Pitot-Static System And Instruments - Cessna 1980 182Q Pilot's Operating Handbook And Flight Manual

CESSNA
MODEL 182Q
SECTION 7
AIRPLANE
&
SYSTEMS DESCRIPTIONS
the cabin manifold to an outlet on top of the anti-glare shield. Defrost air
flow is controlled by a rotary type knob labeled DEFROST.
For cabin ventilation, pull the CABIN AIR knob out, with the CABIN
HEAT knob pushed full in. To raise the air temperature, pull the CABIN
HEAT knob out until the desired temperature is attained. Additional heat
is available by pulling the knob out farther; maximum heat is available
with the CABIN HEAT knob pulled out and the CABIN AIR knob pushed
full in.
Separate adjustable ventilators supply additional ventilation air to
the cabin. One near each upper corner of the windshield supplies air for the
pilot and copilot, and two ventilators are available for the rear cabin area
to supply air to the rear seat passengers. Each rear ventilator outlet can be
adjusted in any desired direction by moving the entire outlet to direct the
airflow up or down, and by moving a tab protruding from the center of the
outlet left or right to obtain left or right airflow. Ventilation airflow may be
closed off completely, or partially closed according to the amount of
airflow desired, by rotating an adjustment wheel adjacent to the outlet.
PITOT-STATIC SYSTEM AND INSTRUMENTS
The pitot-static system supplies ram air pressure to the airspeed
indicator and static pressure to the airspeed indicator, vertical speed
indicator and altimeter. The system is composed of either an unheated or
heated pitot tube mounted on the lower surface of the left wing, two
external static ports on the lower left and right sides of the forward
fuselage, and the associated plumbing necessary to connect the instru-
ments to the sources.
The heated pitot system (if installed) consists of a heating element in
the pitot tube. a rocker switch labeled PITOT HEAT and a 10-amp push-to-
reset circuit breaker on the left side of the switch and control panel, and
assoclated wiring. When the pitot heat switch is turned on, the element in
the pltot tube is heated electrically to maintain proper operation in
posslble icing conditions. Pitot heat shoulq. be used only as required.
A static pressure alternate source valve may be installed adjacent to
the parking brake, and can be used if the external static source is
malfunctioning. This valve supplies static pressure from inside the cabin
instead of the external static ports.
If
erroneous instrument readings are suspected due to water or ice in
the pressure line going to the standard external static pressure source, the
1 October 1979
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