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pressure to the propeller to change blade angle as necessary. The engine control system sets the RPM
value for the CSU. Depending on the power setting the propeller pitch is adjusted so that the required
RPM will be obtained as shown in Figure 1.
The inlet oil pressure at the CSU is 20 bar (290 psi). If the engine speed is too high, the CSU connects
the inlet oil pressure to the propeller piston. The piston moves to increase the blade angle. This
reduces the RPM.
If the engine speed is too low, the CSU operates the governor three-way-valve so that the oil flows out
of the propeller. The piston moves to reduce the blade angle. This increases engine RPM.
AIRCRAFT
Propeller
DA 40 Series
AMM
Page 2
20 Sep 2007 61-21-00 Doc # 6.02.01
Rev. 5
2000
2300
2175
1750
0
RPM
0 20 % LOAD 75 100
Figure 1: Propeller RPM adjusted by the ECU
AIRCRAFT
DA 40 Series
AMM
Power Plant
Doc # 6.02.01
Rev. 5 71-TITLE Page 1
20 Sep 2007
CHAPTER 71
POWER PLANT
AIRCRAFT
Power Plant DA 40 Series
AMM
Page 2
20 Sep 2007 71-TITLE Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Power Plant
Doc # 6.02.01
Rev. 5 71-CONTENTS Page 1
20 Sep 2007
TABLE OF CONTENTS
CHAPTER 71
POWER PLANT
Section 71-00
Power Plant - Lycoming Engine
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Description and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Trouble-Shooting
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Maintenance Practices
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2. Remove/Install the Engine (without the Engine Mount) . . . . . . . . 203
3. Install the Engine (without the Engine Mount) . . . . . . . . . . . . . . . . 214
4. Remove the Engine with the Engine Mount . . . . . . . . . . . . . . . . . 224
5. Install the Engine with the Engine Mount . . . . . . . . . . . . . . . . . . . 230
6. Engine Test General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
7. Engine Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
8. Measure/Adjust Engine Performance . . . . . . . . . . . . . . . . . . . . . . 241
9. Engine Shut-Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
10. After Engine Shut-Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
11. Engine Break-In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
AIRCRAFT
Power Plant DA 40 Series
AMM
Page 2
20 Sep 2007 71-CONTENTS Doc # 6.02.01
Rev. 5
Section 71-01
Power Plant - TAE 125 Diesel Engine
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Description and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Engine Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Trouble-Shooting
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Maintenance Practices
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2. Remove/Install the Engine (without the Engine Mount) . . . . . . . . 201
3. Engine Test General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Section 71-10
Engine Cowlings - Lycoming Engine
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Trouble-Shooting
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Maintenance Practices
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2. Remove the Engine Cowlings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
3. Install the Engine Cowlings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
4. Cleaning and Painting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
AIRCRAFT
DA 40 Series
AMM
Power Plant
Doc # 6.02.01
Rev. 5 71-CONTENTS Page 3
20 Sep 2007
Section 71-11
Engine Cowlings - TAE 125 Diesel Engine
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
　
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