Doc # 6.02.01 Page 241
Rev. 4 09 Jan 2003
71-00-00
AMM
DA 40 Series
Detail Steps/Work Items Key Items/References
(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.
71-00-00
Power Plant
AMM
DA 40 Series
Detail Steps/Work Items Key Items/References
(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 6.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.
71-00-00
AMM
DA 40 Series
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 6.C for the idle mixture adjustment.
(9) Do a test of the function of the fuel selector/shut-off 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.
71-00-00
Power Plant
AMM
B. Adjust the Engine Idle Speed
DA 40 Series
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 7.
(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.
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