Leerjet 35/36 Developed for Training Purposes 4C-13
February 1998
Environmental Systems
On S/N 35-107, 113 and subsequent; 36-032 and subse-
quent, the emergency pressurization valves automatically
route LP engine bleed air into the cabin to maintain cabin alti-
tude.
Emergency pressurization can be activated in three ways (one
manually; two automatically). Manually, it is activated by plac-
ing the bleed air switches in EMER; it activates automatically
by an electrical system failure or by the aneroid switches as
cabin altitude passes 9,500 ±250 ft. The emergency pressur-
ization valves reset at 8,300 ft.
When the emergency pressurization valves open, LP bleed air
is routed into the cabin. With this event, windshield, wing, and
stabilizer anti-ice bleed air is not available.
Freon Air Conditioning
A Freon-charged refrigeration system provides ground cooling,
in-flight cooling at lower altitudes, and cabin dehumidification. A
GPU or an engine-driven generator must be used to power the
system.
The COOL/FAN switch on the copilot’s lower panel controls the
operation of the cooling system. The cabin blower can operate
independently of the cooling system by placing the cooling sys-
tem switch in FAN.
Auxiliary Heating System
An electric auxiliary cabin heater in the cooling system ducting
provides additional heating for the cabin. The heater operates
independently of the engine bleed air system and must be pow-
ered by a GPU or an engine-driven generator. The cooling duct
diverter doors must be fully closed for proper operation.
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