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IGNITION) must come on.
The RPM must return to 2000 RPM. If
the LASAR system is installed, the
ignition status light (IGN or IGNITION)
must go off after 20 seconds.
The maximum difference between the
left and right magneto RPM drop is 50
RPM.
(4) Do a test of the alternate air:
S Set the alternate air control to ON for 10 - 15
seconds.
S Set the alternate air control to OFF.
AIRCRAFT
Power Plant DA 40 Series
AMM
Detail Steps/Work Items Key Items/References
Page 242
20 Sep 2007 71-00-00 Doc # 6.02.01
Rev. 5
(5) Do a test of the propeller control:
S Move the propeller control smoothly to MIN
RPM.
S Move the propeller control smoothly to MAX
RPM.
The RPM must decrease.
The RPM must return to 2000 RPM.
(6) Do a test of engine static RPM:
S Set the propeller control to MAX RPM.
S Set the throttle control to FULL.
S Move the propeller control slowly towards min
RPM until the RPM reduces by 25RPM.
S Set the propeller control to MAX RPM.
S Set the throttle to IDLE.
Note the engine RPM. It must be within
the operating limits given in the
Lycoming Operator's Manual.
If you must move the propeller control a
long way to get the 25 RPM decrease,
then the pitch of the propeller will set
the static RPM. Refer to the Propeller
Owner's Manual to adjust the propeller
pitch.
If you must only move the propeller
control a small way to get the 25 RPM
decrease, then the propeller governor
will set the static RPM. Refer to
propeller governor manufacturer's
manual to adjust the governor.
Note: Operate the engine at up to 2000 RPM for 20 to 30 seconds before each
measurement. This will allow the engine to stabilize between measurements.
AIRCRAFT
DA 40 Series
AMM
Power Plant
Detail Steps/Work Items Key Items/References
Doc # 6.02.01
Rev. 5 71-00-00 Page 243
20 Sep 2007
(7) Measure the idle RPM.
S Make sure that the oil temperature is at least
175 °F. If it is not, operate the engine at up to
2000 RPM until the oil temperature is 175 °F.
S Make sure that the propeller control lever is
set to MAX RPM.
S Make sure that the mixture control lever is set
to full RICH.
S Set the throttle to IDLE. Make a note of the
idle RPM.
Low oil temperature can change the
idle RPM.
Fully forward.
Fully forward.
Allow the RPM to become stable. See
Paragraph 8.B for the idle RPM
adjustment procedure.
Note: Operate the engine at up to 2000 RPM for 20 to 30 seconds before each
measurement. This will allow the engine to stabilize between measurements.
AIRCRAFT
Power Plant DA 40 Series
AMM
Page 244
20 Sep 2007 71-00-00 Doc # 6.02.01
Rev. 5
Detail Steps/Work Items Key Items/References
(8) Measure the idle control mixture setting:
S Make sure that the oil temperature is at least
175 °F. If it is not, operate the engine at up to
2000 RPM until the oil temperature is 175 °F.
S Make sure that the mixture control lever is set
to full RICH.
S Set the throttle to IDLE.
S Move the mixture control lever smoothly
towards the LEAN position.
S Move the mixture control lever to the full
RICH position before the engine stops.
Fully forward.
Allow the idle RPM to become stable.
If the idle RPM increases by more than
50 RPM before decreasing then the
mixture is too rich. If the idle RPM
decreases immediately, then the
mixture is too lean.
See Paragraph 8.C for the idle mixture
adjustment.
(9) Do a test of the function of the fuel selector/shutoff
valve:
S Set the engine to 1000 - 1200 RPM.
S Set the fuel shut-off valve to OFF.
S Set the fuel shut-off valve to ON.
S Set the ignition to OFF.
The engine must stop within 2 minutes.
(10) Start the engine. Refer to Paragraph 5.
AIRCRAFT
DA 40 Series
AMM
Power Plant
Doc # 6.02.01
Rev. 5 71-00-00 Page 245
20 Sep 2007
B. Adjust the Engine Idle Speed
Detail Steps/Work Items Key Items/References
Note: Do this work quickly. If the oil temperature is less than 175 °F, it can change the
idle RPM.
(1) Shut down the engine. Refer to Paragraph 9.
(2) Remove the engine cowlings. Refer to Section 71-10.
(3) Set the throttle lever to IDLE. Make sure that the throttle lever at the
injector is against the throttle stop
screw. If the throttle lever at the injector
is NOT against the idle stop screw,
adjust the throttle control, see Section
76-00.
(4) Start the engine. Refer to Paragraph 7.
　
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