757 AMM 飞机维护手册 液压 CHAPTER 29 - HYDRAULIC POWER 2(99)

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RAM AIR TURBINE (RAT) A SEE B SPEED SENSOR 
TURBINE HUB 
SCREW (2 LOCATIONS) COVER SPEED SENSOR (2 LOCATIONS) SCREW 
GEAR SPEED SENSOR  SENSOR SPEED CSEE 
SPEED SENSOR INSERT SENSOR SPEEDLOCKWASHER KEY  HOUSING RAT STRUT 
B 
Speed Sensor Adjustment with a Locknut Figure 501 (Sheet 1) 

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A
757
MAINTENANCE MANUAL

 

THE CLEARANCE BETWEEN THE SPEED SENSOR AND THE GEAR IS 0.010 |0.002 INCH
THE DEPTH OF THE SPEED SENSOR INTO THE RAT STRUT HOUSING (DIMENSION "C") IS CALCULATED AS FOLLOWS: "C" |0.002 = ("A"-"B") -0.010
Speed Sensor Adjustment with a Locknut
Figure 501 (Sheet 2)

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A

757
MAINTENANCE MANUAL

RAM AIR
TURBINE
(RAT)

SEE A
DOOR FOR THE RAM AIR TURBINE (RAT) COMPARTMENT
FWD SPEED SENSOR
RAM AIR TURBINE (RAT)
SEE B
A
TURBINE HUB
SCREW (2 LOCATIONS)
SPEED SENSOR COVER
RAT STRUT HOUSING
SPEED SENSOR
GEAR

SPEED
SENSOR

SCREW SEE C
(2 LOCATIONS) SPEED SENSOR SHIM
SPEED SENSOR
B

Speed Sensor Adjustment with a Shim Figure 502 (Sheet 1)
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A

757
MAINTENANCE MANUAL

SHIM

THE CLEARANCE BETWEEN THE SPEED SENSOR AND
THE GEAR IS 0.010 |0.002 INCH

THE DEPTH OF THE SPEED SENSOR INTO THE RAT
STRUT HOUSING (DIMENSION "C") IS CALCULATED
AS FOLLOWS: "C" = ("A"-"B") -0.010

THE SHIM THICKNESS (DIMENSION "E")
IS CALCULATED AS FOLLOWS:
"E" |0.002 = "D"-"C"

Speed Sensor Adjustment with a Shim Figure 502 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A

757
MAINTENANCE MANUAL

 2) Remove the speed sensor insert and the lockwasher from the speed sensor. 3) Install a speed sensor insert and a new key lockwasher on the speed sensor.
 NOTE: Do not bend the tabs on the lockwasher at this time.
____
 4)  Adjust the speed sensor insert and the locknut until Dimension C on the speed sensor is correct, then tighten the locknut as follows: a) Tighten the locknut to 10-15 pound-inches.
　
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