(b)  
Release the PSU latch with the rod and open the panel.

 S 024-027
 (3)  Remove the ballast:
 (a)  
Disconnect the electrical cable from the ballast.

 (b)  
Remove the installation screws from the ballast.

 (c)  
Disconnect the ballast electrical bond to ground at the ballast.

 (d)  
Remove the ballast.

 TASK 33-26-05-424-022
 3.  Ballast Installation____________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 32-09-02/201, Air/Ground Relay System

 (3)  
SSM 33-26-01

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747-400
MAINTENANCE MANUAL

 B. Access
 (1)  Location Zone
 200 Upper Half of Fuselage

 C. Ballast Installation
 S 424-028
 (1)  Install the ballast:
 (a)  
Set the ballast in its position.

 (b)  
Connect the electrical bond wire to the ballast.

 (c)  
Install the screws that attach the ballast to the lavatory.

 (d)  
Connect the electrical cable to the ballast.

 (e)  
Close the PSU panel.

 D. Ballast Test
 S 864-032
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-033

 (2)  
Remove each DO-NOT-CLOSE tag.

 (a)  Close each circuit breaker that was opened.
 S 864-037
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO PREPARE
_______ THE SAFETY SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (3)  
Do this task: "Prepare Safety-Sensitive System for Air Mode Simulation" (Ref 32-09-02/201).

 S 864-040

 (4)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  On the overhead circuit breaker panel, P7:
 1) 7F23 LANDING GEAR DSP & CONT ALTN

 S 714-034
 (5)  Close and lock the lavatory door.
 (a) Make sure the fluorescent light changes from dim to bright.
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 (6)  S 864-035Remove the DO-NOT-CLOSE tag. (a) Close the circuit breaker. 1) 7F23 LANDING GEAR DSP & CONT ALTN
 (7)  S 864-036Do this task: "Put Safety-Sensitive Systems Back to the Condition Before Air Mode Simulation" (Ref 32-09-02/201).
 (8)  S 414-043Close the lavatory PSU panel.
 (9)  S 864-020Remove the electrical power if it is not necessary (Ref 24-22-00/201).

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747-400 MAINTENANCE MANUAL
BALLAST
BALLAST
UPPER DECK LAVATORY
(EXAMPLE)

UPPER DECK LAVATORY (EXAMPLE)
Lavatory Lights Ballast Installation Figure 401 (Sheet 1)
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