Cabin Heating, Ventilating And Defrosting System - Cessna 150 COMMUTER 1976 Pilot Operating Handbook

SECTION 7
AIRPLANE & SYSTEMS DESCRIPTIONS
CESSNA
MODEL 150M
flood light in the forward part of the overhead console. To use the flood
lighting, rotate the PANEL LT rheostat control knob clockwise to the de-
sired intensity.
The radio equipment, wing flap position indicator, and magnetic com-
pass have integral lighting. The light intensity of all integral lighting is
controlled by the RADIO LT rheostat control knob.
A cabin dome light is located in the aft part of the overhead console,
and is operated by a switch on the lower portion of the instrument panel.
To turn the light on, place the switch in the ON position.
A control wheel map light is available and is mounted on the bottom of
the pilot's control wheel. The light illuminates the lower portion of the
cabin just forward of the pilot and is helpful when checking maps and other
flight data during night operations. To operate the light, first turn on the
NAV LIGHTS switch; then adjust the map light's intensity with the knurled
disk type rheostat control located at the bottom of the control wheel.
The most probable cause of a light failure is a burned out bulb; how-
ever, in the event any of the lighting systems fail to illuminate when turn-
ed on, check the appropriate circuit breaker. If the circuit breaker has
opened (white button popped out), and there is no obviOUS indication of a
short circuit (smoke or odor), turn off the light switch of the affected
lights, reset the breaker, and turn the switch on again. If the breaker
opens again, do not reset it.
CABIN HEATING, VENTILATING AND
DEFROSTING SYSTEM
The temperature and volume of airflow into the cabin can be regulated
to any degree desired by manipulation of the push-pull CABIN HT and
CABIN AIR control knobs (see figure 7-8).
Heated fresh air and outside air are blended in a cabin manifold just
aft of the firewall by adjustment of the heat and air controls; this air is
then vented into the cabin from outlets in the cabin manifold near the
pilot's and passenger's feet. Windshield defrost air is also supplied by
a duct leading from the manifold.
Full ventilation air may be obtained by utilization of the adjustable
ventilators near the upper left and right corners of the windshield, and
by pulling the CABIN AIR control knob out. The CABIN HT control knob
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CESSNA
MODEL 150M
EXHAUST
MUFFLER
SHROUD
HEATER
VALVE
SECTION 7
AIRPLANE & SYSTEMS DESCRIPTIONS
VENTILA TING
AIR DOOR
DEFROSTER----~~--~(;4J
OUTLET
ADJUSTABLE--~---J
VENTILATOR
CODE
(J
RAM AIR FLOW
<? VENTILATING AIR
~ HEATED AIR
~ CONDITIONED AIR
MECHANICAL
CONNECTION
L..-_~
_ _
ADJUSTABLE
VENTILATOR
Figure 7-8. Cabin Heating, Ventilating, and Defrosting System
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