S 866-278
(29)
Let the flow become stable for one minute and write this flow as
flow No. 12. Flow No. 12__________GPM
S 866-279
(30)
Put the speedbrake lever in the full aft position.
S 866-465
(31)
Turn the control wheel 30 to 40 degrees clockwise of the neutral position.
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747-400
MAINTENANCE MANUAL
S 976-280
(32) Let the flow become stable for one minute and write this flow as
flow No. 13. Flow No. 13__________GPM
S 866-281
(33)
Put the control wheel in the neutral position.
S 976-282
(34)
Subtract flow No. 13 from flow No. 12 and write this flow as flow No. 13A.
Flow No. 12__________GPM
Flow No. 13__________GPM
Flow No. 13A__________GPM
NOTE:____ Flow No. 13A is the internal leakage other than the null
leakage of the control valve for spoiler package No. 8.
S 976-283
(35) Add flow No. 9B, flow No. 11A, and flow No. 13A. Write this flow as flow No. 13B.
Flow No. 9B__________GPM Flow No. 11A__________GPM Flow No. 13A__________GPM Flow No. 13B__________GPM
S 976-284
(36) Subtract flow No. 13B from flow No. 6A and write this flow as flow No. 13C.
Flow No. 6A__________GPM Flow No. 13B__________GPM Flow No. 13C__________GPM
NOTE: Flow No. 13C is the null leakage of the control package
____ for the right central lateral control.
S 866-285
(37) Put the speedbrake lever in the full forward position.
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747-400 MAINTENANCE MANUAL
S 866-676
WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL
MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP
CONTROL LEVER.
(38)
Retract the trailing edge flaps (AMM 27-51-00/201).
S 866-288
(39)
Put the ALT FLAPS arming switch in the off position.
S 086-289
(40)
Remove the control wheel protractor and adapter.
S 866-290
(41)
Release the pressure in hydraulic system No. 4 (AMM 29-11-00/201).
S 086-291
(42)
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 any leakage from the pressure connection on the demand pump.
S 086-292
(43)
If a hydraulic service cart was used a pressure source, disconnect the hydraulic service cart:
(a)
Disconnect the pressure line on the hydraulic service cart from the system No. 4 pressure module.
(b)
Disconnect the return line on the hydraulic service cart from the system No. 4 return module.
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