(a) To reduce electrical power system loads, power is removed from C2 ACMP when all the following conditions are met: 1) The C2 ACMP select switch on the hydraulic control panel is
on.
2) The C1 ACMP select switch on the hydraulic control panel is on and the pump is operating (electrical load control unit M10006 is energized).
3) The left and right bus tie breakers (BTBs) are both closed.
(b) The two closed BTBs indicate that a single source is supplying all ac electrical power. If a second source comes on line, the BTBs will open to isolate the sources. This will return power to the C2 ACMP. If only one BTB is open the C2 ACMP will not be shed. If the C1 ACMP is off, the C2 ACMP will not be shed.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
FAULT ISOLATION/MAINT MANUAL
MAIN (LEFT,RIGHT, AND CENTER) HYDRAULIC SYSTEMS
COMPONENT FIG. 102 SHT QTY ACCESS/AREA REFERENCE
CIRCUIT BREAKERS 1 FLIGHT COMPARTMENT, P6 PANEL
HYD EMP ENABLE C1, C4329 1 6K13 *
HYD EMP ENABLE R, C4330 1 6K14 *
HYD EMP ENABLE C2, C4331 1 6K19 *
CIRCUIT BREAKERS 1 FLIGHT COMPARTMENT, P11 PANEL
ELEC PUMP C1, C4043 1 11K15 *
ELEC PUMP C2, C4014 1 11K24 *
ELEC PUMP LEFT, C4045 1 11K25 *
ELEC PUMP RIGHT, C4044 1 11K16 *
HYDRAULICS ENG PUMP SUPPLY L, C4023 1 11D28 *
HYDRAULICS ENG PUMP SUPPLY R, C4025 1 11D29 *
HYDRAULICS QTY CENTER, C4192 1 11K19 *
HYDRAULICS QTY LEFT, C1101 1 11K20 *
HYDRAULICS QTY RIGHT, C4193 1 11K21 *
RESERVE BRAKE SOURCE, C4292 1 11K22 *
L ENG PUMP DEPRESS, C4024 1 11K14 *
R ENG PUMP DEPRESS, C4026 1 11K23 *
SYSTEM PRESS CENTER, C1082 1 11K18 *
SYSTEM PRESS LEFT, C1034 1 11K17 *
CIRCUIT BREAKERS - (REF 31-01-31, FIG. 101) LEFT BUS TIE, C902 CIRCUIT BREAKERS - (REF 31-01-32, FIG. 101) RIGHT BUS TIE, C904 COMPUTER - (REF 31-41-00, FIG. 101) EICAS L, M10181 EICAS R, M10182 SYSTEM PRESS RIGHT, C1081 1 11K26 *
* SEE THE WDM EQUIPMENT LIST
Main (Left,Right, and Center) Hydraulic Systems - Component Index
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