When you add oil, you must attach a drain hose to the backup generator overflow drain valve. Add oil until at least one quart (liter) of oil comes out of the drain valve hose, then stop. When the flow out of the overflow hose is within limits, disconnect the pressure fill hose and the drain valve hose.
WARNING: DO NOT LET HOT OIL GET ON YOU. PUT ON CLOTHES, GOGGLES, AND EQUIPMENT FOR PROTECTION OR LET THE ENGINE BECOME COOL. HOT OIL CAN BURN YOU.
WARNING: WHEN YOU CONNECT THE OVERFLOW COUPLING TO THE OVERFLOW DRAIN VALVE, USE A RAG AROUND THE FITTING. THIS WILL PREVENT A SPRAY CAUSED BY PRESSURE IN THE BACKUP GENERATOR CASE. HOT OIL CAN BURN YOU.
CAUTION: THE OIL OVERFLOW HOSE AND COUPLING MUST BE CONNECTED TO THE OIL OVERFLOW DRAIN VALVE TO RELEASE INTERNAL PRESSURE IN THE BACKUP GENERATOR. THE OVERFLOW HOSE AND COUPLING MUST REMAIN CONNECTED TO THE OVERFLOW DRAIN VALVE UNTIL SERVICING IS COMPLETED AND OIL OVERFLOW HAS SLOWED TO A FEW DROPS A MINUTE. FAILURE TO DO THIS CAN RESULT IN OVERFILLING WITH OIL, WHICH CAN CAUSE THE BACKUP GENERATOR TO BE DAMAGED DURING OPERATION.
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GENERATOR DRIVE -BACKUP GENERATOR -OIL SERVICING
CAUTION: DO NOT MIX TYPES OR BRANDS OF OIL IN THE BACKUP GENERATOR. INCORRECT OILS CAN CAUSE DAMAGE TO THE BACKUP GENERATOR.
CAUTION: DO NOT REMOVE THE OIL OVERFLOW HOSE AND COUPLING FROM THE OVERFLOW DRAIN VALVE UNTIL SERVICING IS COMPLETED AND OIL OVERFLOW HAS SLOWED TO A FEW DROPS A MINUTE. FAILURE TO DO THIS CAN RESULT IN OVERFILLING WITH OIL, WHICH CAN CAUSE THE BACKUP GENERATOR TO BE DAMAGED DURING OPERATION.
Training Information Point
When the backup generator operates, the maintenance page does not get new oil level data. The oil level data shows as two dashes.
The oil level data shows blank for any of these conditions:
*
Engine shutdown (blank for approximately 10 minutes)
*
Initial converter power-up (blank for approximately 10 minutes)
*
Data is invalid due to a fault.
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GENERATOR DRIVE -BACKUP GENERATOR -OIL SERVICING
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GENERATOR DRIVE -APU GENERATOR
Purpose The APU generator is a secondary source of electrical power for airplane systems. It can supply electrical power when the airplane is on the ground or during flight. It can supply 120 kva of ac power. Location The APU generator is in the APU compartment. It attaches to the accessory pad of the APU gearbox. A seal plate is between the APU generator and the APU gearbox. Interfaces The APU GCU controls the APU generator. An indexing pin (not shown) on the APU generator helps you align it with the APU gearbox when you install it.
The APU gearbox turns the APU generator. The APU oil system lubricates the APU generator and keeps it cool.
The APU generator has a terminal block and two electrical connectors. The oil ports are part of the mounting flange to the accessory pad. The seal plate prevents oil leakage at the mounting flange. Training Information Point The APU generator has keyhole slots in the mounting flange. You do not remove the fasteners to remove or replace the generator.
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777 AIRCRAFT MAINTENANCE MANUAL
GENERATOR DRIVE -APU GENERATOR
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777 AIRCRAFT MAINTENANCE MANUAL
THIS PAGE IS INTENTIONALLY LEFT BLANK
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GENERATOR DRIVE -FUNCTIONAL DESCRIPTION
General
The gearbox of each engine turns an IDG and a backup generator. The related GCU controls the IDG. The backup generator converter controls the backup generators on both engines. Oil goes through the generators to make them cool. Heat exchangers take the heat from the oil. The IDG oil subsystem operates independently of the backup generator oil subsystem.
IDG Operation
The GCU causes the flight deck effects for the IDG. If the IDG has low pressure during operation, the GCU turns on the DRIVE light and makes an EICAS message. The drive disconnect switch on the electrical panel controls the disconnect solenoid.
The pumps in the IDG move the IDG oil. The oil filter removes unwanted particles from the oil. The differential pressure indicator and the MFD electrical maintenance page tell you if the filter is clogged. The GCU causes the maintenance page to show the oil level status.
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Backup Generator Operation
The backup generator converter causes the flight deck effects for the backup generator. The supply pump in the backup generator moves the backup generator oil. The oil filter removes unwanted particles from the oil. The differential pressure indicator and the MFD electrical maintenance page tell you if the filter is clogged. The backup generator converter causes the maintenance page to show the oil level status.
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