BUS POWER CONTROL UNIT - REMOVAL/INSTALLATION
_____________________________________________
1. General________
A. The bus power control unit (referred to as the BPCU) is on shelf 3 of the E5 equipment rack in the main equipment center.
B. The bus power control unit (referred to as the BPCU) divides external power between the airplane buses. When the BPCU is removed or installed external power cannot be connected to either main ac bus, the ground service bus, or the ground handling bus (external power may remain connected at the external power receptacle). The main engine generators can supply power to their related buses. The bus tie breakers must stay in the open position. With the bus tie breakers open, the APU generator cannot supply power to either main ac bus and the main generators cannot supply power to the opposite ac bus.
TASK 24-41-03-004-001
2. Remove the Bus Power Control Unit_________________________________
A. References
(1)
AMM 20-10-01/401, E/E Rack Mounted Components
(2)
AMM 20-41-01/201, Electrostatic Discharge Sensitive Devices
(3)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
B. Access
(1)
Location Zone
119/120 Main equipment center
(2)
Access Panel
119AL Main equipment center access
121 Forward Cargo Compartment, left
C. Prepare for Removal
S 864-005
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
_______ HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZERS ARE FULLY POWERED SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
(1)
Do the deactivation procedure for the spoilers (AMM 27-61-00/201) or move all persons and equipment away from the spoilers.
S 864-002
(2)
Open this circuit breaker on the main power distribution panel (referred to as the P6 panel) and attach a DO-NOT-CLOSE tag:
(a) 6B4, BUS PWR CONT UNIT
S 864-003
(3) Open this circuit breaker on the overhead circuit breaker panel (referred to as the P11 panel) and attach a DO-NOT-CLOSE tag:
(a) 11R32, BPCU SEC
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
S 864-004
(4) Open this circuit breaker on the APU/external power panel (referred to as the P34 panel) and attach a DO-NOT-CLOSE tag:
(a) 34B2, GROUND POWER BPCU
D. Remove the BPCU
S 914-018
CAUTION: DO NOT TOUCH THE BPCU BEFORE YOU DO THE PROCEDURE FOR DEVICES
_______ THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE BPCU.
(1)
Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-01/201).
S 024-007
(2)
Remove the BPCU (AMM 20-10-01/401).
TASK 24-41-03-404-008
3. Install the Bus Power Control Unit
__________________________________
A. References
(1)
AMM 20-10-01/401, E/E Rack Mounted Components
(2)
AMM 20-41-01/201, Electrostatic Discharge Sensitive Devices
(3)
AMM 24-22-00/201, Electrical Power - Control
(4)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
B. Access
(1)
Location Zones
119/120 Main equipment center
211/212 Flight Compartment
(2)
Access Panel
119AL Main equipment center access
C. Install the BPCU
S 914-009
CAUTION: DO NOT TOUCH THE BPCU BEFORE YOU DO THE PROCEDURE FOR DEVICES
_______ THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN DAMAGE THE BPCU.
(1)
Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-01/201).
(2)
Install the BPCU (AMM 20-10-01/401).
S 864-011
(3)
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P34 panel:
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