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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.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 2
20 Sep 2007 21-00-00 Doc # 6.02.01
Rev. 5
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Figure 1: Cabin Heating System Schematic
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-00-00 Page 3
20 Sep 2007
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.
Air from both front closing panels can flow up through the fuselage side ducts. Adjustable outlets
in the cockpit allow the pilots or passengers to control cool air flow into the cockpit. Four
adjustable outlets in the roll bar give cool air to the passengers.
Both hot and cold air leave the cockpit through holes in the baggage compartment frame. The
air flows through the rear fuselage and leaves the airplane through the gap between the
fuselage and the rudder.
(2) Additional Ventilation System (optional, OÄM 40-099)
Air enters the system at two NACA air inlets in the front fuselage on the left and right side.
Hoses connect the air inlets to two adjustable outlets in the bottom instrument panel.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 4
20 Sep 2007 21-00-00 Doc # 6.02.01
Rev. 5
NACA Air Inlet
NACA Air Inlet
Cabin Air Control
Cabin Air Control RH
Rear Cabin Air Control
Cabin Air Control LH
Cabin Air
Exhaust
Cabin Air
Exhaust
Sealed
Cover plate
Cover plate
Sealed
Figure 2: Cabin Ventilation System Schematic, Lycoming Version
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-00-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
This table tells you how to trouble-shoot the air conditioning system. If you find the trouble in column
1, do the repair in column 3.
Trouble Possible Cause Repair
Carbon Monoxide detector
becomes dark.
Exhaust muffler cracked. Replace or repair the exhaust
muffler. (Refer to Chapter 78).
Burning smell in the cockpit. Exhaust muffler cracked. Replace or repair the exhaust
muffler. (Refer to Chapter 78).
Heating system supplies warm
air when set to OFF.
Heat valve control cable out of
adjustment.
Heat valve control cable
broken.
Adjust the heat valve control
cable.
Replace the heat valve control
cable.
No hot air flows to the canopy. Distributor valve control cable
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