757 AMM 飞机维护手册 自动飞行 AUTOFLIGHT 2(151)

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 1.  General (Fig. 1)_______
 A.  The autothrottle Power Lever Angle (PLA) transducer is on the intermediate gearbox assembly (right side of each engine). This assembly is driven by a push pull cable which is controlled by the thrust lever.
 2.  Component Details_________________
 A.  Autothrottle Power Lever Angle Transducer
 (1)  
The autothrottle power lever angle transducer is a Rotary Variable Differential Transformer Transducer (RVDT) with a 80 degree rotary range. It is ac powered, moving a slug inductive device that outputs an ac voltage proportional to the angle displaced. The 26 volt ac, 400 Hz excitation is supplied by the TMC.

 (2)  
The autothrottle PLA transducer is approximately 2 inches in diameter and three inches high. One electrical connector on the side of the transducer housing contains the following pins:

 (a)  
26 volts ac excitation (2 pins)

 (b)  
2 wire output (2 pins)

 (c)  
Case ground (1 pin)

 

 (3)  
The autothrottle PLA transducer is mounted on the intermediate gearbox assembly with three bolts.

 3.  Operation_________
 A.  Functional Description
 (1)  The thrust levers move sheathed cables which in turn controls the intermediate gearbox assy. The intermediate gearbox assy drives the PLA by means of a gear on the PLA shaft. As the thrust (power) levers are moved the PLA outputs an ac voltage proportional to the angle moved by the thrust lever. The PLA transducer continually senses changes in the power lever angle and provides position feedback to the TMC. If the PLA aft or forward limits are reached, the TMC automatically switches to the respective PLA limit function in the TMC.
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757
MAINTENANCE MANUAL

SEEA
RIG PIN
AUTOTHROTTLE POWER LEVER ANGLE (PLA) TRANSDUCER
ELECTRICAL CONNECTOR
BOLT AND WASHER (3 PLACES)
INTERMEDIATE POWER CONTROL LINKAGE BOX
INTERMEDIATE GEAR BOX ASSEMBLY
A

Autothrottle Power Lever Angle Transducer Installation
Figure 1

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757
FAULT ISOLATION/MAINT MANUAL

THRUST MANAGEMENT ENGINE

Thrust Management Engine - Component Index
Figure 101

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E45788
A

757
FAULT ISOLATION/MAINT MANUAL

FAN COWL PANEL, 
413AL (LEFT ENGINE, OUTBOARD), 
423AL (RIGHT ENGINE, INBOARD) 
INTERMEDIATE 
GEARBOX ASSEMBLY 
SEE  A 
AUTOTHROTTLE POWER
LEVER ANGLE (PLA) 
TRANSDUCER, TS5029 
(AMM 22-33-01/401) 

INTERMEDIATE POWER
CONTROL LINKAGE BOX

INTERMEDIATE GEARBOX ASSEMBLY (REF)
A

Thrust Management Engine - Component Location
Figure 102

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757 MAINTENANCE MANUAL
 AUTOTHROTTLE POWER LEVER ANGLE TRANSDUCER - REMOVAL/INSTALLATION
________________________________________________________________
 TASK 22-33-01-004-043
 1.  Autothrottle Power Lever Angle Transducer Removal and Installation__________________________________________________________________
　
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