INFORMATION SIGNS -OPERATION

Operation
You use the selectors on the P5 overhead panel to choose one of the three modes:
*
On

*
Off

*
Auto.

You use the smoking assignments screen to make changes to the size of the smoking areas. The configuration database in the CSS controls how this screen looks and if it is active. The configuration database can also set some or all of the no smoking signs permanently on.
Flight Compartment Indication
A memo message shows on the EICAS display when a selector is in the ON position. Each selector has a related message. If the two selectors are in the ON position, then only the PASS SIGNS ON message shows.
Smoking Assignments Screen Controls and Indications
Touch SMOKING ASSIGNMENTS on the cabin controls main menu to show this screen.
Use the left and right arrows to make a selection of the cabin areas. The space between the arrows shows the cabin area description.
Use the smoking row select up and down arrows to set a start and end seat row. Use the selections in the seat column select area to set columns. If you do not set a column, any row changes have an effect on all columns.
Touch SMOKING or NO SMOKING to make the set seats as smoking or no smoking.
The smoking seats area of this display shows all assigned smoking seats in the cabin area. Use the up and down arrows to scroll through the list.
Touch AREA RESET to cancel all changes to the area. Smoking seat assignments go back to those set by the configuration database.
Training Information Point
You can use the CSS to do a test of the information signs.
See the passenger compartment lights section for more information about the information signs tests (SECTION 33-20).
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INFORMATION SIGNS -OPERATION

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INFORMATION SIGNS -FUNCTIONAL DESCRIPTION -INTRODUCTION

General
The passenger address/cabin interphone (PA/CI) controller usually controls the information signs.
If the PA/CI fails, the cabin system management unit (CSMU) controls the information signs.
The PA/CI controller or the CSMU sends information sign on/off command signals to the ZMUs.
The information signs have these modes:
*
Off

*
Auto

*
On.

The transfer buses must have power for the information signs to operate.
Software logic used by the PA/CI controller and the CSMU sets when and which signs should be on or off. The configuration database can be changed to set the RETURN TO SEAT sign on steady or flashing when the sign is set to on.
The following describes the functions for the different parts of the circuit. For information about control logic, see the control logic page in this section.
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Off Mode
When either selector is in the OFF position, a signal goes to the overhead panel ARINC 629 system (OPAS). The OPAS sends the signal to the AIMS, the PA/CI controller and to the CSMU.
The PA/CI controller or the CSMU use this information to calculate when to set the applicable sign(s) to off:
*
Selector position

*
CSS configuration data base (defines the smoking/no
smoking areas).

*
Smoking assignments CSCP/CACP screen (cabin attendant adjustments to smoking/no smoking areas).

*
The condition of the passenger oxygen system (deployed or not deployed).

The PA/CI controller or CSMU send an off command signal to the zone management units (ZMU). The ZMUs send the signal to the overhead electronic units (OEU). Switches in the OEUs open to make the applicable sign(s) go off.
The PA/CI controller sends a signal to the speaker drive modules (SDM) in all parts of the airplane. The SDMs cause a chime to sound.
The chime sounds when the lights go off or come on. The configuration data base specifies the type of chime (HI, LO, HI/ LO, or LO/HI).
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INFORMATION SIGNS -FUNCTIONAL DESCRIPTION -INTRODUCTION

On Mode
The PA/CI controller or the CSMU set the applicable sign(s) to on based on the same information used to set the signs to off.
The on signals go the same way as the off mode. The on signal causes the applicable sign(s) to turn on and causes a chime to sound.
A memo message shows that relates to the selector that is set to ON. If both selectors are set to ON, then only the PASS SIGNS ON memo message shows.
　
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