Attitude Indicator; Directional Indicator; Suction Gage; Stall Warning System - Cessna 1980 182Q Pilot's Operating Handbook And Flight Manual

SECTION 7
AIRPLANE
&
SYSTEMS DESCRIPTIONS
CESSNA
MODEL 182Q
necessary to operate the attitude indicator and directional indicator. The
system consists of a vacuum pump mounted on the engine, a vacuum relief
valve and vacuum system air filter on the aft side of the firewall below the
instrument panel, anq. instruments (including a suction gage) on the left
side of the instrument panel. .
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 10°,20° ,30° ,60°, and 90°
either side of the center mark. Pitch and roll attitudes are presented by a
miniature airplane superimposed over a symbolic horizon area divided
into two sections by a white horizon bar. The upper "blue sky" area and the
lower "ground" area have arbitrary pitch reference lines useful for pitch
attitude control. A knob at the bottom of the instrument is provided for
inflight adjustment of the miniature airplane to the horizon bar for a more
accurate flight attitude indication.
DIRECTIONAL INDICATOR
A directional indicator 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
The suction gage, located on the left side of the instrument panel above
the avionics power switch, is calibrated in inches of mercury and indicates
suction available for operation of the attitude and directional indicators.
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 adjust-
ment, and in this case, the indicators should not be considered reliable.
STALL WARNING SYSTEM
The airplane is equipped with a vane-type stall warning unit, in the
leading edge of the left wing. which is electrically connected to a stall
warning horn under the map compartment. A 5-amp push-to-reset circuit
breaker labeled STALL WARX. on the left side of the switch and control
7-36
1 October 1979