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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
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POWER PLANT -INTRODUCTION
Two Pratt and Whitney engines supply airplane thrust during all phases of flight. The PW4000 series engine is a high bypass ratio, turbofan engine. The engines supply power for the electric, hydraulic, and pneumatic systems.
The engine systems are described in this sequence:
*
Power plant (71)
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Engine (72)
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Engine fuel and control (73)
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Engine controls (76)
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Engine indicating (77)
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Oil (79)
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Air (75)
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Starting (80)
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Ignition (74)
*
Exhaust (78).
Abbreviations and Acronyms
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EAI -engine anti-ice
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EEC -electronic engine control
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eng -engine
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ERU -engine relay unit
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FMU -fuel metering unit
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gnd -ground
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hdlg -handling
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IDG -integrated drive generator
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PDOS -powered door opening system
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PRSOV -pressure regulating and shutoff valve
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TIP -training information points
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T/R -thrust reverser
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VSVA -variable stator vane actuator
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TCC -turbine case cooling
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TVBC -turbine vane and blade cooling
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TVC -turbine vane cooling
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
POWER PLANT -INTRODUCTION
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PW4000 SERIES ENGINES
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POWER PLANT -ENGINE HAZARD AREAS
It is dangerous to work around engines. Use the engine entry corridors to go near an engine in operation. You must stay out of the inlet and exhaust hazard areas when the engine is running.
The hazard areas around jet engines in operation include:
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Engine entry corridors
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Inlet suction
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Heat
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Exhaust
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Noise.
Engine Entry Corridors
Engine entry corridors are between the inlet hazard areas and the exhaust hazard areas. You should go near an engine in operation only when:
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The engine is at minimum idle power (forward thrust only)
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You can speak with the personnel in the flight compartment.
The engine entry corridors for the PW4000 series engine on the 777 are the not same as other engines from other engine manufacturers.
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