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light. If you find soot marks or cracks,
you must remove the muffler for repair
or replace it.
(4) Install the heat exchanger shroud. Refer to Paragraph 6.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 212
20 Sep 2007 21-00-00 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 1
20 Sep 2007
Section 21-01
Air Conditioning - TAE 125 Diesel Engine
1. General
This Section gives you the system description and operation of the air conditioning system for
airplanes with the TAE 125 Diesel engine installed. It also gives the trouble-shooting. Refer to Section
75-01 for more maintenance data on the coolant heat-exchanger.
2. Description and Operation
The DA 40 with the TAE 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
Cold ambient air enters the system through an intake at the front right of the engine cowling. The
air flows through a duct to a heat-exchanger.
The heat exchanger attaches to the lower right part of the engine mount. Two pipes connect the
heat exchanger to the engine cooling system. Hot coolant from the engine cooling system goes to
and from the heat exchanger through these pipes.
Heat from the coolant makes the air hot. A glass-fiber shroud round the air outlet from the heat
exchanger connects to an outlet hose. The hose connects to the heat valve on the forward face of
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
‘DEFROST - FLOOR'.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 2
20 Sep 2007 21-01-00 Doc # 6.02.01
Rev. 5
DEFROST
FLOOR
Floor Heat/Defrost
Distributor Valve
Defrost Hot Air
Instrument Panel Cover
Control
Levers
Pilots Floor Hot Air
Passengers Floor Hot Air
STATUS:
Cabin Heat ON.
Distributor Control Valve
in Mid Position.
(Between and )
STATUS:
Cabin Heat OFF.
Distribution Control Lever in
Defrost ( ) Position
Heat Control Flap
in Heat Valve
Distribution
(Defrost/Floor)
Control Flap
in Distributor Valve
Hot Air out
To Atmosphere
Air
Intake
Firewall
Canopy
CABIN HEAT
OFF
CABIN HEAT
ON
Engine
Cooling
System
Heat
Exchanger
Figure 1: Cabin Heat Schematic Diagram
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-01-00 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 FLOOR, air flows to the pilots' and passengers' footwells. If it is set
to DEFROST, 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 FLOOR and DEFROST. 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
Figure 2 shows the cooling and ventilation system.
(1) Pilots' Cabin Air
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.
(2) Passengers' Cabin Air
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 hose 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.
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