S 864-043
(3)
Supply electrical power to the light.
(a) Remove each DO-NOT-OPERATE or DO-NOT-CLOSE tag. 1) Close each circuit breaker that was opened.
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747-400 MAINTENANCE MANUAL
LOWER ANTI-COLLISION LIGHT - MAINTENANCE PRACTICES
__________________________________________________
1. General
_______
A. This procedure contains a task for the replacement of the lamp in the lower anti-collision light.
TASK 33-44-03-962-001
2. Lamp Replacement (Fig. 201)
________________
A. Consumable Materials
(1)
A00247 Sealant - Chromate, BMS 5-95, Class B or C
(2)
G01043 Cloth - Lint Free
B. References
(1)
24-22-00/201, Manual Control
(2)
IPC 33-44-03
(3)
SSM 33-44-01
C. Access
(1) Location Zone
100 Exterior Fuselage - Lower Half
D. Procedure
S 862-018
(1) Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a) P6 Main Power Distribution Panel
1) 6L31 ANTI COLL LTS - RED
S 022-038
WARNING: DO NOT TOUCH THE LIGHT ASSEMBLY FOR 10 MINUTES AFTER YOU REMOVE
_______ POWER. AN ELECTRICAL SHOCK FROM THE HIGH VOLTAGE IN THE LIGHT CAN CAUSE INJURY TO PERSONS.
(2) Do these steps to replace the lamp:
(a)
Remove the lens retaining screws.
(b)
Remove the lens.
(c)
Remove these parts from the light subassembly: 1) The screw.
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747-400
MAINTENANCE MANUAL
LOWER ANTI-COLLISION LIGHT
Lower Anti-Collision Light Lamp Replacement
Figure 201
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747-400 MAINTENANCE MANUAL
2) The lock washer.
3) The reflector.
4) The retaining ring.
(d)
Remove the lamp from the light subassembly.
CAUTION:_______DO NOT LET YOUR FINGERS TOUCH THE LAMP. FINGER OILS ON THE LAMP WILL CAUSE LAMP FAILURE.
(e)
Hold the replacement lamp with a clean dry cloth.
(f)
Push the replacement lamp into the light subassembly.
(g)
Install these parts in the light subassembly:
1) The retaining ring.
2) The reflector.
3) The lock washer.
4) The screw.
(h)
Before you install the lens assembly, use the sealant (BMS 5-95, Class B or C) to apply a seal between the lens assembly and the skin panel (AMM 51-31-01/201).
(i)
Put the lens in its position on the airplane skin.
(j)
Install the lens retaining screws.
S 712-022
(3) Do a test of the light:
(a)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
1) P6 Main Power Distribution Panel
a) 6L31 ANTI COLL LTS - RED
(b)
Supply electrical power (Ref 24-22-00/201).
WARNING: DO NOT LET THE STROBE LIGHT FLASH DIRECTLY IN YOUR EYES.
_______ THE INTENSITY OF THE STROBE LIGHT WILL CAUSE DAMAGE TO YOUR EYES.
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