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Page 10 D633W101-BEJ Jan 05/2002

GENERATOR DRIVE -INTEGRATED DRIVE GENERATOR

General
The IDG supplies electrical power to the airplane. It is a combination of a constant speed drive (CSD) and an ac generator. The CSD turns the generator at a constant speed to make constant frequency electrical power. Oil lubricates the IDG and makes it cool.
Electrical Connections
These are the four electrical connections on the IDG:
*
Terminal block

*
Electrical connector A

*
Electrical connector B

*
Electrical connector C.

The terminal block connects the power feeder cables to the IDG. The other connectors transmit control and monitoring inputs and outputs. They also transmit the PMG output.
Mechanical Items
You can get access to these mechanical items on the IDG:
*
Input shaft (with aneroid valve)

*
Aspirator

*
Check valve

*
Disconnect solenoid with thermal plug

*
Case relief valve

*
Oil out port

EFFECTIVITY
BEJ ALL

BEJ 001-005
* Oil filter
BEJ 006-999
* Oil filters
BEJ ALL
*
Oil in port

*
Case drain

*
Charge relief valve.

The aneroid valve, aspirator, and check valve keep a positive pressure inside the IDG when it operates. The aspirator pulls air in through the check valve. The air goes out through the aneroid valve. This prevents the collection of moisture in the IDG.
The case relief valve prevents the rupture of the IDG case if the fuel/oil cooler leaks.
The charge relief valve regulates the oil pressure of the IDG.
Maintenance Items
You use these items to maintain the IDG:
*
Disconnect reset ring

*
Oil level sightglass

*
Overfill drain port

*
Pressure fill port.

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GENERATOR DRIVE -INTEGRATED DRIVE GENERATOR

The disconnect reset ring lets you reset the drive disconnect mechanism. A solenoid operates the disconnect mechanism. You pull on the ring while the engine is shutdown to connect the drive shaft halves.
NOTE: The IDG can automatically disconnect if the IDG oil gets too hot. A thermal plug melts and operates the disconnect mechanism. If the IDG disconnects automatically with the thermal plug, the reset ring cannot connect the drive shaft halves. The IDG must be reset at the repair shop.
You use the sightglass, fill port, and drain port to service the IDG oil.
Indication Items
These items supply data you use to make a check of the operational status of the IDG:
*
Differential pressure switch (internal)

*
Differential pressure indicator

*
Remote oil level sensor

*
Charge pressure switch (internal).

The differential pressure switch monitors the oil pressure upstream and downstream of the oil filter. The switch sends a signal that tells if the oil filter is clogged.
The differential pressure indicator has a red button. The red button moves out when the oil filter is clogged.
BEJ 006-999
Only the Scavenge filter has a differential pressure switch and indicator.
BEJ ALL
The remote oil level sensor sends the IDG oil level status to the GCU. The GCU supplies the primary display system with this data.
The charge pressure switch connects to the GCU. The switch monitors the oil pressure inside the IDG.
Training Information Point
BEJ 001-005
The only LRMs on the IDG are the oil filter and the remote oil level sensor.
BEJ 006-999
The only LRMs on the IDG are the oil filters and the remote oil level sensor.
BEJ ALL
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GENERATOR DRIVE -INTEGRATED DRIVE GENERATOR

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GENERATOR DRIVE -INTEGRATED DRIVE GENERATOR

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777 AIRCRAFT MAINTENANCE MANUAL

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Page 15 D633W101-BEJ Sep 05/2003

GENERATOR DRIVE -IDG QAD COUPLING

General
The QAD coupling attaches the IDG to the gearbox. It has an adapter plate, a ring, index marks, and a tension bolt. You turn the tension bolt to turn the ring. When the ring releases the IDG, the ring index mark aligns with the adapter plate index mark and the IDG index mark.
Training Information Point
There is a TOP mark that shows you how to put a new QAD coupling on the gearbox. You put the TOP mark at the 12:00 position.
　
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