S 976-043
 (9) Subtract flow No. 7A from flow No. 6A and write this flow as flow
 No. 7B. Flow No. 6A__________GPM Flow No. 7A__________GPM Flow No. 7B__________GPM
 NOTE: Flow No. 7B is the null leakage for the power packages for
____
 the left outboard aileron.

 S 486-044
 (10)
 Install the control wheel adapter and protractor.

 S 866-045

 (11)
 Turn the control wheel counterclockwise 60 to 70 degrees.

 S 976-046

 (12)
 Let the flow become stable for one minute and write this flow as

 flow No. 8. Flow No. 8__________GPM
 S 866-047
 (13)
 Turn the control wheel to the neutral position.

 S 976-048

 (14)
 Subtract flow No. 7 from flow No. 8 and write this flow as flow

 No. 8A.
 Flow No. 8__________GPM
 Flow No. 7__________GPM
 Flow No. 8A__________GPM
 NOTE: Flow No. 8A is the null leakage for the left central-lateral
____
 control package.

 S 976-049
 (15) Subtract flow No. 8A from flow No. 7A and write this flow as flow
 No. 8B. Flow No. 7A__________GPM Flow No. 8A__________GPM Flow No. 8B__________GPM
 NOTE: Flow No. 8B is the null leakage for the power package for
____
 the left inboard aileron.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 866-051
 (16)
 Put the ALTN FLAPS ARM switch in the off position.

 S 086-425

 (17)
 Remove the control wheel adapter and the protractor.

 S 866-052

 (18)
 Release the pressure in hydraulic systems No. 1 and 4 (AMM 29-11-00/201).

 S 086-053

 (19)
 If the system demand pump was used as a pressure source, remove the flowmeter:

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

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

 (c)  
Put the system HYD PUMPS DEMAND switch in the ON position (P5 Overhead Panel).

 (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 leakage from the pressure connection for the demand pump.

 S 086-054
 (20)
 If a hydraulic service cart was used as a pressure source, disconnect the hydraulic service cart:

 (a)  
Disconnect the pressure line of the hydraulic service cart from the system No. 1 and 4 pressure modules.

 (b)  
Disconnect the return line of the hydraulic service cart from the system No. 1 and 4 return modules.

 S 216-484
 (21)
 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).

 S 416-416
 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (22) Close the doors on the trailing edge fairing (AMM 54-62-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 628 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 976-057
 (23) Write the flow values on Fig. 601.  Compare the measured flows to the maximum recommended flows. Replace the applicable components until the total system internal leakage is less than 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 they have too much piston seal leakage.
　
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