29-11-00
ALL ú ú 05 Page 680N ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
~........................................................................
| | SYS 1 *[1] | SYS 2 *[1] | SYS 3 *[1] | SYS 4 *[1] |
..........................................................................
| SYS | | LEFT OUTBOARD | LEFT INBOARD | BRAKE |
| 1 | ---| AILERON PCP | AILERON PCP | ANTISKID |
| *[2] | | OR LEFT CLCP | | SHUTTLE |
| | | | | VALVES *[3] |
.......................................................................... | SYS | LEFT OUTBOARD | | | RIGHT INBOARD | | 2 | AILERON OR | ---| ---| AILERON PCP OR| | *[2] | LEFT CLCP | | | BRAKE ANTISKID| | | | | | SHUTTLE | | | | | | VALVES *[3] | .......................................................................... | SYS | LEFT INBOARD | | | RIGHT OUTBOARD| | 3 | AILERON PCP | ---| ---| AILERON PCP | | *[2] | | | | OR RIGHT CLCP | .......................................................................... | SYS | BRAKE | RIGHT INBOARD | RIGHT OUTBOARD| | | 4 | ANTISKID | AILERON PCP | AILERON PCP | ---| | *[2] | SHUTTLE | OR BRAKE | OR RIGHT CLCP | | | | VALVES *[3] | ANTISKID | | | | | | SHUTTLE | | | | | | VALVES *[3] | | | 2........…...............…...............…...............…...............1 *[1] The system must not be pressurized. *[2] The system must be pressurized. *[3] For the brake antiskid shuttle valves, brake operation or a large
difference in the reservoir pressures is necessary for movement of the fluid between the systems.
S 796-694
(5)
Do a check of the components of the empennage flight controls.
(a)
Find the switches for the FLT CONTROL HYD POWER on the pilot's overhead maintenance panel, P461. 1) Put the WING switches, for the hydraulic systems No. 1, 2,
3, and 4, to the SHUTOFF position. a) Make sure the VALVE CLOSED lights for the four switches come on. 2) Put the TAIL switches, for the hydraulic systems No. 1, 2,
3, and 4, to the NORM position.
a) Make sure the VALVE CLOSED lights for the four switches
are off.
(b) Monitor the hydraulic quantity indication, on the EICAS status display, for the conditions which follow: 1) The quantity of the hydraulic fluid increases in one or
more of the three systems which are not pressurized. 2) The quantity of the hydraulic fluid decreases in the system which is pressurized.
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ALL ú ú 02 Page 680O ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(c) Refer to the chart which follows, for the possible sources of the movement of the fluid between the hydraulic systems. 1) These are the applicable conditions for the chart which
follows: a) The supply shutoff valves for the aileron and spoilers must be in the closed position. b) The supply shutoff valves for the rudder and elevator must be in the open position. c) The systems which are identified with the flagnote *[1] must not be pressurized. d) The systems which are identified with the flagnote *[2] must be pressurized.
e) *[3] For the brake antiskid shuttle valves, brake operation or a large difference in the reservoir pressures is necessary for movement of the fluid between the systems.
~........................................................................ | | SYS 1 *[1] | SYS 2 *[1] | SYS 3 *[1] | SYS 4 *[1] | ..........................................................................
| SYS | | LEFT INBOARD | UPPER RUDDER | BRAKE |
| 1 | --- | ELEVATOR PCP | PCP | ANTISKID |
| *[2] | | | | SHUTTLE |
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