S 862-036
(3)
Make sure that these circuit breakers are open and DO-NOT-CLOSE tags are attached:
(a)
P6, Main Power Distribution Panel
1) 6J24, RUD/ELEV SENSOR
2) 6J25, RUD/ELEV IND
(b)
P7, Overhead Circuit Breaker Panel
1) 7D7, FLT CONT CMPTR SERVO L
2) 7D8, FLT CONT CMPTR PWR L
3) 7D12, FLT CONT CMPTR SERVO C
4) 7D13, FLT CONT CMPTR PWR C
5) 7D14, FLT CONT CMPTR SERVO R
6) 7D15, FLT CONT CMPTR PWR R
S 012-037
(4) Make sure that you remove the access panels 324EL, 324FL, and 324FR (optional)(AMM 06-09-07/201).
F. RPCP Electrohydraulic Servovalve and Solenoid Valve Installation
S 432-038
CAUTION: DO NOT LET HYDRAULIC FLUID GET INTO THE ELECTRICAL CONNECTOR.
_______ THE HYDRAULIC FLUID CAN CAUSE DAMAGE AND FAILURE TO THE ELECTRICAL CONNECTOR.
(1)
Remove the covers from the hydraulic ports on the RPCP.
S 162-039
(2)
Clean the surfaces of the valve gasket plate and the RPCP with the clean hydraulic fluid.
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MAINTENANCE MANUAL
S 432-040
(3)
Remove the cover from the electrical port.
S 642-041
(4)
Lightly lubricate the new gasket plate and the O-ring with the MCS352 lubricant.
S 432-042
(5)
Install the new O-ring with the O-ring installation tool (AMM 20-11-19/401).
S 642-043
(6)
Lightly lubricate the mounting screws with the MIL G-23827 grease.
S 422-061
(7)
Install the valve and gasket plate on the RPCP with the mounting screws and washers.
(a) Tighten the mounting screws from 70 to 80 pound-inches.
S 762-045
(8)
Use the bonding meter to make sure that the resistance between the valve and RPCP is 5.0 milliohms (0.005 ohm) or less (AMM 20-22-01/601).
S 432-046
(9)
Install the lockwire on the mounting screws (AMM 20-11-28/401).
TASK 22-13-05-702-065
4. Electrohydraulic Servovalve and Solenoid Valve Test
___________________________________________________
A. References
(1)
AMM 06-09-07/201, Fin and Rudder Access Doors and Panels
(2)
AMM 21-58-00/501, Electrical/Electronic Equipment Cooling System
(3)
AMM 22-10-00/501, Autopilot/Flight Director System
(4)
AMM 24-22-00/201, Manual Control
(5)
AMM 29-11-00/201, Main Hydrualic Supply System
(6)
AMM 34-21-00/501, Inertial Reference System
B. Access
(1) Location Zones
121 Control Cabin - LH
122 Control Cabin - RH
C. Prepare for the RPCP Electrohydraulic Servovalve and Solenoid Valve Test
S 862-056
(1) Supply electrical power (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
S 862-057
(2) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6, Main Power Distribution Panel
1) 6H24, RUD/ELEV SENSOR
2) 6H25, RUD/ELEV IND
(b)
P7, Overhead Circuit Breaker Panel
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