ELECTRICAL SYSTEM SYNOPTIC DISPLAY ELECTRICAL SYSTEM MAINTENANCE DISPLAY
A
A
EICAS Electrical System Displays
Figure 502
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747-400 MAINTENANCE MANUAL
(b) Make sure that all the indicator lights for the electrical system are on.
NOTE: The electrical system indicating lights are on the
____ P5 overhead panel and the P461 overhead maintenance panel.
(c) Set the IND LTS switch to BRT.
S 715-006
(3)
Set the BUS TIE 1, 2, 3, and 4 switches to AUTO.
(a)
Make sure that the ISLN lights are off.
E. Do the Operational Test
S 715-007
(1)
Make sure that the ON lights on the EXT PWR 1 and EXT PWR 2 switches are on.
S 715-008
(2)
Get access to the maintenance page for the electrical system (AMM 45-10-00/201).
S 865-012
(3)
Make sure that the EXT 1, EXT 2 show:
115 | 5 volts ac
400 | 5 Hz frequency.
S 715-009
(4)
Push the ELEC switch on the EICAS display select panel, on the P10 autoflight control panel.
S 865-013
(5)
Make sure that these displays on the synoptic page for the
electrical system show:
(a)
The external power contactors 1 and 2 are closed.
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747-400 MAINTENANCE MANUAL
(b)
The auxiliary power breakers 1 and 2 are open.
(c)
The generator circuit breakers 1, 2, 3, and 4 are open.
(d)
The bus tie breakers 1, 2, 3, and 4 are closed.
(e)
The split system breaker is open.
F.
Put the Airplane Back to the Usual Condition
S 865-010
(1) Remove electrical power from the airplane, if it is not necessary (Ref 24-22-00/201).
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EXTERNAL POWER RECEPTACLE - REMOVAL/INSTALLATION
________________________________________________
1. General_______
A. This procedure has two tasks. One task is the removal of the external power receptacle. The other task is the installation of the external power receptacle.
B. The two external power receptacles (No. 1 - D51, No. 2 - D52) are on the lower right side of the airplane. They are installed aft of the wheel well for the nose gear and forward of the E/E rack.
C. The external power receptacles are part of the pressure seal of the airplane. You must seal them after you install them.
TASK 24-41-03-004-001
2. External Power Receptacle Removal (Fig. 401)_________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
IPC 24-41-03 Fig. 1
(3)
WDM 24-41-13, 24-41-23
(4)
SSM 24-41-01, 24-41-02
B.
Access
(1)
Location Zone 118 Electrical and Electronics Compartment, RH
(2)
Access Panel
118A External Power Receptacle Door
C.
Procedure
(1)
Make sure all electrical power is off (Ref 24-22-00/201)
S 034-003
(2)
Disconnect all electrical power cables from the external power receptacles.
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