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ENGINE -INTRODUCTION
The engine weight includes the engine build up (EBU) equipment that Boeing installs. The engine-driven hydraulic pump (EDP), the integrated drive generator (IDG), and the inlet cowl are examples of EBU equipment.
Abbreviations and Acronyms
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AGB -angle gearbox
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BET -Boeing equivalent thrust
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EBU -engine build up
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EDP -engine-driven pump
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FEGV -fan exit guide vane
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FMU -fuel metering unit
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HPC -high pressure compressor
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HPT -high pressure turbine
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IDG -integrated drive generator
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LPC -low pressure compressor
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LPT -low pressure turbine
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MGB -main gearbox
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PMA -permanent magnet alternator
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PW -Pratt and Whitney.
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TEC -turbine exhaust case
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TO -takeoff
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TVBCA -turbine vane and blade cooling air
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
ENGINE -INTRODUCTION
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PW4000 SERIES ENGINES
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ENGINE -INTRODUCTION
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PW4000 SERIES ENGINES
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ENGINE -GENERAL DESCRIPTION -1
General
The Pratt and Whitney PW4000 engine is a high bypass, two shaft, turbofan engine. It has a low pressure (LP) rotor system (N1) and a high pressure (HP) rotor system (N2).
The engine has station numbers to identify bleed air, and temperature or pressure sensor locations along its axis.
Engine flanges have letter identifiers. The inlet cowl attaches to flange A at the forward end of the engine. The exhaust nozzle and plug attach to flanges T and T1 at the aft end.
Airflow
The engine has primary (core) airflow and secondary (bypass) airflow. The bypass ratio of this engine is 6.4:1. This means that
6.4 times more secondary air goes through the engine, than primary air.
The primary airflow goes through the compressors, diffuser and combustor, and turbines. The combustor also gets fuel from the fuel nozzles. This mixture of air and fuel burns to make high pressure exhaust gas. The exhaust gas goes out of the combustor to turn the turbines. The exhaust gas from the primary airflow makes approximately 20 percent of the forward thrust.
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