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CESSNA
SECTION 7
MODEL 152
AIRPLANE & SYSTEMS
DESCRIPTIONS
ATTITUDE INDICATOR
An attitude indicator is available and gives a visual indication of flight attitude. Bank attitude is
presented by a pointer at the top of the indicator relative to the bank scale which has index
marks at 101, 201, 30', 601, and 901 either side of the center mark. Pitch and roll attitudes are
presented by a miniature airplane in relation to the horizon bar. A knob at the bottom of the
instrument is provided for in-flight adjustment of the miniature airplane to the horizon bar for a
more accurate flight attitude indication.
DIRECTIONAL INDICATOR
A directional indicator is available and displays airplane heading on a compass card in relation
to a fixed simulated airplane image and index. The directional indicator will precess slightly
over a period of time. Therefore, the compass card should be set in accordance with the
magnetic compass just prior to takeoff, and occasionally re-adjusted on extended flights. A
knob on the lower left edge of the instrument is used to adjust the compass card to correct for
any precession.
SUCTION GAGE
A suction gage is located on the left side of the instrument panel when the airplane is equipped
with a vacuum system. Suction available for operation of the attitude indicator and directional
indicator is shown by this gage, which is calibrated in inches of mercury. The desired suction
range is 4.5 to 5.4 inches of mercury. A suction reading below this range may indicate a
system malfunction or improper adjustment, and in this case, the indicators should not be
considered reliable.
STALL WARNING SYSTEM
The airplane is equipped with a pneumatic-type stall warning system consisting of an inlet in
the leading edge of the left wing, an air-operated horn near the upper left corner of the
windshield, and associated plumbing. As the airplane approaches a stall, the low pressure on
the upper surface of the wings moves forward around the leading edge of the wings. This low
pressure creates a differential pressure in the stall warning system which draws air through the
warning horn, resulting in an audible warning at 5 to 10 knots above stall in all flight conditions.
The stall warning system should be checked during the preflight inspection by placing a clean
handkerchief over the vent opening and applying suction. A sound from the warning horn will
confirm that the system is operative.
1 July 1978
7-31
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