Eclipse 500 System Manual page 213

Section 9. Climate Control
9.5 System Description
9.5.1 Bleed Air Supply System (BASS)
GENERAL
High pressure engine bleed air from a P3 bleed port is used by the climate control
and pressurization system. High pressure bleed air from the P3 bleed air port is the
source of fresh air for the aircraft.
Before the bleed air can be used for pressurization and climate control it must be
cooled. Bleed air from both sources is routed through a bleed air heat exchanger and
bi-level flow control valve located in each engine pylon and then through bleed air
muffler ducts to the Cabin Air Distribution Sub-System.
Bleed Air Heat Exchangers
A bleed air heat exchanger located in each pylon regulates bleed air temperature
based on the demand for cockpit and cabin heating or cooling. There are two
sources of airflow through the bleed air heat exchanger used for cooling the high
pressure bleed air from the engine, ram air and fan air.
During ground operations there is not enough ram air pressure for cooling, so low
pressure fan bleed air is used. The low pressure fan bleed air is routed through
a fan air control valve to the heat exchanger. A variable ram exhaust outlet
modulates the amount of fan air over the heat exchanger to condition the bleed
air as required by the climate control system.
During flight operations the fan air control valve is closed and ram air flows over
the heat exchanger through an inlet duct on the top of each engine pylon. The
variable ram exhaust outlet modulates the amount of ram air over the heat
exchanger to condition the bleed air as required by the climate control system.
Version 2.0 April 2007
Figure 124. Pylon Bleed Air Schematic
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Eclipse 5OO Systems Manual
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