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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (9)  
Return fluid from the actuator chambers passes via the main control valve to a compensator, which it charges to capacity if required. Pressure buildup then opens a check valve in the compensator piston, allowing the fluid to exit through the return port. The compensator retains a reserve of pressurized return fluid to ensure proper operation of check valves within the package. Two anticavitation valves are provided in each system. These valves permit fluid flow from the return system to the actuator service ducts of the unpressurized actuator chambers if the packages are operated with one hydraulic system unpressurized.

 (10)
 In the auto flight mode, electrical signals generated by the autopilot pitch channels operate the elevator autopilot servo modules. Inputs are then conveyed to the elevator aft torque tube thru control rods, and to the inboard elevator PCP control valve linkages via the inboard elevator PCP control valve linkages. See 22-12-00/001 for operation of the elevator autopilot servo modules.

 B.
Manual Control Operation

 (1)  
Provide electrical power (Ref 24-22-00/201).

 WARNING: AILERONS, ELEVATORS, RUDDERS, TRAILING EDGE FLAPS AND SPOILERS
_______ ARE FULLY POWERED. ENSURE PERSONNEL AND EQUIPMENT ARE CLEAR OF ALL CONTROL SURFACES BEFORE PROVIDING HYDRAULIC POWER. ELEVATORS WILL MOVE RAPIDLY TOWARDS NEUTRAL.
 (2)  
Pressurize the hydraulic systems No. 1, 2, 3 and 4
 (Ref 29-11-00/201).

 (3)  
Deflect elevators upwards by pulling aft on either control column.

 NOTE: Force required to displace control columns increases
____ progressively as amount of displacement from neutral detent increases in either direction.
 (4)  Return elevators to neutral by allowing control columns to return to neutral detent.
 NOTE: Elevators may not return completely to neutral without the
____
 pitot system being pressurized.

 (5)  
Deflect elevators downwards by pushing forward on either control column.

 (6)  
Return elevators to neutral by allowing control columns to return to neutral detent.

 NOTE: Elevators may not return completely to neutral without the
____
 pitot system being pressurized.

 (7)  
Release pressure in the hydraulic systems No. 1, 2, 3 and 4 if no longer required (Ref 29-11-00/201).

 (8)  
Remove electrical power if no longer required (Ref 24-22-00/201).

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 27-31-00
 ALL  ú ú 03 Page 12 ú Jun 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 C. Autopilot Control Operation
 (1)  For autopilot operation, refer to 22-10-00/001 for elevator control in the auto flight mode.
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 27-31-00
 ALL  ú ú 03 Page 13 ú Jun 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 ELEVATOR CONTROL SYSTEM - MAINTENANCE PRACTICES
_______________________________________________
 1.  General_______
 A.  This subject has one task. The task is to drain the unwanted fluid from the hydraulic standpipe assemblies. The procedure has these parts:
 (1)  
The removal of the cap

 (2)  
The drainage of the unwanted fluid from the hydraulic standpipe assemblies

 (3)  
The replacement of the cap

 (4)  
A check of the standpipe assembly for hydraulic leaks

 (5)  
The drainage of the unwanted fluid again for other standpipe assembly.

 TASK 27-31-00-682-001
 2.  Hydraulic Standpipe Assemblies Drainage_______________________________________
 A.  Equipment
 (1)  
Open top container, 1/2 gallon or larger.

 B.  
References

 (1)  
06-09-05/201, Body Section 48 Access Doors and Panels
　
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