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D633W101-BEJ Jan 05/2002
PNEUMATIC -INTRODUCTION
The pneumatic system supplies air from one of these sources to the user systems: * Engines
* Auxiliary power unit (APU)
The user systems use the air supply for these functions: * Start the APU
* Supply aft and bulk cargo heat
* Cabin pressurization and air conditioning
* Prevent ice from forming on the wing slats
* Supply air flow across the total air temperature probe
* Pressurize the hydraulic reservoirs
* Pressurize the potable water tanks
* Supply power to the air driven hydraulic pumps.
Abbreviations and Acronyms * ACIPS -airfoil and cowl ice protection system
* ACMS -airplane condition monitoring system
* ADIRU -air data inertial reference unit
* ADP -air driven pump
* AFDS -autopilot flight director system
* AGS -air ground system
* AIMS -airplane information management system
* APU -auxiliary power unit
* APUC -auxiliary power unit controller
* ARINC -aeronautical radio, inc.
* ASC -air supply control
* ASCS -air supply control system
* ASCPC -air supply cabin pressure controller
* ASG -arinc signal gateway
* CMCF -central maintenance computing function
* CMCS -central maintenance computing system
* CPC -cabin pressure control
* CPCS -cabin pressure control system
* CTC -cabin temperature controller
* DDG -dispatch deviations guide
* DLODS -duct leak and overheat detection system
* EAI -engine anti-ice
* EAS -engine air supply
* ECS -environmental control system
* ECSMC -environmental control system miscellaneous card
* EEC -electronic engine control
* EFIS -electronic flight instrument system
* EICAS -engine indicating and crew alerting system
* ELMS -electrical load management system
* FAMV -fan air modulating valve
* FMCS -flight management computing system
* FS -manifold flow sensor
* FSEU -flap/slat electronics unit
* HPC -high pressure compressor
Page 1 D633W101-BEJ Sep 05/2002
PNEUMATIC -INTRODUCTION
* HPFAC -high pressure fan air controller * WAI -wing anti-ice
* HPSOV -high pressure shutoff valve * WES -warning electronic system
* HYD -hydraulic * WOW -weight on wheels
* HYDIM -hydraulic interface module
* IP -intermediate pressure
* IPCV -intermediate pressure check valve
* OPAS -overhead panel ARINC 629 system
* PRESSN -pressurization
* PRSOV -pressure regulating and shutoff valve
* PRSOVC -pressure regulating and shutoff valve controller
* PSEU -proximity sensor electronic unit
* RVDT -rotary variable differential transformer
* TAT -total air temperature
* TM -manifold dual temperature sensor
* VCU -valve control unit
EFFECTIVITY BEJ ALL 36-00-00 Page 2 D633W101-BEJ Jan 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
PNEUMATIC -INTRODUCTION
EFFECTIVITY BEJ ALL 36-00-00 Page 3 D633W101-BEJ Jan 05/2002
PNEUMATIC -GENERAL DESCRIPTION
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