(b)
Remove the two bolts, washers and nuts from the lower mount bracket for the SCU on Flange B2.
(c)
Remove the two bolts, washers and nuts from the upper mount bracket for the SCU on Flange B2.
(d)
Have another person very carefully hold the SCU, and remove the two bolts, washers and nuts from the upper mount bracket on Flange A1.
(e)
Remove the SCU with the mount brackets from the fan case.
S 422-004-N00
(3)
Install the SCU to the flight position on the right side of the engine:
(a)
Remove the protection covers from the electrical connectors on the SCU.
(b)
If the SCU has the multiplexing option, remove the protection cover from the adapter which is located near the data plate.
(c)
With the electrical connectors on the SCU positioned rearward, install the SCU to the right side of the fan case at a location below the smaller connectors of the W1 and W2 harnesses located across Flanges A1 and B2 at the 2:30 o'clock position. 1) Put the forward mount brackets to the rear of Flange A1 and
the rear mount brackets to the rear of Flange B2.
2) Align the top bolt hole of the upper rear mount bracket with the lower bolt hole of the attached bracket and the bolt hole in the flange.
(d) Align the bolt holes in the mount brackets with the bolt holes in the flanges and attach the brackets to the flanges with the bolts, threads lubricated with engine oil, washers and nuts. 1) Tighten the bolts to 85-95 pound-inches (9.6-10.7
newton-meters).
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747-400
MAINTENANCE MANUAL
SEE A
FLANGE B2
FLANGE A1
DATA PLATE
SCU
A
L-A6027
Supplemental Control Unit (SCU) at Storage Location Figure 201
H90579
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747-400
MAINTENANCE MANUAL
FLANGE B2
W1 CONNECTOR
FLANGE A1
SEE A BOLT HOLES
W1 CONNECTOR
SEE B
BOLT HOLES
BOLT HOLES
ATTACHED
BRACKET
FLEX HOSE WITH MULTIPLEX OPTION
BOLT HOLES
A
B L-A6028
Flight Location on the Fan Case for Supplemental Control Unit (SCU)
Figure 202
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A 747-400 MAINTENANCE MANUAL
1. BOLT
W1 CABLE 2. CUSHIONED CLAMP
11. BOLT ASEE 12. CUSHIONED W2 CABLE CLAMP SEE C B SEE BRACKET MOUNT B
SCU
MOUNT BRACKET (TAB) A
C 9. WIRING HARNESS 10. WIRING HARNESS CONNECTOR (W2P33) CONNECTOR (W2P34) A 1
A
6. BOLT 7. WASHER 8. NUT
5. GROUND CABLE
LANYARD
4. MOUNT BOLTS (4 LOCATIONS) 3. FLEX HOSE ASSEMBLY 2
2 1 SCU WITHOUT MULTIPLEXING OPTION SCU WITH MUUTIPLEXING OPTION A-A L-A6029
Supplemental Control Unit (SCU) at Flight Location
Figure 203
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747-400
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