S 976-091
(13)
Let this flow become stable for 1 minute and write this flow as flow
No. 5. Flow No. 5__________GPM
S 866-092
(14)
Put the control column in the neutral position.
S 976-093
(15)
Subtract flow No. 5 from flow No. 1 and write this flow as flow
No. 5A. Flow No. 1__________GPM Flow No. 5__________GPM
Flow No. 5A__________GPM
NOTE: Flow No. 5A is the null leakage of the power package for the
____
left inboard-elevator.
S 976-094
(16) Subtract 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 of the control package for
____
the lower rudder.
I. Lateral Hydraulic Control System - Internal Leakage Check
S 866-095
(1)
Put the system No. 2 WING FLT CONTROL SHUTOFF switch in the OFF position.
S 976-096
(2)
Let this flow become stable for 1 minute and write this flow as flow
No. 6. Flow No. 6__________GPM
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 976-097
(3) Subtract flow No. 6 from flow No. 1 and write this flow as flow
No. 6A. Flow No. 1__________GPM Flow No. 6__________GPM
Flow No. 6A__________GPM
NOTE: Flow No. 6A is the null leakage of these controls:
____
-
the left central-lateral control package.
-
the power packages for the right inboard aileron and the left outboard aileron.
-internal leakage other than the null leakage of the control valves in spoiler packages 2, 3, 10, and 11.
S 866-098
(4)
Put the system No. 2 WING FLT CONTROL SHUTOFF switch in the ON position.
S 486-099
(5)
Install the control wheel adapter and protractor.
S 866-100
(6)
Turn the control wheel counterclockwise 30 to 40 degrees.
S 976-101
(7)
Let the flow become stable for one minute and write this flow as
flow No. 7. Flow No. 7__________GPM
S 866-102
(8)
Turn the control wheel to a position 60 to 70 degrees counterclockwise of neutral.
S 976-103
(9)
Let the flow become stable for one minute and write this flow as
flow No. 8. Flow No. 8__________GPM
S 866-104
(10) Put the control wheel in the neutral position.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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MAINTENANCE MANUAL
S 976-105
(11) Subtract flow No. 8 from flow No. 7 and write this flow as flow No. 8A.
Flow No. 7__________GPM
Flow No. 8__________GPM
Flow No. 8A__________GPM
NOTE:____ Flow No. 8A is the null leakage of the power package for the
right inboard aileron.
S 866-107
(12)
Turn the control wheel counterclockwise to 60 to 70 degrees.
S 976-108
(13)
Let the flow become stable for one minute and write this flow as
flow No. 9. Flow No. 9__________GPM
S 866-109
(14)
Put the control wheel in the neutral position.
S 976-110
(15)
Subtract flow No. 9 from flow No. 7 and write this flow as flow
No. 9A. Flow No. 7__________GPM Flow No. 9__________GPM
Flow No. 9A__________GPM
NOTE: Flow No. 9A is the null leakage for the power packages for
____ the right inboard aileron and the left outboard aileron.
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