4H-10 Developed for Training Purposes Leerjet 35/36
February 1998
CAE SimuFlite
All configurations incorporate two low-limit and two high-limit
thermoswitches that monitor the temperature of the air in the
nozzles. On the ground, if any of the four thermoswitches
detect a temperature that reaches its limit, power is removed
from the overheat shutoff valve, which closes, and airflow to the
windshield is stopped. Should this occur, the red WSHLD OV
HT light illuminates and the green WSHLD HT light extin-
guishes.
When the thermoswitch cools, the system is reset, the overheat
shutoff valve opens, and the airflow to the windshield resumes.
Also, the red WSHLD OV HT light extinguishes and the green
WSHLD HT light illuminates.
In flight, the low-limit thermoswitches are disabled. However, if
either of the high-limit thermoswitches detects an overheat, the
same sequence of events described previously occurs.
Radome and Windshield Alcohol
Methanol protects the radome and serves as a backup for the
pilot’s windshield bleed air system.
On S/N 35-002 to 106, 108 to 112, and 36-002 to 031 when
the system switch is set to RADOME, a motor-driven pump
supplies methanol from a 2.2 gallon reservoir to the radome at
a constant rate of flow. A normally closed shutoff valve pre-
vents any methanol from reaching the pilot’s defog nozzle. If
the normal defog system malfunctions, selecting WSHLD/
RADOME allows methanol to flow to the radome and energizes
(open) the shutoff valve, which results in methanol flow to the
pilot’s defog nozzle.
A low-pressure switch in the radome alcohol line actuates
when the alcohol supply is depleted or when the pump mal-
functions. The actuated switch completes a ground to illumi-
nate the amber ALCAI annunciator.
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