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Air enters the system through the NACA air inlet. It flows through the left front closing rib and
across the fuselage, to the right front closing rib.
Air from both front closing ribs can flow up through the fuselage side ducts. Four adjustable
outlets in the roll bar give cool air to the passengers.
(3) Instrument Cooling
Cool air for instrument cooling goes forward through the left and right fuselage side ducts.
C. Air Exit
Both hot and cold air leave the cockpit through slots 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.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 4
20 Sep 2007 21-01-00 Doc # 6.02.01
Rev. 5
NACA Air Inlet
NACA Air Inlet
NACA Air Inlet
Cabin Air Control
Cabin Air Control RH
Instrument Cooling Air
Instrument Cooling Air
Rear Cabin Air Control
Cabin Air Control LH
Cabin Air
Exhaust
Cabin Air
Exhaust
Sealed
Sealed
Figure 2: Cabin Ventilation System Schematic Diagram
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-01-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the air conditioning system. If you have the
trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair
given in the Repair column.
Trouble Possible Cause Repair
No hot air flows to the system
at any setting.
Heat valve control cable out of
adjustment.
Adjust the heat valve control
cable.
Heat valve control cable
broken.
Replace the heat valve control
cable.
Defective heat exchanger. Trouble-shoot in accordance
with Section 75-01.
Defective engine cooling
system.
Trouble-shoot in accordance
with Section 75-01.
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
out of adjustment.
Adjust the distributor valve
control cable.
Distributor valve control cable
broken.
Replace the distributor valve
control cable.
Canopy defrost hose
disconnected.
Re-connect hose.
No hot air flows to the
footwells.
Distributor valve control cable
out of adjustment.
Adjust the distributor valve
control cable.
Distributor valve control cable
broken.
Replace the distributor valve
control cable.
Air hose to footwell
disconnected.
Re-connect hose.
No cool air from 1 outlet. Other
outlets operate correctly.
Outlet defective. Replace the cool air outlet.
Air duct blocked. Remove blockage.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 102
20 Sep 2007 21-01-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-01-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section gives you the maintenance practices for the cabin heating system and tells you how to
replace outlets for the cooling system. Refer to Section 75-01 for maintenance data on the heatexchanger.
2. Remove/Install the Heat Valve
Refer to Figure 3.
A. Remove the Heat Valve
Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. Refer to Section 71-11.
WARNING: IF THE ENGINE HAS BEEN RUNNING, TAKE CARE WHEN YOU
TOUCH THE HEAT VALVE. THE HEAT VALVE GETS HOT.
(2) Release the worm drive clamp which holds the
flexible hose to the heat valve. Then disconnect
the hose from the valve.
(3) Set the CABIN HEAT control lever to ON.
(4) Loosen the screw which holds the control cable to
the swivel fitting in the heat valve.
Access through the front of the valve.
(5) Remove 4 nuts and washers which attach the
heat valve to the firewall.
(6) Remove the heat valve from the firewall.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 202
20 Sep 2007 21-01-00 Doc # 6.02.01
Rev. 5
Firewall
Floor Panel
Distributor Valve
Heat Valve
Swivel
Fitting
Swivel Fitting
Instrument Panel Cover
Defrost Hose
Defrost
Hose
Attaching Bolt
Washer
Heat Valve Control Cable
Heat Valve Control
　
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