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2. Description
Figure 1 shows you the propeller. The propeller attaches to the engine crankshaft flange bushings with six special bolts (stud with a castle nut; castle nut attached to stud by means of a split pin). The bolts are locked with wire. The bolts are retained within the propeller hub.
A spinner bulkhead (spinner backplate) attaches to the rear of the hub with six bolts. The bolts are locked with wire. A front support plate attaches to the front of the hub with six screws. The screws are locked with wire. A spinner which is made from composite material attaches to the aft bulkhead with screws. The spinner is supported by the front support plate. Screws attach the spinner to the front support plate.
The propeller has a Woodward governor. The governor attaches to a drive pad on the left side of the engine at the front. The governor controls the propeller pitch hydraulically. Engine oil flows through internal oil galleries to the governor. The governor has a geared oil pump which increase the oil pressure. The oil flows from the governor to the propeller hub through the hollow crankshaft.
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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.
In normal flight the propeller governor will maintain the RPM set by the pilot and also control the engine maximum RPM.
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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Trouble-Shooting
1. General
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.
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. 
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-12-B/180-17 Propeller
A. Remove the Propeller
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 ignition switch to OFF. S Set the throttle to IDLE. S Set the mixture control to LEAN CUT-OFF. 
　
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