S 792-017
(6)
Examine the hydraulic connections of the power control package for leaks.
S 722-018
(7)
Make sure the aileron moves from neutral to the full up or full down position in approximately 1 second.
(a)
If there is no change on the adjustment of the input control rod, dimension checks are not necessary.
(b)
Do this task if there is a change on the adjustment of the input control rod: "Aileron and Aileron Trim Control System Adjustment" (Ref 27-11-00/501).
G.
Put the Airplane Back to Its Usual Condition
S 862-019
(1)
Do this task: "Hydraulic System Depressurization"
(Ref 29-11-00/201).
S 862-020
(2)
Do this task if electrical power is not necessary: "Electrical Power Removal" (Ref 24-22-00/201).
S 412-021
(3)
Close the access panels (Ref 06-09-08/201).
S 612-022
(4)
Do this task: "Hydraulic Reservoir Servicing" (Ref 12-12-01/301).
TASK 27-11-12-002-023
4. Inboard Aileron Power Control Package Compensator Removal_________________________________________________________
A. References
(1)
06-09-08/201, Wing Access Doors and Panels
(2)
24-22-00/201, Manual Control (Apply Power)
(3)
29-11-00/201, Main Hydraulic Supply System
(4)
IPC 27-11-12, Fig. 5
B.
Access
(1)
Location Zone
579 Inboard Aileron, LH
679 Inboard Aileron, RH
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A
747-400
MAINTENANCE MANUAL
(2)
Access Panel
573CB Hydraulic, LH
573AB Inboard Aileron Actuator, LH
573BB Inboard Aileron Actuator, LH
673CB Hydraulic, RH
673AB Inboard Aileron Actuator, RH
673BB Inboard Aileron Actuator, RH
C.
Prepare for Removal
S 862-024
(1)
Do this task: "Supply Electrical Power" (Ref 24-22-00/201).
S 862-025
(2)
Set the FLT CONTROL HYD POWER - WING VALVE switches No. 1, 2, 3 and 4 on the P461 Pilots' Overhead Maintenance Panel to SHUTOFF.
S 862-027
(3)
For the applicable system, open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P180 DC Power Distribution Panel
1) 180H7 LATERAL CONT VALV SYS 1
2) 180E6 LATERAL CONT VALV SYS 2
3) 180H22 LATERAL CONT VALV SYS 3
4) 180E21 LATERAL CONT VALV SYS 4
S 862-028
(4)
Do this task: "Hydraulic System Depressurization"
(Ref 29-11-00/201).
S 012-029
(5)
Open the access panels of the hydraulic (573CB - left wing, 673CB -right) and the power control package (573AB and 573BB - left wing, 673AB and 673BB - right) in the lower surface of the wing, forward of the aileron (AMM 06-09-08/201).
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A
747-400 MAINTENANCE MANUAL
D. Procedure
S 022-030
(1)
Remove the compensator (Fig. 201):
(a)
Put a container below the power control package to catch fluid leakage.
(b)
Remove the screws (49) and washers (50).
(c)
Remove the compensator (16) from the power control package (Section C-C).
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