4C-10 Developed for Training Purposes Leerjet 35/36
February 1998
CAE SimuFlite
Bleed Air Conditioning System
Conditioned air is the result of engine bleed air routed through
a heat exchanger and distributed to the cabin and cockpit
through ducting. Cabin heating and cooling is accomplished by
controlling the amount of bleed air allowed to bypass the heat
exchanger by the hot air bypass valve (i.e. ‘H’ valve).
On aircraft (S/Ns 35-002 to 081, 083 to 086; 36-002 to 022),
with the BLEED AIR switches on and the cabin air switch set to
NORM, engine bleed air is routed through the flow control valve
to the heat exchanger. The cooled air is then routed through
ducts to the cabin.
On aircraft (S/Ns 35-082, 087 to 106, 108 to 112; 36-023 to
031), engine bleed air is routed directly to the heat exchanger
where it is precooled in the heat exchanger by the passing ram
air from the dorsal inlet. The precooled air is then routed
through the flow control valve and venturi into the cabin.
On aircraft (S/Ns 35-107, 113 and subsequent; 36-032 and
subsequent), with the BLEED AIR switches on and with the
cabin air switch in ON, engine bleed air is admitted through the
flow control valve to the heat exchanger. The engine bleed air
is precooled in the heat exchanger by passing ram air through
the heat exchanger from the dorsal inlet.
The temperature control system regulates the amount of hot
bleed air necessary to maintain the desired temperature. The
temperature control indicator in the cockpit shows H-valve posi-
tion relative to full hot and full cold. With the BLEED AIR
switches in EMER, temperature control is unavailable.
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