Leerjet 35/36 Developed for Training Purposes 4H-9
February 1998
Ice and Rain Protection
Windshield Anti-Ice
Windshield anti-ice operations can be controlled in either the
Automatic or Manual modes.
On S/N 35-002 to 081, 083 to 086 and 36-002 to 022 without
AMK 76-7, engine bleed air is directed through ducting and
control valves to external outlets forward of the windshield.
With the WSHLD HEAT ON/OFF switch in ON and the AUTO/
MAN switch in AUTO, hot bleed air from the bleed air manifold
flows through a fully open shutoff valve. It then continues
through the windshield overheat shutoff valve. In MAN, the
shutoff valve can be fixed at any desired setting by manipulat-
ing the WSHLD ON/OFF switch. Pulling the IN NORMAL/OUT
DEFOG knob positions the manual control valve to direct
engine bleed air to the external outlets or foot warmers.
S/N 35-082, 087 to 106, 108 to 112; 36-023 to 031; prior air-
craft with AMK 76-7, precooled engine bleed air is directed
through ducting and control valves to the external outlets for-
ward of the windshield. Operation of the system is the same as
earlier aircraft (see above description).
S/N 35-107,113 and subsequent and 36-032 and subse-
quent, precooled engine bleed air is directed through ducting
and control valves to the external outlets forward of the wind-
shield. Control is with a three position switch labeled ON/
HOLD/OFF. Holding the switch in the ON position drives a
motor-operated shutoff valve toward the fully open position,
allowing bleed air into the anti-ice heat exchanger, and illumi-
nates the green WSHLD HT light. Moving the switch to the
HOLD position stops the motor, and the valve stays in its last
position. Placing the switch to the OFF position drives the shut-
off valve to the fully closed position, and the WSHLD HT light
extinguishes.
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