(2)
AMM 20-11-22/401, E/E Rack Mounted Components
(3)
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices
(4)
AMM 24-22-00/201, Manual Control
(5)
AMM 45-10-00/201, Central Maintenance Computer System
(6)
AIPC 32-42-01, Fig. 1
B.
Access
(1)
Location Zone
125 Area Below Forward Cargo Container Compartment, LH (Brake System Control Unit location is at the center of the Equipment Center, E-9 Rack)
(2)
Access Panel
125B Access Electronics
C.
Shop Faults Recording Procedure (Optional)
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-002
(2)
Get to the SHOP FAULTS menu on the Control Display Unit (CDU) on the pilot's control stand panel, P8 (AMM 45-10-00/201).
S 864-001
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747-400 MAINTENANCE MANUAL
S 974-003
(3) Do the steps that follow to make a record of the shop faults for the brake system control unit (BSCU):
(a) Set 32 BRAKE CONTROL from the shop faults menu.
(b) Set the BSCU option from the menu for the BSCU.
(c) Make a record of all the shop faults that are shown.
S 864-004
(4) Remove electrical power if it is not necessary (AMM 24-22-00/201).
D. Remove the BSCU (Fig. 401)
S 864-008
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P180, DC Power Distribution Panel
1) 180J07, ANTI SKID 1-3
2) 180F07, ANTI SKID 2-4
3) 180J22, ANTI SKID 5-7
4) 180F22, ANTI SKID 6-8
5) 180F23, ANTI SKID 9-11
6) 180J23, ANTI SKID 10-12
7) 180F08, ANTI SKID 13-15
8) 180J08, ANTI SKID 14-16
9) 180J25, AUTO BRK
10) 180J09, TORQUE LIMIT 1-5, 9-13
11) 180F09, TORQUE LIMIT 2-6, 10-14
12) 180J24, TORQUE LIMIT 3-7, 11-15
13) 180F24, TORQUE LIMIT 4-8, 12-16
14) 180F25, BRK CONT IND/TEST 1
15) 180F10, BRK CONT IND/TEST 2
S 024-005
(2) Do the steps that follow to remove the BSCU:
(a) Open access door 125B, on the bottom of the airplane fuselage, to get access to the E-9 shelf (AMM 06-09-02/201).
CAUTION: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO
_______ REMOVE THE BSCU. A FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE DAMAGE TO THE EQUIPMENT.
(b) Do this task before you remove the BSCU from the E-9 shelf: "ESDS Metal Encased Units - Removal" (AMM 20-41-02/201).
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747-400
MAINTENANCE MANUAL
BRAKE
SYSTEM A
CONTROL
UNIT
(BSCU)
SEE A
BRAKE
INDICATION
DISABLE
SWITCH
A
BRAKE SYSTEM CONTROL UNIT (BSCU)
A
BRAKE CONTROL UNIT :
PART NO. 42-747 DATE MFD
BOEING PN S283U002- SERNO
BRAKE INDICATION
CRANE BURBANK, CALIFORNIA 91510 HYDRO-AIRE DIVISION DISABLE
7 8 9
6 10
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