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 E.  There is a LAVATORY OCCUPIED sign installed on the ceiling near each lavatory. When the lavatory door is closed and locked, the sign comes on (AMM 33-26-00/001). This lets the passengers know when there is a person in the lavatory.
 F.  For more data about this lighting system, refer to these sources:
 (1)  
SSM 33-24-01 thru 33-24-99

 (2)  
WDM 33-24-11 thru 33-24-99

 2.  Operation
_________
 A.  The signs operate with 28 volts of electrical power.
 B.  The LAVATORY OCCUPIED sign come on when the lavatory door is locked.
 C.  NO SMOKING, FASTEN SEAT BELT, and RETURN TO SEAT signs operate in an automatic or manual mode as selected with a switch on the pilot's control stand, P8.
 (1)  When the switch is set to the automatic position, discrete inputs from other functions control the signs as follows:
 NOTE: RETURN TO SEAT signs go off, if the passenger oxygen comes
____
 on.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 ~.............................................................. | FUNCTIONS THAT CONTROL SIGNS IN AUTOMATIC MODE | ................................................................ | | LANDING GEAR NOT UP AND LOCKED (OR) | | FASTEN | FLAP LEVER NOT IN RETRACT (OR) | | SEAT BELT | ON SOME AIRPLANES; | | SIGN | AIRPLANE ALTITUDE (OR) | | | CABIN PRESSURE (OR) | | | PASSENGER OXYGEN ON. | ................................................................ | NO | LANDING GEAR NOT UP AND LOCKED (OR) | | SMOKING | CABIN PRESSURE (OR) | | SIGN | PASSENGER OXYGEN ON. | ................................................................ | | LANDING GEAR NOT UP AND LOCKED (OR) | | RETURN TO | FLAP LEVER NOT IN RETRACT (OR) | | SEAT SIGN | ON SOME AIRPLANES; | | | AIRPLANE ALTITUDE (OR) | | | CABIN PRESSURE. | 2...............…..............................................1
 (2)  
To operate the signs in the manual mode, the switch is set to the on position. This makes the signs come on.

 (3)  
With the switch set to the off position, the signs are usually off. Cabin decompression will override any switch position and activate the signs.

 (4)  
Activation of either sign will produce a corresponding tone from area chimes.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 FAULT ISOLATION/MAINT MANUAL
PASSENGER INFORMATION SIGNS

 * SEE THE SSM OR WDM FOR THE EQUIPMENT NUMBER, QUANTITY AND LOCATION OF EACH COMPONENT IN THE LIGHTING CIRCUIT.
Passenger Information Signs - Component Index
Figure 101

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
FAULT ISOLATION/MAINT MANUAL

FLIGHT COMPARTMENT

FLT DECK DOOR
NO SMOKING
LKD  w 
UNLKD  w 

SEATBELTS
AUTO
AUTO
OFF
ON OFF

ON

PASSENGER SIGNS

A
Passenger Information Signs - Component Location
Figure 102 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
SEE C
　
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