% 3. Operation
% A pre-loaded spring (return spring) turns the propeller blades towards fine pitch. In addition, when the % propeller is turning, centrifugal twisting moments also cause the blades to turn towards fine pitch. % Hydraulic pressure in the cylinder acts on a piston and the piston moves the blades towards coarse % pitch.
% The propeller pitch control system is integrated into the engine. The pitch is controlled automatically % by the ECU. Depending on the power setting the propeller pitch is adjusted so that the required RPM % will be obtained as shown in Figure 2.
% If the hydraulic pressure from the governor fails, the blades turn towards fine pitch. An adjustable fine % pitch stop limits the amount of blade movement towards fine pitch. The fine-pitch-stop is adjusted to % give maximum static RPM. If the governor fails during flight it is possible to over-speed the propeller. % Refer to Section 05-50 for data on over-speeds.
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% Figure 2: Propeller RPM Adjusted by the ECU %
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% % 1. General Trouble-Shooting
% % % The table below lists the defects you could have for the propeller. 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.
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Trouble Possible Cause Repair
Engine vibration. Propeller out of balance. Spinner out of balance. Propeller mounting loose. 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.
Cracks in the blades. Over-speed. Refer to the manufacturer’s Owners Manual.
Holes/nicks/dents in the blade. Stone damage. Repair/replace the propeller. Refer to the manufacturer’s Owners Manual.
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% Maintenance Practices % 1. General
% These maintenance practices tell you how to remove and install the propeller. And they tell you how to % do a propeller blade tracking test. % % 2. Remove/Install the MTV-6-A Propeller
% A. Remove the Propeller % %
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Detail Steps/Work Items Key Items/References
WARNING: MAKE SURE THAT THE ENGINE IS SAFE BEFORE YOU DO ANY WORK ON THE PROPELLER. IF THE ENGINE IS TURNED, THE PROPELLER CAN CAUSE INJURY OR DEATH.
(1) Make sure that the engine is safe: S Set the ELECTRIC MASTER key switch to OFF. S Set the ENGINE MASTER switch to OFF. S Set the power lever to IDLE.
(2) Remove the engine cowlings. Refer to Section 71-11.
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本文链接地址：钻石40飞机维护手册 DA 40 SERIES AMM 4(79)
