(2)
Access Panel
P714 Aux/Ext No. 1 Power Center
C.
Procedure
(1)
Make sure that the electrical power is off (Ref 24-22-00/201).
(2)
Open the P714 panel access door.
S 864-003
S 014-005
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A
747-400
MAINTENANCE MANUAL
GROUND GROUND SERVICE
HANDLING TRANSFER RELAY,
RELAY 1, R15
R117 SEE C
SEE B
GROUND GROUND SERVICE
HANDLING BUS UTILITY
RELAY 2, TRANSFER RELAY,
R118SEE A SEE B
R1169
SEE C
GROUND SERVICE BUS UTILITY SELECT RELAY, GROUNDR1168
SERVICE SEE C
SELECT RELAY, R14
SEE C
P714 AUX/EXT
A
GROUND HANDLINGRELAY (TYPICAL) GROUND SERVICE RELAY (TYPICAL)
B
NOTE: TERMINAL LEADS NOT
C
SHOWN FOR CLARITY.
Ground Handling and Ground Service Relay Installation
Figure 401
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A
747-400 MAINTENANCE MANUAL
S 034-028
(3)
Disconnect the top electrical cables from the relay:
(a)
Remove the screws that attach the top terminal cover to the relay.
(b)
Remove the top terminal cover.
(c)
Attach an identification tag to each top terminal cable.
(d)
Remove the nuts and washers that attach the top terminal cables to the relay.
(e)
Disconnect the top terminal cables from the relay.
S 034-031
(4)
Disconnect the lower electrical cables from the relay:
(a)
Remove the screws that attach the lower terminal cover to the relay.
(b)
Remove the lower terminal cover.
(c)
Attach identification tags to each lower terminal cable.
(d)
Remove the nuts and washers that attach the lower terminal cables to the relay.
(e)
Disconnect the lower terminal cables from the relay.
S 024-009
(5)
Remove the relay:
(a)
Remove the four screws that attach the relay to the panel.
(b)
Remove the relay from the panel.
(c)
Install the terminal washers, the terminal nuts, and the terminal covers on the relay.
TASK 24-51-01-404-014
3. Ground Handling or Ground Service Select Relay Installation (Fig. 401)___________________________________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
45-10-00/201, Central Maintenance Computer System
(3)
IPC 24-22-60 Fig. 1
(4)
IPC 24-51-60 Fig. 3
(5)
WDM 24-22-61, 24-51-61, 24-51-71
(6)
SSM 24-22-06, 24-51-08
B.
Access
(1)
Location Zone 118 Electrical and Electronics Compartment, RH
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747-400 MAINTENANCE MANUAL
(2) Access Panel
P714 Aux/Ext No. 1 Power Center
C. Install the Ground Handling Relay or the Ground Service Select Relay
S 424-029
(1)
Install the relay:
(a)
Put the relay in its position on the P714 panel.
(b)
Install the four screws that attach the relay to the panel.
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