Cessna 152 1978, Pilot Operating Handbook, Page: 110 / 192

CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 7-14
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 O-235-L2C and is rated at 110
horsepower at 2550 RPM. Major engine accessories (mounted on the front of the engine) include a
starter, a belt-driven alternator, and an oil cooler. Dual magnetos are mounted on an accessory drive
pad on the rear of the engine. Provisions are also made for a vacuum pump and full flow oil filter.
ENGINE CONTROLS
Engine power is controlled by a throttle located on the lower center portion of the instrument panel.
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.
ENGINE INSTRUMENTS
Engine operation is monitored by the following instruments: oil pressure gage, oil temperature gage,
and a tachometer.
The oil pressure gage, located on the subpanel, is operated by oil pressure. A direct pressure oil line
from the engine delivers oil at engine operating pressure to the oil pressure gage. Gage markings
indicate that minimum idling pressure is 25 PSI (red line), the normal operating range is 60 to 90 PSI
(green arc), and maximum pressure is 100 PSI (red line).