CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 7-28
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 prcession.
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 4.6 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.
AVIONICS SUPPORT EQUIPMENT
The airplane may, at the owner’s discretion, be equipped with various types of avionics support
equipment such as an audio control panel and static dischargers. The following paragraphs discuss
these items.
AUDIO CONTROL PANEL
Operation of radio equipment is covered in Section 9 of this handbook. When one or more radios is
installed, a transmitter/audio switching system is provided (see figure 7-10). The operation of this
switching system is described in the following paragraphs.
To Next Page
Loading...
