPLANE
&
SYSTEMS DESCRIPTIONS MODEL 172N
CONTROL LOCKS
A control lock is provided to lock the ailerons and elevator control
surfaces in a neutral position and 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 BEFORE 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 on the instrument panel and insert the rod into
the aligned holes. 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-cooled, carbureted engine with a wet sump oil system.
The engine is a Lycoming Model 0-320-H2AD and is rated at 160 horsepow­
er at 2700 RPM. Major accessories include a starter and belt-driven
alternator mounted on the front of the engine, and dual magnetos and a
vacuum pump which are mounted on an accessory drive pad on the rear of
the engine. Provisions are also made for a full flow oil filter.
ENGINE CONTROLS
Engine power is controlled by a throttle located on the switch 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 full 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 full aft is the idle cut-off position. For small adjustments, the
control may be moved forward by rotating the knob clockwise, and aft by
rotating the knob counterclockwise. For rapid or large adjustments, the
knob may be moved forward or aft by depressing the lock button in the end
of the control, and then positioning the control as desired.
7-16
1 July 1978