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PSS -OEU INSTALLATION -LAVATORIES AND LOWERED CEILING AREAS
General
There are overhead electronics units (OEUs) in these locations:
*
Each lavatory
*
Above each passenger door
*
Some lowered ceiling panels.
The diagram shows a typical lavatory and typical door area with lowered ceiling panels.
Lavatories
The lavatory OEUs mount to a passenger service unit (PSU) rail adjacent to the lavatory.
Training Information Point
You must remove ceiling panels adjacent to the lavatory to get to the OEU.
Overdoor Panels
Panels over each passenger door have an OEU.
Release the latches of the overdoor panel and lower it to get access to the OEU.
Lowered Ceiling Panels
The flight deck aisle access panel (near door 1 left) and a lowered ceiling panel at door 4 left have OEUs.
Training Information Point
Lower the flight deck aisle access panel to get access to the OEUs in the door 1 area.
Release the latches of the door 4L overdoor panel and lower it to get access to the OEU on the lowered ceiling panel.
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PSS -OEU INSTALLATION -LAVATORIES AND LOWERED CEILING AREAS
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PSS -PASSENGER SERVICE UNIT
General
The passenger service unit (PSU) has these passenger service system items:
*
Row call lights
*
Reading lights
*
Passenger information signs.
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777 AIRCRAFT MAINTENANCE MANUAL
PSS -PASSENGER SERVICE UNIT
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PSS -PASSENGER INFORMATION SIGNS
General
The passenger information signs show passengers these PSS conditions:
*
No smoking
*
Lavatory occupied
*
Fasten seat belt.
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777 AIRCRAFT MAINTENANCE MANUAL
PSS -PASSENGER INFORMATION SIGNS
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PSS -TYPICAL LAVATORY COMPONENTS
General Lavatory Door Latch
These lavatory components send and get signals through an The lavatory door latch sends a signal to the PSS to make the overhead electronics unit (OEU): lock door sign go off and a lavatory occupied sign come on.
*
Lavatory call light/reset switch
*
Return to seat sign
*
Lavatory call switch
*
Lock door sign
*
Lavatory door latch.
Lavatory Call Light/Reset Switch
The lavatory call light comes on when you push the lavatory call switch. Attendants push this light/switch to cancel lavatory calls.
Return to Seat Sign
The return to seat sign comes on when the fasten seat belt signal is active and and cabin pressure is normal.
Lavatory Call Switch
Passengers use the lavatory call switch to call an attendant. The lavatory call switch makes the PSS do these things:
*
The lavatory call light outside the lavatory comes on
*
A lavatory master call light at an attendant station comes on
*
A signal goes to the passenger address system for a chime.
Lock Door Sign
The lock door sign is on when the lavatory door is not locked.
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777 AIRCRAFT MAINTENANCE MANUAL
PSS -TYPICAL LAVATORY COMPONENTS
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PSS -CONFIGURATION DATABASE PROGRAMMED ITEMS
General
The cabin management system (CMS) configuration database supplies details of CMS operation. For the PSS, the database gives configuration data for these items:
*
Master call light assignments
*
Row call light assignments
*
Lavatory call light assignments
*
Reading light assignments
*
Chime mute areas
*
Passenger information sign control
*
Panels for PSS on/off control
*
OEU configuration.
Master Call Light Assignments
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