
SECTION XIII
HEATING AND VENTILATING SYSTEM
13-1. INTRODUCTION. Because of the simplicity of the heating and ventilating system installed on the PA-28-
161 CADET, the operation and maintenance instructions of the components are contained in Paragraph 13-3. A
pictorial description of these systems may be found in Figure 13-1.
13-2. DESCRIPTION. Heat for the cabin is provided by a hot air heater installed on the exhaust manifold. Fresh
air enters the engine compartment through the nose cowling, passes over the engine and is vented to the heater
muffler through a flexible hose located on the baffling at the rear of the engine. The air is then heated and vented
into the cabin area through a valve which can be controlled from the instrument panel. When the valve is
completely closed off, the heated air is vented back into the engine compartment. The heater outlet in the cabin is
located between the two front seats. Control for the heater system is located on the right panel, below the
instruments. The windshield is kept clear of frost, ice, etc., by a defroster system which operates from the heater
muff, but has an individual control.
Fresh air is picked up from an inlet in the leading edge of each wing. The air passes through the wings to
individually controlled outlets located just forward of each seat. An air vent is located in the bottom of the
fuselage to take exhaust air from the cabin interior.
13-3. HEATER MAINTENANCE. If the exhaust manifold should become defective, carbon monoxide fumes
may be discharged into the cabin area. Therefore, it is imperative that the exhaust manifold be inspected
regularly, Refer to Section III for inspection of exhaust system. The heater muff must be removed in order to
inspect the manifold assembly. Check the operation of the push-pull controls to insure the valve doors function
properly. Refer to Figure 13-1 for an illustration of the heater system.
13-4. OVERHEAD VENT SYSTEM. The overhead vent system utilizes the ducting noted in Figure 13-1. Air
enters an inlet at the top of the fin and is ducted through the vent system. Small louvers control the flow of air
into the cabin. This vent system may also be equipped with a blower (optional). This blower, mounted aft of the
closeout panel underneath the top of the fuselage, will force air through the overhead vent system whenever
desired. (For blower information refer to Section XIV.)
THIS SPACE INTENTIONALLY LEFT BLANK
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
H E ATING AND VENTILAT I N G
2G10