777 AIRCRAFT MAINTENANCE MANUAL

ELMS -SPECIAL FUNCTION TESTS

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777 AIRCRAFT MAINTENANCE MANUAL

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GENERATOR DRIVE -INTRODUCTION

General
The generator drive system normally supplies electrical power to all of the electrical loads while the engines operate. The integrated drive generators (IDGs) are the primary sources of electrical power. The APU generator and the backup generators are secondary sources of electrical power.
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777 AIRCRAFT MAINTENANCE MANUAL

GENERATOR DRIVE -INTRODUCTION

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GENERATOR DRIVE -GENERAL DESCRIPTION

General
Two IDGs are primary power sources. The APU generator, and two backup generators are secondary power sources.
A fuel/oil cooler and air/oil heat exchangers remove heat from the generators. Air/oil heat exchanger valves control the airflow through the air/oil heat exchangers.
Electrical Interfaces
Switches on the electrical panel control the IDG disconnect operations. GCUs control the IDGs and the APU generator. One backup generator convertor controls the two backup generators. Lights on the electrical panel and EICAS messages show generator drive system information.
The electronic engine control (EEC) controls the IDG air/oil heat exchanger valve and the backup generator air/oil heat exchanger valve.
Mechanical Interfaces
Each engine mechanically turns an IDG and a backup generator. The IDGs change the mechanical power to constant-frequency ac electrical power. The backup generators change the mechanical power to variable-frequency ac electrical power. The backup generator converter changes the variable-frequency ac power to constant frequency ac power.
When it is necessary, the air/oil heat exchanger valves send engine fan air or engine 2.5 bleed air through the related air/oil heat exchangers. The air/oil heat exchangers cool oil from the related generators. The fuel/oil cooler uses engine fuel to cool the IDG oil. The fuel/oil cooler always cools the IDG oil.
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777 AIRCRAFT MAINTENANCE MANUAL

GENERATOR DRIVE -GENERAL DESCRIPTION

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GENERATOR DRIVE -COMPONENT LOCATIONS -GEARBOX

General
There is an IDG and a backup generator on the main gearbox of each engine. The backup generator attaches to the front of the gearbox at the 6:30 position. The IDG attaches to the aft side of the gearbox at the 6:30 position.
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GENERATOR DRIVE -COMPONENT LOCATIONS -GEARBOX

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GENERATOR DRIVE -COMPONENT LOCATIONS -ENGINE

General
Each engine has these generator system components:
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Backup generator air/oil heat exchanger

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Backup generator air/oil heat exchanger valve

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Backup generator oil in and oil out temperature sensors

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IDG air/oil heat exchanger

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IDG air/oil heat exchanger valve

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IDG oil in and oil out temperature sensors.

Component Locations
The backup generator air/oil heat exchanger valve attaches to the intermediate case at the 9:30 position. The backup generator air/oil heat exchanger attaches to the aft side of the air/oil heat exchanger valve. The backup generator oil temperature sensors are in oil lines aft of the heat exchanger.
The IDG air/oil heat exchanger valve attaches to the intermediate case at the 4:00 position. The IDG air/oil heat exchanger attaches to the aft side of the IDG air/oil heat exchanger valve. The IDG oil in temperature sensor is on the front part of the fuel/oil cooler. The IDG oil out temperature sensor is in an oil line below and aft of the heat exchanger.
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GENERATOR DRIVE -COMPONENT LOCATIONS -ENGINE

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777 AIRCRAFT MAINTENANCE MANUAL
　
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