S 284-050
(5)
Look to see if hydraulic fluid leaks from the screws and correct as necessary.
H. Return the Airplane to Its Initial Condition
S 464-070
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 414-051
(2)
Close the service access panel, 324BL.
S 864-052
(3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11C12, STAB TRIM SHUTOFF LEFT
(b)
11C13, STAB TRIM SHUTOFF RIGHT
(c)
11G8, HF COMM LEFT (if installed)
(d)
11G34, HF COMM RIGHT (if installed)
(e)
11H17, FLT CONT SHUTOFF TAIL LEFT
(f)
11H18, FLT CONT SHUTOFF TAIL CENTER
(g)
11H28, FLT CONT SHUTOFF TAIL RIGHT
S 984-053
(4)
Put the L, C, and R FLT CONTROL SHUTOFF switches in the OFF
position.
(5)
Put the R and C STAB TRIM switches in the NORM position.
S 864-055
(6)
Remove the pressure from the left and center hydraulic systems (AMM 29-11-00/201).
(7)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 984-054
S 864-056
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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ALL ú ú 02 Page 410 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
YDS ELECTROHYDRAULIC SERVOVALVE AND SOLENOID VALVES - MAINTENANCE PRACTICES
___________________________________________________________________________
1. General (Fig. 201)
_______
A. The two Yaw Damper Servos are on the rear spar of the vertical stabilizer. Each servo unit has one electrohydraulic servovalve (EHSV) and one solenoid valve. Removal/Installation procedures are the same for the two valves. You can access the servos through the trailing edge service access panel, 324BL, of the vertical stabilizer (AMM 06-42-00/201).
TASK 22-21-03-022-059
2. Remove Electrohydraulic Servovalve and Solenoid 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
(2)
AMM 24-22-00/201, Electrical Power - Control
(3)
AMM 27-21-00/501, Rudder and Rudder Trim Control System
(4)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
(5)
AMM 29-11-00/201, Pressurize/Depressurize Main Hydraulic System
(6)
AMM 31-41-00/501, Engine Indication and Crew Alerting System
(7)
AMM 32-09-02/201, Air/Ground Relays
(8)
AMM 33-16-00/501, Master Dim and Test
(9)
AMM 34-12-00/501, Air Data Computing System
(10)
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. Prepare For Removal
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
22-21-03
ALL ú ú 01 Page 201 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
ACCESS
SEEA
PANEL, 324BL
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