GE-CF6-80E1-114

Prévia do material em texto

N2
ECUCH A CH B
IDG
AGB
FUEL/OIL HEAT
 EXCHANGER
IDG AIR/OIL
 COOLER
FAN AIR
11th STAGE
IDG COOLING
VALVE
OIL OUT
OIL IN
HMU BYPASS
FUEL
RETURN TO
BOOST PUMP
IDG OIL TEMPERATURE
CONTROL
FEEDBACK
FUEL
TEMPERATURE
COLD
OIL
BYASS
OIL IN
TEMP
SENSOR
PRESSURE
A330 - ENGINE ATA 71 up 80
GE CF6-80E1 227 of 394
 
 
 
 
 
 
 
 
 
 
 
IDG AIR/OIL COOLING VALVE
The IDG Air/Oil Cooling Valve (IDGCV) is mounted to a bracket an the high
pressure compressor right hand side at 3:00.
The purpose of the IDGCV is to control the fan airflow to the IDG air/oil cooler.
System Operation
The IDGCV receives fan discharge air from the fan frame exit area. The air
flows through the valve and into the manifold which carries it to the air/oil
cooler. The air then exhausts into the nacelle area where it is carried overboard
through the nacelle vents. The flow of air through the valve is controlled to
minimize any SFC penalties at cruise.
The IDGCV is an electrically controlled, pneumatically operated butterfly type
valve. It has one 11th stage muscle air connection and one electrical
connection. There is a feedback switch located inside the valve. The switch
provides actual valve position feedback to the ECU. The valve is normally
spring loaded to the open position.
On the head of the valve housing there is a manual lockout screw and visual
position indicator. The screw is part of the valve’s manual lockout feature. The
lockout feature aids in the removal and installation of the valve.
The head of the screw is painted orange, and is safetywired into a storage
position when not being used. The lockout screw is only used during removal
and installation of the valve. To lock the valve closed the valve butterfly must
be manually closed with a wrench, and then the lockout screw inserted through
a hole in the visual indicator.
The IDGCV is controlled by the ECU based on
� IDG oil inlet temperature
� and fuel temperature
The ECU interface with the valve is an enable/disable circuit. The valve is
spring loaded open, but has an direct connection to 11th stage air pressure and
will close as engine speed increases (the valve is enabled). If at high power
when the valve is normally closed, and the oil or fuel temperatures become too
high, the ECU will energize the valve solenoid, terminating 11th stage muscle
air to the valve (disabled). Without 11th stage air to keep the valve closed, the
spring within the valve will cause the valve to reopen, thus providing cooling air
flow to the cooler.
The valve position is fed back to the ECU by a switch that closes when the
valve is closed. The ECU will monitor the IDGCV solenoid for wrap around
current, to ensure that there is no electrical open in the circuit.
IDG AIR/OIL COOLER
The IDG Air /Oil Cooler is mounted to a bracket an the high pressure
compressor right hand side at 3:00.
The IDG Air/Oil Cooler provides cooling of the IDG lubrication oil.
Operation
The IDG oil enters the IDG air/oil cooler and flows through the oil passage
ways. Fan discharge air flows through the cooler, which is controlled by the
ECU commanded air/oil cooling valve. The air flows around the oil passages of
the cooler. The cooler is equipped with a bypass valve for cold weather
operation, or if the cooler becomes clogged.
The air/oil cooler is a tube and fin ”radiator” type heat exchanger. It is
constructed of tubes surrounded by cooling fins that dissipate heat contained
within the oil.
A330 - ENGINE ATA 71 up 80
GE CF6-80E1 228 of 394