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 8.  IDG Air/Oil Heat Exchanger Valve Override Pressure Switch (Fig. 1)
_________________________________________________________
 A.  The IDG air/oil heat exchanger valve override pressure switch controls the 28-volt dc GCU signal input to the IDG air/oil heat exchanger valve.
 B.  The switch is mounted to the HPC secondary flow control valve and IDG air/oil heat exchanger valve override solenoid. The switch is a single-pole, double-throw type switch and is normally spring-loaded open. The switch is activated closed when 15th-stage HPC muscle pressure, supplied by the IDG air/oil heat exchanger valve override solenoid, reaches 75 psig. When the switch is closed, the IDG air/oil heat exchanger valve is controlled by the GCU. When the switch is open, the GCU logic is overridden and the IDG air/oil heat exchanger valve is controlled by EEC logic.
 9.  IDG Quick Attach-Detach Ring (Fig. 1)
____________________________
 A.  The quick attach-detach (QAD) ring allows rapid installation and removal of the IDG to and from the engine main gearbox. The ring assembly includes a QAD ring and an adapter plate. The ring mates along the outside edge of the adapter plate, which is mounted to the main gearbox. An IDG mounting flange (on the IDG), mates the IDG with the QAD ring. The QAD ring secures the IDG in a breech-type lockup.
 10. Operation
_________
 A.  Functional Description (Fig. 2, 3, 4, and 5)
 (1)  The integrated drive generator (IDG) consists of an axial gear differential/hydraulic speed control section, and a generator section, mounted side-by-side in a single housing.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

PRESSURIZATION
INPUT DRIVE VENT VALVE
DISCONNECT

DRIVE DISCONNECT
RESET
HANDLE

TRIM COIL
CHARGE PRESS. SWP
OUTPUT TO GCU
140 PSI  OIL IN
CHARGE PRESS.
SWITCH
INPUT

GOVERNOR
DISCONNECT
SOLENIOD

TRIM COIL
T
CONTROL INLET OIL
FUEL/OILFIXED
AIR EXHAUST ADD SUBTRACTCYLINDER TEMP SENSOR
COOLER 250 PSI
OUTPUT TO GCU
SLIPPER WOBBLER
CASE

SUMP
VARIABLE
EXTERNAL OIL
CHARGE 250
WOBBLER  CIRCUIT BYPASS
DE-AERATOR
DEPRESSURIZATION PRESS.
PSID
VALVE
VENT VALVE
RELIEFVALVE TWIN HYDRAULIC LOGS
AIR/OIL HEATEXCHANGER
CHARGEPUMP
OUTPUT OILSUMP
TEMP SENSOROUTPUT TO GCU
1
INPUT
DISCONNECT

OIL OUT GEAR
SUMMING 2
SCAVENGEFILTER
60 PSID
SUMMING
3
DELTA PRESSURE
GEAR
INPUT INDICATOR
DIFFERENTIAL
SPEED
INPUT

SENSOR
SHEAR
SECTION

OUTPUT INPUTTRIM
IDG PRESSUREMAIN GEARBOX FILL PORT
CHARGE
PRESSURE
MONITOR

PMG OUTPUT TO GCUBOSS
SPEED SENSOR OUTPUTTO GCU
350 PSI
SCAVENGE
MAIN EXCITER INPUT FROMPRESS.
GCU RELIEF
SCAVENGE
PUMPS
VALVE

MAINEXCITER ALL-
DIFFERENTIAL PROTECTIONATTITUDE
CURRENT TRANSFORMER
1  OIL FOR LUBRICATIONOIL HOLDING OUTPUT TO GCU
AND CONTROL  TANK
MAIN
GEN

2 OIL FOR LUBRICATIONNEUTRAL
3  OIL FOR LUBRICATIONAND COOLING
3
4 PHASE C
4  OIL FOR COOLING PHASE B
INLET PRESSURE MAIN GENERATOR
PERMANENT CURRENT
OUTPUT TO GCBGENERATOR
MAGNET TRANSFORMERS
SUPPLY PRESSURE
PHASE A
CHARGE PRESSURE

OVER FLOW
DRAIN

OIL LEVEL
CONTROL PRESSURE
SIGHT GAUGE TERMINAL
SCAVENGE PRESSURE

BLOCK INTEGRATED DRIVE GENERATOR
Generator Drive System Block Diagram
Figure 2 (Sheet 1)

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 24-11-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

INPUT DRIVE
DISCONNECT

DRIVE DISCONNECT
RESET
HANDLE

TRIM COIL
　
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