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bus will power the right windshield panel.
Normal system operation is indicated by illumination of the L and R
WS DEFOG annunciators when the system is activated (windshield
temperature below 80°F [27°C)). When the windshield is heated above
80°F (27°C), the annunciators will extinguish .
PM-121
Change 3 6-9
Pilot's Manual
Learjet 31A
L AND R WS DEFOG ANNUNCIATORS
Illumination of a WS DEFOG annunciator, located on the glareshield
annunciator panel, indicates an over-temperature condition, undertemperature
condition or loss of AC or DC power. Normal operating
temperature of the windshield is between 105°F (41°C) and 120°F
(49°C). Temperature sensors are attached to each windshield panel
which provide temperature data to the windshield heat control unit.
Should the temperature of the windshield drop below 80°F (27°C), the
applicable WS DEFOG annunciator will illuminate to alert the crew
Should the temperature of the windshield increase above 150°F (66°C),
the applicable WS DEFOG annunciator will illuminate and the affected
windshield will be deactivated . When the windshield cools to the normal
operating range, the system will reactivate and the WS DEFOG annunciator
will extinguish Electrical faults detected by the system
monitor will cause the affected WS DEFOG annunciator to illuminate.
LWSHLD
R WSHLD DEFOG
DEFOG
WSHLD
DEFOG
183 VAC IN
OFF
WINDSHIELD DEFOG SYSTEM
Figure 6-3
6-10
PM-121
Change 3
Learjet 31A
Pilot's Manual
WINDSHIELD AND RADOME ANTI-ICE - ALCOHOL SYSTEM
The alcohol anti-ice system is utilized for radome anti-ice protection
and for windshield anti-icing in the event of a windshield heating system
malfunction. Alcohol anti-icing is accomplished by directing methyl
alcohol over the pilot's windshield surface through an external outlet
in the windshield heat outlet nozzle assembly and through an outlet
nozzle assembly on the radome. The system consists of a 1.75 gallon
(6.6 liter) alcohol reservoir, a float switch, a filter, a relief valve, a threeway
control valve, a bleed air shutoff and pressure regulator valve, a
system switch, an amber ALC LOW caution light, and associated aircraft
wiring . The pressure relief valve is installed to prevent system
overpressurization by venting system pressure greater than 2.6 psi
(17.9 kPa) above ambient, and bleed system pressure when the system
is off. The system control circuits operate on 28 VDC supplied through
the 5-amp ALC SYS circuit breaker on the copilot's circuit breaker
panel.
ALCOHOL SWITCH
The alcohol anti-ice system is controlled by the three position ALCOHOLswitch
on the center switch panel. When the switch is set to WS/
RAD, circuits are completed to open the shutoff and pressure regulator
valve and position the three-way control valve for alcohol flow to the
windshield and radome. The alcohol reservoir, pressurized to approximately
2.4 psi (16.5 kPa) above ambient through the shutoff and pressure
regulator valve, supplies alcohol to the windshield outlet and
radome nozzles through a filter and the three-way control valve. When
the switch is set to RAD, the three-way valve will position to supply alcohol
flow to the radome only. When the switch is set to OFF, the shutoff
and pressure regulator valve will close, the three-way valve will
reposition to cut off flow and system pressure willbleed off through the
pressure relief valve.
ALC LOW CAUTION LIGHT
Illumination of the amberALC LOW light, located on the glareshield
annunciator panel, indicates the alcohol supply in the reservoir is low.
The reservoir float switch will illuminate the light through a relay when
in the full down position . When the relay is energized, a holding circuit
is also energized to prevent the light from flickering due to the bobbing
motion of the float. The holding circuit is deenergized when the BATTERY
switches are set to OFFand the alcohol reservoir is filled . Acompletely
filled reservoir will supply the alcohol anti-ice system with
approximately 45 minutes of alcohol flow when providing protection
for both the windshield and radome or approximately 2 hours for radome
only.
PM-121
6-11
Change 3
Pilot's Manual
Learjet 31A
PNEUMATIC AIR PRESSURE
ALCOHOL SUPPLY
OVERBOARD VENT
ELECTRICAL
CHECK VALVE
PRESSURE RELIEF VALVE
ALCOHOL PRESSURE REGULATOR
8 SHUTOFF VALVE
ALCOHOL ANTI-ICE SYSTEM
Roar* 6-4
THREE-WAY VALVE
FILTER
FLOAT SWITCH
JQF
2W
ZO >
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