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%  airplanes with the Lycoming engine installed. It also gives the trouble-shooting. Refer to Section 78-00 for more maintenance data on the exhaust muffler part of the heat-exchanger.
2. Description and Operation
%  The DA 40 with the Lycoming engine installed has 2 separate systems for heating and cooling/ventilating the cockpit. Figure 1 shows the heating system. Figure 2 shows the cooling and ventilation system.
A. Cabin Heating
Air enters the system through an intake at the front right of the engine cowling. A metal adaptor and flexible hose connects the intake to a heat-exchanger on the engine exhaust muffler. A small hose from the side of the adaptor connects to the back of the electric alternator at the front of the engine.
A shroud round the exhaust muffler and the outside wall of the muffler make the heat exchanger. You can remove the shroud to inspect the muffler for cracks. The shroud has connections for the inlet hose and an outlet hose.
The outlet hose connects to a heat valve on the firewall. A flap inside the heat valve can connect the heat valve outlet to atmosphere or to a distributor valve on the rear face of the firewall. A lever in the cockpit controls the flap. The lever is marked ‘CABIN HEAT, ON OFF’.
The distributor valve also has a flap. The flap can connect the valve inlet to the pilot and passenger floor areas or the front of the canopy. A lever in the cockpit controls the flap. The lever is marked ‘CABIN HEAT’ ...
Cold ambient air enters the air intake on the engine cowling. The air flows to the heat-exchanger on the exhaust muffler. The air goes between the shroud and the muffler. Heat from the outer face of muffler makes the air hot. The air flows to the heat valve.
Doc # 6.02.01 Page 1
Rev. 4 09 Jan 2003

21-00-00
AMM

Heat Control FlapHot Air out (Defrost/Floor)
in Heat Valve To Atmosphere Control Flap in Distributor Valve
STATUS: STATUS:
Cabin Heat ON. Cabin Heat OFF.
Distributor Control ValveDistribution Control Lever in
in Mid Position. Defrost (

 

) Position (Between

and )
Figure 1: Cabin Heating System Schematic
Page 2 Doc # 6.02.01 09 Jan 2003 Rev. 4
21-00-00
Air Conditioning
AMM

If the heat valve is set to OFF, the flap sends the air overboard at the bottom of the engine cowling. If it is set to ON, the hot air goes through the firewall to the distributor valve. The valve can be set to any position between OFF and ON. If the valve is set to a middle position, only part of the airflow goes to the distributor valve.
If the distributor valve is set to ., air flows to the pilots' and passengers' footwells. If it is set to ., the air flows to the front of the canopy. This prevents mist or frost from forming on the canopy. The valve can be set to any position between . and .. If the valve is set to a middle position, part of the airflow goes to the footwells and part to the canopy.
B. Cooling and Ventilation
% (1) Standard Cooling and Ventilation System
Figure 2 shows the cooling and ventilation system. Air enters the system at a NACA air inlet below the leading edge of the left stub-wing. The front main bulkhead and the inner and outer closing ribs make a collector box. Air can only leave the area through an opening in the front closing rib.
The front of the rib connects to a pipe across the fuselage. The pipe also connects to the front closing rib of the right stub-wing.
The top part of the front closing rib on each side connects to the fuselage side ducts. The side ducts connect to the roll bar. The side ducts and roll bar have adjustable outlets.
Air enters the system through the NACA air inlet. It flows through the left front closing rib and across the fuselage. The pilots can control the floor panel outlets to give cool air as necessary. Some air also flows across to the right front closing panel.
　
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