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Validity : S / N 1 — 9999 Page 802
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CONTROLS
DESCRIPTION AND OPERATION
1. GENERAL
The control is the part of the system which controls propeller blade pitch. The main elements of this sub-system are :
- propeller governor,
- propeller governor control.
2. LOCATION (Figures 1 and 2)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
Propeller governor 1 100 121 61-20-01
Propeller governor control 1 100 / 200 121 / 131 / 235L / 61-20-02
235R / 252
3. DESCRIPTION
A. Propeller governor
The propeller governor is the part of the sub-system which controls propeller pitch variation by regulating oil pressure supplied by the engine acting on the propeller hub piston. This variation determines the propeller rotation speed and, consequently the engine RPM to be maintained. The function of the propeller governor is to sense engine RPM and respond to any RPM changes by controlling oil flow. The propeller governor, which is driven by the camshaft through gears, is basically an oil pump, which boots engine oil pressure going towards the propeller.
The propeller governor, through a pilot valve, directs oil pressure to the propeller to increase or reduce blade angle.
It is equipped with a low pitch and high pitch adjusting bolt.
The governor is located behind the starter ring at the engine upper L.H. side.
B. Propeller governor control
The propeller control is actuated using a handle located to the right of the throttle control on the central pedestal of the cockpit. It transmits movement to the propeller governor using a flexible sheathed cable, a control rod and a lever hinged on the propeller governor.
The propeller control has two main positions :
- high pitch (control full rearward),
- low pitch (control full forward).
The maneuvering range between these two positions allows to adjust propeller rotation speed and, consequently the engine RPM to be maintained.
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Validity : S / N 1 - 9999 Page 1
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Propeller governor - Location of components
Figure 1
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Validity : S / N 1 - 9999 61-20-00Page 2
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Propeller governor control — Location of components
Figure 2
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Validity : S / N 1 — 9999 Page 3
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PROPELLER GOVERNOR
REMOVAL / INSTALLATION
1. REMOVAL OF THE PROPELLER GOVERNOR (Figure 401)
A. Tools and consumable materials
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本文链接地址：TB20 MAINTENANCE MANUAL 61 螺旋桨 TB20飞机维护手册(20)
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