GASKET
PLATE
O-RING
ELECTROHYDRAULIC SERVOVALVE
SPACER
BOLT
WASHER
GASKET
PLATE BOLT
O-RING
SOLENOID
VALVE
YDS ELECTROHYDRAULIC SERVOVALVE AND SOLENOID VALVES
A
YDS Electrohydraulic Servovalve and Solenoid Valves
Figure 201
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A
757 MAINTENANCE MANUAL
S 862-001
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
_______ HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO A PERSON OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
(1) Supply electrical power (AMM 24-22-00/201).
S 842-003
WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPOILERS OR MOVE ALL
_______ PERSONS AND EQUIPMENT AWAY FROM THE SPOILER PANELS. THE SPOILERS CAN RETRACT QUICKLY AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Do the deactivation procedure for the spoilers (AMM 27-61-00/201) or move all persons and equipment away from the spoiler panels.
S 862-004
(3)
Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11A18, YAW DAMPER LEFT
(f)
11F34, YAW DAMPER RIGHT
(b) 11C6, CSEU 1L AC
or
FLT CONT FLEC 1L AC
(c) 11C7, CSEU 1L DC
or
FLT CONT ELEC 1L DC
(d) 11C8, CSEU 2L AC
or
FLT CONT ELEC 2L AC
(e) 11C9, CSEU 2L DC
or
FLT CONT ELEC 2L DC
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757
MAINTENANCE MANUAL
(g)
11G17, CSEU 1R AC
or
FLT CONT ELEC 1R AC
(h)
11G18, CSEU 1R DC
or
FLT CONT ELEC 1R DC
(i)
11G27, CSEU 2R AC
or
FLT CONT ELEC 2R AC
(j)
11G28, CSEU 2R DC
or
FLT CONT ELEC 2R DC
S 862-005
(4)
For the left servo valves, remove pressure from the left hydraulic system.
S 862-006
(5)
For the right servo valves, remove pressure from the center hydraulic system (AMM 29-11-00/201).
S 982-007
(6)
Make sure the L, C, and R FLT CONTROL SHUTOFF switches on the panel P61 are in the OFF position.
S 982-008
(7)
Put the STAB TRIM switches on control stand panel, P10, in the CUT OUT position.
S 862-009
(8)
Open these circuit breakers on the panel P11 and attach DO-NOT-CLOSE tags:
(a)
11C12, STAB TRIM SHUTOFF LEFT
(b)
11C13, STAB TRIM SHUTOFF RIGHT
(c)
11H17, FLT CONT SHUTOFF TAIL LEFT
(d)
11H18, FLT CONT SHUTOFF TAIL CENTER
(e)
11H28, FLT CONT SHUTOFF TAIL RIGHT
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A
757 MAINTENANCE MANUAL
S 862-092
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.
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