Heating
The heating provides heated air to the cockpit and the cabin, and heated air for defogging the windshield. It consists of the components that follow:
Bleed air hose
The bleed air hose takes hot compressed air from the engine to route it to the cabin for heating and defogging. It consists of the bleed air hose assembly and the bleed air fitting. It is located in the engine compartment on the right site.
Bleed air valve
The bleed air valve controls the flow of air. It is a ball valve assembly with a bracket for attaching the control cable. It is located below the horizontal firewall.
Bleed air control assembly
The bleed air control assembly positions the ball valve in the bleed air valve. It is a cable assembly with one end attached to the bracket, routed through the right side of the fuselage, under the floor and in to the pedestal. The other end has the control for the operator.
Aft fuselage air tube
The aft fuselage air tube routes the air from the bleed air valve to the fuselage air tubes. It consists of a rigid aluminum tube with coupling nuts. It is located on the right side in the aft fuselage.
Fuselage air tubes
The fuselage air tubes route the air from the aft fuselage air tube to the cabin air control valve. They consist of tube segments made of rigid aluminum tubes with coupling nuts, unions between the segments and the aft fuselage air tube join them together.
Cabin air control valve
The cabin air control valve selects between the heating ejectors and the defog ejectors to route the air. It is a rotary valve mounted on a support bracket. It is located on the canted bulkhead inside the nose cone.
Cabin air control assembly
The cabin air control assembly controls the cabin air control valve. It consists of the control knob, rod assembly, and bushing. It is located in the pedestal.
Heater ducts
The heater ducts route the air to the heater outlets. They are located on both sides of the canted bulkhead, inside the nose cone and the cockpit.
Heater outlets
The heater outlets takes the hot compressed air from the heater ducts and mixes it with the ambient air for heating. They are located on both sides of the canted bulkhead in the cabin.
Windshield defogs
The windshield defog takes the hot compressed air from the engine bleed air and mixes it with the cockpit ambient air to defog the windshields. It consists of perforated tubing. They are located on both side of the canted bulkhead below both windshields.
Operation
The hot compressed air exits the engine through the bleed air hose to the bleed air valve. The bleed air control assembly controls the flow of air by adjusting the ball valve inside the bleed air valve. The air is routed to the cabin air control valve through the aft fuselage air tube and the fuselage air tubes. The cabin air control assembly changes the position of the stem in the cabin air control valve between heat and defog. The operator can select any variation between the two positions. The flow of air is directed to the outlets and windshield defogs, each getting more or less air depending on the position of the cabin air control valve adjusting for heating air, defog air, or both if needed.
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