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AMM
Page 4
20 Sep 2007 20-00-00 Doc # 6.02.01
Rev. 5
5. Torque Measurement
For self-locking nuts, add the torque value of the locking device (friction or brake torque) to the value
in the table. Read the friction value from the torque wrench before the nut seats.
Where a bolt is tightened from the bolt-head, add the value of the shaft friction (the friction of the bolt
in the attached part) to the value in the table. Read the friction value from the torque wrench before
the bolt seats.
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-TITLE Page 1
20 Sep 2007
CHAPTER 21
AIR CONDITIONING
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 2
20 Sep 2007 21-TITLE Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-CONTENTS Page 1
20 Sep 2007
TABLE OF CONTENTS
CHAPTER 21
AIR CONDITIONING
Section 21-00
Air Conditioning - Lycoming Engine
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Description and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Trouble-Shooting
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Maintenance Practices
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2. Remove/Install the Heat Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
3. Test/Adjust the Heat Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
4. Remove/Install the Distributor Valve . . . . . . . . . . . . . . . . . . . . . . . 205
5. Test/Adjust the Distributor Valve . . . . . . . . . . . . . . . . . . . . . . . . . . 207
6. Remove/Install the Heat Exchanger Shroud . . . . . . . . . . . . . . . . . 209
7. Inspect the Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 2
20 Sep 2007 21-CONTENTS Doc # 6.02.01
Rev. 5
Section 21-01
Air Conditioning - TAE 125 Diesel Engine
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Description and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Trouble-Shooting
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Maintenance Practices
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2. Remove/Install the Heat Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
3. Test/Adjust the Heat Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
4. Remove/Install the Distributor Valve . . . . . . . . . . . . . . . . . . . . . . . 205
5. Test/Adjust the Distributor Valve . . . . . . . . . . . . . . . . . . . . . . . . . . 207
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-00-00 Page 1
20 Sep 2007
CHAPTER 21
AIR CONDITIONING
Section 21-00
Air Conditioning - Lycoming Engine
1. General
This Section gives you the system description and operation of the air conditioning system for
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
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