S 866-130

 (35)
 Release the pressure in hydraulic systems No. 2 and 4 (AMM 29-11-00/201).

 S 086-131

 (36)
 If the system demand pump was used as a pressure source, remove the flowmeter:

 (a)  
Remove the flowmeter from the pressure line on the demand pump.

 (b)  
Connect the pressure line to the pressure port on the demand pump.

 (c)  
Put the system HYD PUMPS DEMAND switch on the P5 overhead panel in the ON position.

 (d)  
Examine the pressure port connection on the demand pump for leakage.

 (e)  
Put the system HYD PUMPS DEMAND switch in the OFF position.

 (f)  
Repair the cause of all leakage from the pressure connection on the demand pump.

 S 086-132
 (37)
 If a hydraulic service cart was used a pressure source, disconnect the hydraulic service cart:

 (a)  
Disconnect the pressure line of the hydraulic service cart from the system No. 2 and 4 pressure modules.

 (b)  
Disconnect the return line of the hydraulic service cart from the system No. 2 and 4 return modules.

 S 216-485
 (38)
 Examine the doors on the trailing edge fairing.

 (a)  
Examine the door latches on the trailing edge fairing for cracks and wear.

 (b)  
Make sure that all latch assemblies are installed.

 (c)  
Repair and adjust the latches if it is necessary
 (AMM 54-62-03/501).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-00
 ALL  ú ú 01 Page 642 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 416-418
 CAUTION:  MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (39) Close the doors on the trailing edge fairing (AMM 54-62-00/201).
 S 096-135
 WARNING:  REFER TO AMM 32-00-30/201 FOR THE REMOVAL PROCEDURE FOR THE LOCKS ON THE LANDING GEAR DOORS. SUDDEN MOVEMENT OF THE DOORS CAN CAUSE DAMAGE AND INJURY.
 (40)
 Remove the locks from the doors on the wing and body gears (AMM 32-00-30/201).

 S 416-136

 (41)
 Close the wing and body gear doors (AMM 32-00-30/201).

 S 976-137

 (42)
 Write the flow values on Fig. 603.  Compare the measured flows to the maximum recommended flows. Replace the applicable components until the total system leakage is less than 5 GPM (or 3 GPM if the system leakage for system 3 is 5 GPM).

 NOTE: If the result of a flow calculation is a negative number, it
____ is possible that the component has a null leakage of a control valve that is more than the recommended flow. Replace these components because of too much piston seal leakage.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-00
 ALL  ú ú 01 Page 643 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

Record Test Flow Data:

Flow No. 1  _________________  Flow No. 8 
Flow No. 2  _________________  Flow No. 9 
Flow No. 3  _________________  Flow No. 10 
Flow No. 4  _________________  Flow No. 11 
Flow No. 5  _________________  Flow No. 12 
Flow No. 6  _________________  Flow No. 13 
Flow No. 7  _________________  Flow No. 14 

Maximum 
Determine Individual Component Leakage Values:_____________________________________________  Actual  Recommended 
___________Flow  _____________Flow 
Flow No. 3, Elevator Feel Computer Null Leakage  3 ______  0.13 GPM 
Flow No. 3A, Stabilizer Pitch Trim Null Leakage 
(No. 2 (No. 3 )) -______ ______  = 3A ______  0.53 GPM 
Flow No. 4A, Left INBD Elevator and Lower Rudder 
　
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