*
Left and right cabin temperature controllers (CTC)
*
Overhead panel ARINC 629 system (OPAS)
*
Electronic engine control (EEC)
*
Airplane information management system (AIMS)
*
Electrical load management system (ELMS)
*
Warning electronic system (WES)
*
Auxiliary power unit controller (APUC)
*
Flap slat electronics unit (FSEU)
*
ARINC signal gateway (ASG)
See the section on the ASCPC for more information on interfaces.
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777 AIRCRAFT MAINTENANCE MANUAL
PNEUMATIC -GENERAL DESCRIPTION
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PNEUMATIC -COMPONENT LOCATIONS
Component Locations
Two ASCPCs are in the main equipment center. The left ASCPC is on the E1-2 shelf. The right ASCPC is on the E2-2 shelf.
The bleed air/pressurization panel is on the P5 overhead panel. Switches on the bleed air part of the panel give control and indications for the pneumatic system.
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PNEUMATIC -COMPONENT LOCATIONS
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PNEUMATIC -OPERATION
Bleed Air/Pressurization Panel
Switches on the bleed air/pressurization panel (P5) have interfaces with the left and right ASCPCs to give control and supply indications for the pneumatic system. These switches control and give indications for the pneumatic sources:
*
Left engine bleed switch (L ENG)
*
APU bleed switch (APU)
*
Right engine bleed switch (R ENG).
These switches control and give indications for the pneumatic distribution:
*
Left isolation valve (L ISLN)
*
Center isolation valve (C ISLN)
*
Right isolation valve (R ISLN).
See the indicating section for more information about the indicating system (SECTION 36-20).
Engine Bleed Switches
The L ENG and the R ENG switches have an annunciator light that comes on when the pressure regulation and shutoff valve (PRSOV) is set to off by the related ASCPC. The switches have two positions:
*
In (usual position)
*
Out (non-normal).
The ON position (switch in) lets the related engine bleed air system supply air when the engine is running.
The switch out position sets the related engine bleed air system so it does not supply air and turns on the OFF light in the switch. The OFF light gives an indication that the PRSOV is set to OFF and does not relate to the actual position of the PRSOV.
When the switch is in, the OFF light comes on if the engine is off or if any of the these protective shutdown, non-normal conditions occurs:
*
Wing or strut duct overheat (wing bleed loss)
*
Bleed air overtemperature
*
Bleed air overpressure
*
Engine fire switch pulled.
When the OFF light is on, the BLEED OFF ENG L(R) advisory message usually shows. This message does not show if the engine is off or if the OFF light comes on because of wing or strut overheat. See the duct leak and overheat detection section for more information (SECTION 26-18).
See the engine air supply section for more information on engine bleed air control and operation (SECTION 36-12).
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PNEUMATIC -OPERATION
APU Bleed Switch
The APU switch has an annunciator light that comes on when the APUSOV is closed because of a non-normal condition. The APU switch has two positions:
*
In (usual position)
*
Out (non-normal).
The AUTO position (switch in) lets the APU shutoff valve (APUSOV) OPEN/CLOSE as necessary to supply air to the pneumatic distribution system.
See the air supply distribution section for more information about the APU shut off valve OPEN/CLOSE position control (SECTION 36-12).
The switch out position sets the APU shutoff valve to close. With the switch set to out, the OFF light in the switch comes on when the valve closes.
When the switch is in, the OFF light comes on when the valve is closed and any of the these non-normal conditions occurs:
*
Wing or body duct overheat
*
APUSOV failed closed
*
APU fire switch pulled.
EFFECTIVITY
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