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Piston
Return Spring
Oil Return
To Sump
Oil Return
To Sump
Fly Weights
Speeder Spring
Control Lever
Low
Pitch Stop
High
Pitch Stop
Drive Shaft
Relief Valve
Oil Pump
Oil Pump
Pilot Valve
Oil From
Propeller
Oil To
Propeller
No Oil Flow
Figure 1: Propeller Governor Schematic Diagram
AIRCRAFT
DA 40 Series
AMM
Propeller
Doc # 6.02.01
Rev. 5 61-20-00 Page 3
20 Sep 2007
B. Under-Speed Condition
When the engine speed is less than the selected speed, then the governor operates as follows:
) The speeder spring force is greater than the force from the flyweights and the spring pushes the
pilot-valve down.
) The pilot-valve connects the propeller to the oil-return.
) The oil flows from the propeller and the centrifugal twisting moment of the blades turn the blades
towards fine pitch. This decreases the load on the engine.
) The engine speed increases until the flyweights move the pilot-valve to close the oil return
connection and the force from the governor flyweights balance the force from the spring.
C. Over-Speed Condition
When the engine speed is more than the selected speed, then the governor operates as follows:
) The speeder spring force is less than the force from the flyweights, and the flyweights pull the
pilot-valve up.
) The pilot-valve connects the propeller to the oil pump.
) Oil flows into the propeller from the oil pump.
) The propeller blades move towards coarse pitch. This increases the load on the engine.
) The engine speed decreases until the spring moves the pilot-valve to close the oil pump
connection and the force from the governor flyweights balances the force from the speeder
spring.
AIRCRAFT
Propeller
DA 40 Series
AMM
Page 4
20 Sep 2007 61-20-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Propeller
Doc # 6.02.01
Rev. 5 61-20-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have in the propeller control system. If you have the trouble
detailed in the Trouble column read across to the Possible Cause column. Then do the repair in the
Repair column. Refer to the propeller manufacturers for more data.
Trouble Possible Cause Repair
Engine vibration. Propeller out of balance.
Spinner out of balance.
Propeller mounting loose.
The spinner attaching screws
loose.
Blade tracking not correct.
Examine the propeller. If you
find damage refer to the
manufacturer’s Owners
Manual.
Replace the spinner.
Tighten the mounting nuts to
the correct torque. Refer to the
manufacturer’s Owners
Manual.
Tighten the attaching screws.
Refer to the manufacturer’s
Owners Manual.
Refer to the manufacturer’s
Owners Manual.
Surging RPM Air in propeller control system.
Oil sludge in the propeller
control system.
Do a ground run-up. Move the
propeller control lever from low
rpm to high rpm. Do this at
least 3 times to bleed the air.
Remove the governor and
remove the propeller. A
specialist propeller repair
station must clean the propeller
and the governor. Flush the
engine oil system.
More than 50 RPM difference
during climb/cruise/dive (up to
50 RPM is normal).
Friction in governor. Replace the governor.
AIRCRAFT
Propeller
DA 40 Series
AMM
Page 102
20 Sep 2007 61-20-00 Doc # 6.02.01
Rev. 5
Trouble Possible Cause Repair
Decrease in rpm during normal
operation without moving the
rpm control lever.
Failure of governor spring. Replace the governor.
Increase in rpm during normal
operation without moving the
rpm control lever.
Oil leak inside the propeller.
Faulty governor drive.
Faulty governor relief valve.
Replace the propeller.
Remove the governor.
Repair/replace defective
components.
Replace the governor.
AIRCRAFT
DA 40 Series
AMM
Propeller
Doc # 6.02.01
Rev. 5 61-20-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This section tells you how to remove/install the governor and how to test/adjust the governor. It also
tells you how to replace/adjust the propeller control cable.
2. Remove/Install the Propeller Governor
A. Remove the Propeller Governor
Detail Steps/Work Items Key Items/References
WARNING: MAKE SURE THAT THE ENGINE IS SAFE BEFORE YOU DO ANY
　
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