NOTE: Leave the ALTN FLAPS arming switch in the ARM position and
____ the flap control lever in the 10 unit detent for the remainder of hydraulic system No. 4 check.
I. Empennage Hydraulic Control System - Internal Leakage Check
S 866-243
(1)
Put the system No. 4 TAIL FLT CONTROL SHUTOFF switch in the OFF position.
S 976-244
(2)
Let the flow become stable for one minute and write this flow as
flow No. 4. Flow No. 4__________GPM
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A 747-400 MAINTENANCE MANUAL
(3) S 976-245Subtract flow No. 4 from flow No. 3 and write this flow as flow No. 4A. Flow No. 3__________GPM Flow No. 4__________GPM Flow No. 4A__________GPM
NOTE:____ Flow No. 4A is the null leakage for these controls: - power package for the right inboard elevator. - power package for the right outboard elevator. - control package for the lower rudder.
(4) S 866-246Put the system No. 4 TAIL FLT CONTROL SHUTOFF switch in the ON position.
(5) S 866-247Put the control column in the full forward position.
(6) S 976-248Let the flow become stable for one minute and write this flow as flow No. 5. Flow No. 5__________GPM
(7) S 866-249Put the control column in the neutral position.
(8) S 976-250Subtract flow No. 5 from flow No. 3 and write this flow as flow No. 5A. Flow No. 3__________GPM Flow No. 5__________GPM Flow No. 5A__________GPM
NOTE:____ Flow No. 5A is the null leakage of the power packages for the right inboard and outboard elevators.
(9) S 976-251Subtract flow No. 5A from flow No. 4A and write this flow as flow No. 5B. Flow No. 4A__________GPM Flow No. 5A__________GPM Flow No. 5B__________GPM
NOTE:____ Flow No. 5B is the null leakage for the control package of the lower rudder.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
J. Lateral Hydraulic Control System - Internal Leakage Check
S 866-252
(1)
Put the system No. 4 WING FLT CONTROL SHUTOFF switch in the OFF position.
S 976-253
(2)
Let the flow become stable for one minute and write this flow as
flow No. 6. Flow No. 6__________GPM
S 976-457
(3) Subtract flow No. 6 from flow No. 3 and write this flow as flow
No. 6A. Flow No. 3__________GPM Flow No. 6__________GPM
Flow No. 6A__________GPM
NOTE: Flow No. 6A is the null leakage of these controls:
____
-
right central-lateral control package.
-
right inboard-aileron power package.
-
right outboard-aileron power package.
-internal leakage other than the null leakage of the actuators for spoilers 5 and 8.
S 866-255
(4)
Put the system No. 4 WING FLT CONTROL SHUTOFF switch in the ON position.
S 486-256
(5)
Install the control wheel adapter and protractor.
S 866-458
(6)
Turn the control wheel 30 to 40 degrees counterclockwise.
S 866-459
(7)
Put the speedbrake lever in a position 2.75-3.00 inches (7.00 cm-7.60 cm) aft of the full forward position. Measure this distance along an arc at the bottom of the lever.
S 976-257
(8)
Let the flow become stable for one minute and write this flow as
flow No. 7. Flow No. 7__________GPM
S 866-258
(9)
Turn the control wheel 55 to 65 degrees counterclockwise.
(10)
Move the speedbrake lever to the inflight detent.
S 866-460
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