Learjet 35A - Interior Windshield and Passenger Window Defog

[h~lAUBD~11lmm
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ANn-ICE SYSTEMS (CONT)
INTERIOR WINDSHIELD AND PASSENGER WINDOW DEFOG
The windshield interior and passenger windows are normally defogged by
I
normal cabin airflow. On aircraft incorporating AAK 86-1 or
SB 35/36-21-17, additional windshield defogging is provided by the wind-
shield auxiliary defog heat system.
TO PROVIDE ADDmONAL WINDSHIELD DEFOGGING (Aircraft incor-
porating
AAK 86-1 or SB 35/36-21-17):
1. W/S AUX DEFOG HEAT Switch - DEFOG HEAT. This adds
additional
heat to the cabin air nolmally used to defog the wind-
shield
and activates the freon cooling system (below 18,000 feet) to
dehumidify
the cabin air.
-_NOTE ~ With COOL-FAN switch in OFF position, the cool air
, from the freon system is diverted between the cabin
headliner
and the fuselage skin to prevent lowering the
cabin temperature.
2. If operation of the freon cooling system is not desired, W/S AUX
DEFOG HEAT Switch - CKPT.
E~
Power for the windshield auxiliary defog heat. system
must be supplied
by an engine generator or GPU.
I FOR MAXIMUM WINDSHIELD DEFOGGING (Aircraft incorporating
AAK 86-1 or S8 35/36-21-17):
1. Approximately 15 minutes prior to descent, W /S AUX DEFOG
HEAT Switch - DEFOG HEAT.
2. At start of descent:
a. Cockpit Shoulder and Ankle Eyeball Outlets -
Close.
b. Windshield Heat - On.
3. On aircraft incorporating FeN 89-1, at FL350:
a. COOL-FAN Switch - COOL.
-_NOTE ~ Switching the cabin blower switch (on the blower duct
, in the aft cabin) to OFF will divert airflow from the evap-
orator for passenger comfort.
b. Cockpit Air Control- Low.
4. Leave Cabin Air, Windshield Auxiliary Defog Heat and Windshield
Heat on
until shutdown.
2-72
FAA APPROVED 4-30-76
REISSUED 2-25-81, CHANGE 10