PASSENGER INFORMATION SIGN

ELECTRICAL WIRES
Passenger Information Signs Installation
Figure 401 (Sheet 2)

 F01137
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747-400 MAINTENANCE MANUAL
 S 024-005
 (4)  Remove the sign.
 TASK 33-24-03-404-039
 3.  Install Passenger Information Sign (Fig. 401)__________________________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
IPC 33-24-03

 (3)  
SSM 33-24-02

 B. Access
 (1)  Location Zone
 200 Upper Deck Passenger Cabin

 C. Procedure
 S 434-006
 (1)  
Connect electrical wires to the sign.

 S 424-041

 (2)  
Install the light assembly.

 S 864-008

 (3)  
Remove DO-NOT-CLOSE tags and close these circuit breakers on the P414 Main Distribution Center - Left:

 (a)  
414G21 FSB SIGNS

 (b)  
414G22 NS SIGNS

 S 864-009
 (4)  
Supply electrical power (Ref 24-22-00/201).

 S 864-011

 (5)  
Set NO SMOKING switch on module M7332 on the P8 panel to the ON position.

 (6)
See that the no smoking part of the replaced sign is on.

 (7)  
See that the fasten seat belt part of the replaced sign is off.

 S 714-012
 S 714-013
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 (8)  S 864-014Set the SEATBELTS switch on module M7332 to the ON position.
 (9)  S 714-015See that the fasten seat belt part of the replaced sign is on.
 S 864-016

 (10)
 Set NO SMOKING and SEATBELTS switches to the OFF position.

 S 864-017

 (11)
 Remove electrical power if it is no longer necessary (Ref 24-22-00/201).

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2.

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747-400 MAINTENANCE MANUAL
 LAVATORY LIGHTS - DESCRIPTION AND OPERATION
___________________________________________
General
_______
 A.  Lavatory lighting includes internal lavatory illumination, internal passenger information signs, external lavatory occupied signs, and attendant call pushbutton/indicators.
 B.  Descrete signals generated by one set of door lock limit switches change fluorescent light intensity levels from dim to bright. The other set activates the LAV OCCUPIED light.
 C.  The LOCK DOOR sign is operated by the door lock switch contacts by energizing the RETURN TO SEAT relay. This relay also determines the DIM/BRT of the side mirror fluorescent lights.
 D.  For more data about this lighting system, refer to these sources:
 (1) SSM 33-26-01 thru SSM 33-26-99
 (2) WDM 33-26-11 thru WDM 33-26-99Operation
_________
 A.  Lavatory light and sign components are controlled by two circuit breakers on the P414 panel, and one on the P180 panel.
 B.  When the airplane is on the ground and the GND HDL BUS circuit breaker is closed, 115 volts ac is applied to GND HDL BUS TRANSFER RLY and to the ballast. The relay also opens the DIM/BRT circuit and the ceiling flourescent lights will stay on bright.
 C.  When the airplane is airborne and the GND HDLG BUS circuit breaker is open and LAV LIGHTS circuit breaker closed, 115 volts ac is applied to the ballast and the DIM/BRT circuit is completed, the ceiling fluorescent lights are held to dim. If the lav door is closed and locked, voltage is applied to the RETURN TO SEAT RLY. This causes the DIM/BRT circuit to open and the ceiling fluorescent lights will be on bright.
　
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