D. Sign Test
 S 864-039
 (1)
Supply electrical power (AMM 24-22-00/201).

 S 864-040

 (2)
Remove each DO-NOT-OPERATE tag.

 (a)
Close each circuit breaker that was opened.

 (b)
Make sure the LOCK DOOR sign comes on correctly.

 S 714-041
 (3) Close and lock the lavatory door.
 (a) Make sure the LOCK DOOR sign goes off.
 S 864-042
 (4) Remove electrical power if it is not necessary (AMM 24-22-00/201).
 TASK 33-26-07-004-018
 4. RETURN TO SEAT Sign - Removal (Fig. 401)
_____________________________
 A. References
 (1) SSM 33-26-01 thru 33-26-02
 B. Access
 (1)  Location Zone
 200 Upper Half of Fuselage

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A
747-400 MAINTENANCE MANUAL
 C.  Sign Removal
 S 864-043
 (1)  Remove electrical power from the sign:
 (a)  Open each applicable circuit breaker and attach the DO-NOT-CLOSE tag: 1) On the power distribution center panel, P414.
 S 014-020
 (2)  Remove the mirror from the lavatory wall:
 (a)  
If the mirror has one part, do these steps: 1) Remove the screws from the bottom of the retainers. 2) Lift the mirror assembly up and remove it from the mounting

 bracket.

 (b)  
If the mirror has two parts, do these steps:

 1)  Push the button to release the mirror, and open the mirror segment attached by a hinge: a) Remove the fasteners from the mirror. b) Remove the mirror from the wall. c) Remove the screws from the bottom of the mirror
 retainer. 2) Lift the mirror assembly up and remove it from the mounting bracket.
 S 034-021
 (3)  
Remove the two screws from the sign assembly.

 (4)
Disconnect the electrical wires from the sign assembly terminals.

 (5)  
Remove the sign assembly.

 S 034-022
 S 024-023
 TASK 33-26-07-404-024
 5.  RETURN TO SEAT Sign - Installation (Fig. 401)
__________________________________
 A.  References
 (1)  AMM 24-22-00/201, Manual Control
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747-400
MAINTENANCE MANUAL

 (2)  SSM 33-26-01 thru 33-26-02
 B. Access
 (1)  Location Zone
 200 Upper Half of Fuselage

 C. Sign Installation
 S 434-025
 (1)  
Connect the electrical wires to the sign assembly.

 S 424-026

 (2)  
Put the sign assembly in its position.

 S 434-027

 (3)  
Install the sign assembly fasteners.

 S 414-028

 (4)  
Install the mirror on the wall:

 (a)  
If the mirror has one part, do these steps: 1) Put the mirror in its position. 2) Install the screws into the bottom of the mirror retainer

 at the lower edge of the mirror.

 (b)  
If the mirror has two parts, do these steps: 1) Put the mirror in its position. 2) Install the screws into the bottom of the mirror retainer

 at the lower edge of the mirror assembly. 3) Install the mirror segment attached by a hinge. 4) Install the fastener in the mirror segment attached by a
 hinge.
 5) Close the mirror.

 D. Sign Test
 S 864-044
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-045

 (2)  
Remove each DO-NOT-CLOSE tag and close each circuit breaker that was opened.

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