757 AMM 飞机维护手册 液压 CHAPTER 29 - HYDRAULIC POWER 1(126)

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 S 486-192
 (2)  If you use the multimeter technique, do these steps:
 (a)  Do these steps to install the multimeter and the clamp-on ac current probe: 1) Get access to the center system ACMP ELCU M10006 in the P31
 panel.
 WARNING:  BE CAREFUL WHEN YOU INSTALL THE CLAMP-ON AC CURRENT PROBE INTO THE POWER PANEL. THE VOLTAGES IN THE POWER PANEL CAN KILL AND/OR CAUSE DAMAGE TO EQUIPMENT.
 2)  Put the clamp-on ac current probe around one of the three wires which connect to the load side of the ELCU.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

 3) Connect the multimeter to the clamp-on ac current probe.
 WARNING:_______ KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES
 WHEN YOU SUPPLY THE HYDRAULIC POWER.  THE AILERONS,
 ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER
 ARE FULLY POWERED SURFACES.  INJURY TO PERSONS OR DAMAGE
 TO EQUIPMENT CAN OCCUR WHEN YOU SUPPLY THE HYDRAULIC

 POWER.
 (b)  Put the C HYD PUMPS ELEC 1 switch to the ON position.
 S 866-193
 (3)  
Put the A/P ENGAGE C switch on the mode control panel on the P55 panel to CMD, to engage the center system autopilot.

 S 866-194

 (4)  
Put the YAW DAMPER R switch on the P5 panel to the ON position.

 S 866-195

 (5)  
Put the STAB TRIM C hydraulic cutout switch on the P10 panel on the control stand to the NORM position.

 S 866-196

 (6)  
Let the center system operate for at least 15 seconds to let the leakage flow become stable.

 S 976-197

 (7)  
Measure and write the leakage flow.

 NOTE: This is the center system gross neutral leakage flow.
____
 S 976-395
 (8)  
If the system gross leakage is more than 4.0 GPM, you must do the Full Hydraulic System Internal Leakage Check and Isolation of Components with High Leakage procedure.

 S 366-199

 (9)  
Replace the components with high leakage as necessary to decrease the center system gross leakage to less than 4.0 GPM.

 S 866-200

 (10)
 Put the A/P ENGAGE C switch on the mode control panel on the P55 panel to the OFF position.

 (11)
 Push the YAW DAMPER R switch on the P5 panel to the INOP position.
　
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