Pitot-Static System And Instruments - Cessna TR182 1979 Pilot Operating Handbook

CESSNA
MODEL TR182
SECTION 7
AIRPLANE
&
SYSTEMS DESCRIPTIONS
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, rate-of-climb
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 Onthe left and right sides of the forward fuselage, and
the associated plumbing necessary to connect the instruments 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 lO-amp push-to-
reset circuit breaker on the left side of the ewitoh and control panel, and
associated wiring. When the pitot heat switch is turned On,the element in
the pitot tube is heated electrically to maintain proper operation in
possible icing conditions. Pitot heat should be used only as required.
A static pressure alternate source valve is installed adjacent to the
parking brake, and can be used
if
the external static source is malfunction-
ing. 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
alternate static source valve should be pulled on.
Pressures within the cabin will vary with heater/vents opened or
closed, and windows open. Refer to Sections 3 and 5for the effect of varying
cabin pressures On airspeed and altimeter readings.
1 October 1978 7-41