(2)
SSM 33-51-01
B. Access
(1) Location Zone
200 Upper Half of Fuselage
C. Lamp Replacement
S 862-041
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) On the overhead circuit breaker panel, P7: 1) 7G14, CHG EMER LT
S 962-028
(2) Do these steps to replace the lamp:
(a)
Remove the lens.
(b)
Carefully replace the lamp.
(c)
Install the lens.
S 862-042
(3) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) On the overhead circuit breaker panel, P7: 1) 7G14, CHG EMER LT
D. Lamp Test
S 712-029
CAUTION: KEEP THE OPERATION OF THE EMERGENCY LIGHTS TO LESS THAN A ONE
_______ MINUTE TIME. THE BATTERIES THAT SUPPLY THE ELECTRICAL POWER TO THE EMERGENCY LIGHTS WILL ONLY OPERATE FOR 15 MINUTES WHEN FULLY CHARGED.
(1) On the pilot's overhead panel, P5,
set the EMER LIGHTS switch to the ON position.
(a) Make sure the new lamp comes on correctly.
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747-400
MAINTENANCE MANUAL
ELECTRICAL
CEILING LIGHT
(EXAMPLE)
Ceiling Lights Installation
Figure 201
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E70604
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747-400 MAINTENANCE MANUAL
S 862-030
(2) Set the EMER LIGHTS switch to the OFF position.
(a) Make sure the emergency lights go off.
TASK 33-51-07-002-009
3. Ceiling Light - Removal (Fig. 201)_______________________
A. References
(1)
AIPC 33-51-07
(2)
SSM 33-51-01
B. Access
(1) Location Zone
200 Upper Half of Fuselage
C. Light Assembly Removal
S 862-043
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) On the overhead circuit breaker panel, P7: 1) 7G14, CHG EMER LT
S 862-035
(2) Do these steps to remove the light:
(a)
Open the ceiling panel to get access to the light assembly.
(b)
Disconnect the electrical connectors.
(c)
Remove the screws and remove the light assembly.
TASK 33-51-07-402-015
4. Ceiling Light - Installation (Fig. 201)____________________________
A. References
(1)
AIPC 33-51-07
(2)
SSM 33-51-01
B. Access
(1) Location Zone
200 Upper Half of Fuselage
C. Procedure
S 422-039
(1) Do these steps to install the light:
(a)
Install the light assembly with its screws.
(b)
Connect the electrical connectors.
(c)
Close the ceiling panel.
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747-400 MAINTENANCE MANUAL
S 862-044
(2) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) On the overhead circuit breaker panel, P7:
1) 7G14, CHG EMER LT
D. Light Test
S 712-031
CAUTION: KEEP THE OPERATION OF THE EMERGENCY LIGHTS TO LESS THAN A ONE
_______ MINUTE TIME. THE BATTERIES THAT SUPPLY THE ELECTRICAL POWER TO THE EMERGENCY LIGHTS WILL ONLY OPERATE FOR 15 MINUTES WHEN FULLY CHARGED.
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