S 032-012
(2)
Remove the lockwire from the mounting bolts.
S 032-013
(3)
Remove the mounting bolts from the valve assembly.
S 022-014
(4)
Remove the valve assembly.
S 032-015
(5)
Remove the O-ring.
S 032-016
(6)
Remove the gasket plate from the servo unit.
S 392-017
(7)
Cover all the openings.
TASK 22-21-03-422-062
3. Install Valve_____________
A. Equipment
(1) Torque Wrench - Commercially available (For
torque range, Ref Fig. 201)
B. Consumable Materials
(1) D00148 Hydraulic Fluid, Fire Resistant,
BMS 3-11
C. References
(1) AMM 06-42-00/201, Empennage (Major Zone 300) Access Doors and Panels
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A
757
MAINTENANCE MANUAL
(2)
AMM 20-10-23/401, Lockwires
(3)
AMM 24-22-00/201, Electrical Power - Control
(4)
AMM 27-21-00/501, Rudder and Rudder Trim Control System
(5)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
(6)
AMM 29-11-00/201, Pressurize/Depressurize Main Hydraulic System
(7)
AMM 31-41-00/501, Engine Indication and Crew Alerting System
(8)
AMM 32-09-02/201, Air/Ground Relays
(9)
AMM 33-16-00/501, Master Dim and Test
(10)
AMM 34-12-00/501, Air Data Computing System
(11)
AMM 34-21-00/501, Inertial Reference System
D. Access
(1)
Location Zones 211/212 Flight Compartment 324 Vertical Stabilizer - rear spar to trailing edge
(2)
Access Panel
324BL Vertical Stabilizer - trailing edge
E. Procedure
S 862-093
WARNING: MAKE SURE PERSONNEL STAY A MINIMUM OF 6 FEET AWAY FROM THE
_______ VERTICAL STABILIZER WHEN THE HF SYSTEM TRANSMITS. RF ENERGY FROM THE HF COMMUNICATION ANTENNA CAN CAUSE INJURIES TO PERSONNEL.
(1)
Make sure the HF system does not transmit.
S 012-018
(2)
Remove the covers from the openings and clean the mating surfaces of the valve, the gasket plate and servo assembly with clean hydraulic fluid. Do not allow the hydraulic fluid to go into the electrical connector.
S 432-019
(3)
Install the new gasket plate on the servo unit.
S 642-020
(4)
Lubricate the new O-ring with BMS 3-11 and install it.
S 422-021
(5)
Install the valve assembly with the mounting bolts and the
washer/spacer.
NOTE: The countersink on the washer/spacer must be towards the
____
bolthead.
S 492-022
(6) Set the torque wrench to 50-70 pound-inches.
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A
757 MAINTENANCE MANUAL
S 432-023
(7)
Tighten the mounting bolts to 50-70 pound-inches.
S 432-024
(8)
Install the lockwire on the mounting bolts (AMM 20-10-23/401).
TASK 22-21-03-722-063
4. Test Yaw Damper Electrohydraulic Servovalve And Solenoid Valve______________________________________________________________
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