通航信息_通航_通用航空_General Aviation

ADAA
Validity : S / N 1 - 9999 61 -TC (EA) Page 4 JUN 02
 
PROPELLER
DESCRIPTION AND OPERATION
1. GENERAL
The aircraft is equipped with a HARTZELL two-blade or three-blade (option) constant speed all metal propeller - refer to 61-10-00, controlled by oil pressure using an engine-driven propeller governor - refer to 61-20-00.
2. OPERATION
The governor is operated by a manual control. According to the control position, the governor determines propeller RPM, and thus the engine speed to be maintained. The governor controls engine oil flow, boosted to high pressure by the governor pump on a piston located in the propeller hub.
Oil pressure allows rotation of the blades towards high pitch (low RPM). When oil pressure to the piston is reduced, the blades rotate towards low pitch (high RPM).
 
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I PROPELLER ASSEMBLY
DESCRIPTION AND OPERATION
1. GENERAL
The propeller assembly includes the propeller and the spinner.
2. LOCATION (Figures 1, 1A, 2, 2A and 2B)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
Propeller 1 110 111 61-10-00
Spinner 1 110 / 61-10-00

II 3. DESCRIPTION (Figures 3, 3A, 4, 4A and 4B)
A. Propeller
The two—bladed metal propeller is a constant speed and variable pitch propeller. Its characteristics are :
— nominal diameter : 80 in (2.03 m),
— minimum diameter after rework : 78 in (1.98 m).
The forged light—alloy two—piece hub is bolted along the plane of rotation. Internally the hub contains the pitch change mechanism and the blade roots. The piston, installed in the front of the hub, provides power to change the pitch when acted upon by an outside force.
Boosted oil pressure, from the propeller governor, increases blade angle while centrifugal twisting movement aims at positioning blades towards low pitch.
NOTE : Full low pitch corresponds to high RPM (takeoff, climb, approach and landing), high pitch corresponds to low RPM.
The propeller may be equipped with the de—icing system option — see Figures 4, 4A and 4B.
The propeller de—icing system protects the propeller blades in case of unexpected icing conditions. The de—icing system is based on ejection of "glycol" on each propeller blade leading edge.
B. Spinner
The spinner preserves the aerodynamic profile of the propeller assembly at the propeller hub. It includes holes for its attachments around its edge and two opposite cut—outs which permit installation over the propeller body.
　
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本文链接地址：TB20 MAINTENANCE MANUAL 61 螺旋桨 TB20飞机维护手册(4)