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747-400 MAINTENANCE MANUAL
(d)
Make sure the strobe light is on.
(e)
Put the STROBE switch on the P5 panel to OFF.
(f)
Make sure the strobe lights are off.
F. Put the airplane back to its usual condition
S 862-023
(1)
Remove the DO-NOT-OPERATE tag from the APU START switch on the P5 panel.
S 862-024
(2)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a) P83 Aft APU Equipment Control and Circuit Breaker Panel 1) C8816 APU START
S 862-025
(3) Remove electrical power if it is not necessary
(Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
TAIL ANTI-COLLISION LIGHT POWER SUPPLY - REMOVAL/INSTALLATION
_____________________________________________________________
1. General_______
A. This procedure contains these tasks:
(1)
A task for the removal of the power supply.
(2)
A task for the installation of the power supply.
TASK 33-44-08-004-001
2. Removal (Tail Anti-Collision Light Power Supply) (Fig. 401)________________________________________________
A. References
(1)
IPC 33-44-08 Fig. 1
(2)
SSM 33-44-02
B. Access
(1) Location Zone
300 Tail Cone
C. Procedure
S 864-028
(1) Do these steps to prepare for the removal:
WARNING: DO NOT TOUCH THE POWER SUPPLY FOR 10 MINUTES AFTER YOU
_______ REMOVE POWER. AN ELECTRICAL SHOCK FROM THE HIGH VOLTAGE IN THE POWER SUPPLY CAN CAUSE INJURY TO PERSONS.
(a) Open this circuit breaker and attach a DO-NOT-CLOSE tag:
1) P6 Main Power Distribution Panel a) 6L32 ANTI COLL LTS WHITE
WARNING:_______MAKE SURE THE APU IS OFF. THE APU MUST BE OFF TO PREVENT INJURY TO PERSONS AT THE TAIL CONE AREA.
(b)
Put the APU switch to STOP and attach a DO-NOT-OPERATE tag.
(c)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
1) P83 panel a) APU PRIMARY CONTROL
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SEE A
1. POWER SUPPLY
3. HEX NUT
2. BONDING JUMPER
4. ELECTRICAL
CABLES
(2 LOCATIONS)
5. MOUNTING SCREWS
6. MOUNTING BRACKET
A
Tail Strobe Light Power Supply Installation
Figure 401
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747-400 MAINTENANCE MANUAL
2) P6 Main Power Distribution Panel a) 6F15 A/APU - ENG START - PERF SOL PWR
S 024-029
(2) Do these steps to remove the power supply:
(a)
Open the APU access doors and install the support rods.
(b)
Remove the safety wire from the electrical connectors.
(c)
Disconnect the electrical connectors (4) from the power supply (1).
(d)
Remove the nut (3) and disconnect the ground wire (2) from the power supply (1).
(e)
Remove the mounting screws (5) from the power supply (1).
(f)
Remove the power supply (1).
TASK 33-44-08-404-012
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