READING LIGHTS -FUNCTIONAL DESCRIPTION
Functional Description
The configuration data base that is loaded in the cabin services system (CSS) sets the lights that come on in each selection.
Light selections made on the passenger control unit (PCU) (not shown) make the applicable passenger reading light come on or go off. The OEU sets the selected light to the commanded condition.
The CSCP and CACP can also control the reading lights from the readings lights screen. The OEU sets the reading lights for the applicable area to the commanded condition. The normal mode gives control back to the PCU.
Power
The main buses must have power for the reading lights to operate.
See the passenger service system section for more information about the OEU (SECTION 23-33).
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
INFORMATION SIGNS -INTRODUCTION
Purpose The return to seat signs use LEDs. You replace the sign if the
LEDs fail. These information signs give information to the passengers and attendants:
*
No smoking sign
*
Fasten seat belt sign
*
Return to seat sign.
Location
There are information signs in these locations:
*
Passenger service units (PSUs)
*
Overdoor panels
BEJ 001-005
* Purser station (not shown)
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* Lavatories.
There are no smoking and fasten seat belts signs on the passenger service units (PSUs) and in the overdoor panels near the attendant seats.
There are return to seat signs in the lavatories.
Training Information Point
The no smoking and fasten seat belt signs have lamps that you can replace. You remove the lens to get access to the lamps.
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INFORMATION SIGNS -GENERAL DESCRIPTION
General
The passenger service system (PSS) supplies control signals for the information signs. The PSS gets inputs from the left and right systems ARINC 629 buses, the flight attendants, and the cabin services system configuration database.
Components
These are the main components of the information signs system:
*
No smoking selector
*
Seat belt selector
*
No smoking sign
*
Fasten seat belt sign
*
Return to seat sign.
The PSS also supplies control for the lavatory-occupied signs and the lavatory door-lock signs (not shown). These signs are not part of the information signs system.
See the lavatory lights and signs section for more information about lavatory lights (SECTION 33-26).
These other systems and components have an interface with the information signs system:
*
Overhead panel ARINC 629 system (OPAS)
*
Airplane information management system (AIMS)
*
Electrical load management system (ELMS)
*
Flap/slat electronics unit (FSEU)
*
Proximity sensor electronics unit (PSEU)
*
Cabin services system (CSS)
*
Passenger service system (PSS).
PSS Control
The PSS controls these information signs:
*
No smoking sign
*
Fasten seat belts sign
*
Return to seat sign
The PSS makes the signs come on or go off and sounds a chime based on selector position and airplane conditions.
*
Signs come on or go off
*
Chime
*
A pre-recorded announcement plays.
The PSS causes an all airplane chime when the signs come on or go off. The configuration data base specifies the chime type (HI, LO, HI/LO, LO/HI).
For more information about the conditions that cause the signs to turn on or go off, see the information about information sign control logic in this section.
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