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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The passenger signs give these indications to the passengers
and attendants:
* NO SMOKING
* FASTEN SEAT BELT
* RETURN TO SEAT.
Physical Description
The passenger sign lights use incandescent lamps.
Location
The NO SMOKING and the FASTEN SEAT BELTS signs are at
these locations:
* Passenger service units (PSU)
* Forward left windscreen
* Galley
* Lavatories.
The RETURN TO SEAT signs are in the lavatories.
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Operation
A three-position toggle switch on the P5 forward overhead
panel controls the passenger signs. This switch is the FASTEN
SEAT BELT switch. When the switch is in the ON position, all the
passenger signs come on and there is a low chime.
NOTE: The NO SMOKING switch on the P5 forward overhead
panel does not effect the NO SMOKING lights. The NO
SMOKING signs are on when power is on.
When the FASTEN SEAT BELT switch is in the OFF position, the
FASTEN SEAT BELT and RETURN TO SEAT signs are off.
When the FASTEN SEAT BELT switch is in the AUTO position
and the trailing edge flaps limit switch is in the NOT UP position,
these indications occur:
* FASTEN SEAT BELT signs
* RETURN TO SEAT signs
* Low chime.
When the FASTEN SEAT BELT switch is in the AUTO position
and the landing gear lever switch is in the GEAR DOWN
position, these indications occur:
* FASTEN SEAT BELT signs
* RETURN TO SEAT signs
* Low chime.
Interface
The passenger oxygen system has an interface with the
passenger sign system. When the FASTEN SEAT BELT switch
is in the AUTO position and the oxygen indication relay
energizes, these indications occur:
* FASTEN SEAT BELT signs
* Low chime.
Functional Description
When you move the FASTEN SEAT BELT switch to the ON
position, 28v ac energizes relay R26. Transfer bus 1 then
supplies 28v ac to operate the passenger sign lights and the low
chime.
When the FASTEN SEAT BELT switch is in the AUTO position,
these indications occur:
* Relay R25 and R26 energizes if the landing gear is in the
down position, or when the oxygen indication relay
energizes
* Relay R26 energizes if the trailing edge flap limit switch is in
the NOT UP position.
LIGHTS - PASSENGER SIGNS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The attendant work lights supply light to the attendant work
stations.
Location
The attendant lights are in the ceiling above the attendant
stations. There is one work light for each attendant station. The
work light control switch is on the related attendant panel.
Physical Description
The attendant work lights are incandescent. The attendant work
lights have a lens and a lamp.
LIGHTS - ATTENDANT WORK LIGHTS - INTRODUCTION
EFFECTIVITY
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