GENERAL
The Integrated Drive Generator (IDG) oil cooling system consists of a
self-contained oil circuit and a fuel/oil heat
exchanger.
OPERATION PRINCIPLE
A scavenge pump pumps the oil through the oil filter and the fuel/oil heat
exchanger. A charge pump provides regulated oil supply pressure to the
users. The engine fuel flow regulates the IDG oil temperature through
the fuel/oil heat exchanger.
COLD CONDITIONS
In cold conditions, due to the high oil viscosity, the oil pressure increases,
the cooler bypass valve opens; oil runs in the IDG internal circuit. As the
oil warms up, the cooler bypass valve closes and the oil flows through
the fuel/oil heat exchanger.
FILTER CLOGGED
A clogged filter indication is provided by a local visual Delta Pressure
pop-out Indicator (DPI). In case of clogging indication, a DPI reset can
be done in some conditions and associated with maintenance procedures.
When the filter is clogged, the relief valve opens.
TEMPERATURE AND PRESSURE MONITORING
For overheat detection, oil temperature sensors monitor the temperature
of both input and output oil. A pressure switch operates in the event of
a loss of charge oil pressure.
The Integrated Drive Generator (IDG) oil cooling system consists of a
self-contained oil circuit and a fuel/oil heat
exchanger.
OPERATION PRINCIPLE
A scavenge pump pumps the oil through the oil filter and the fuel/oil heat
exchanger. A charge pump provides regulated oil supply pressure to the
users. The engine fuel flow regulates the IDG oil temperature through
the fuel/oil heat exchanger.
COLD CONDITIONS
In cold conditions, due to the high oil viscosity, the oil pressure increases,
the cooler bypass valve opens; oil runs in the IDG internal circuit. As the
oil warms up, the cooler bypass valve closes and the oil flows through
the fuel/oil heat exchanger.
FILTER CLOGGED
A clogged filter indication is provided by a local visual Delta Pressure
pop-out Indicator (DPI). In case of clogging indication, a DPI reset can
be done in some conditions and associated with maintenance procedures.
When the filter is clogged, the relief valve opens.
TEMPERATURE AND PRESSURE MONITORING
For overheat detection, oil temperature sensors monitor the temperature
of both input and output oil. A pressure switch operates in the event of
a loss of charge oil pressure.
Post a Comment