after the switch is turned on while on the
ground and for 1 minute in flight. The red
“WING OVHT” or red “STAB OVHT” CAS
message will be displayed if the correspond-
ing surface is in excess of the temperatures
shown in Figure 10-6.
The controller also monitors sensor inputs for
validity. If a wing sensor has failed or the high
or low temperature sensor input is invalid, a
“WING TMP FAULT” CAS message will be
displayed. If a stabilizer sensor has failed or
the high or low temperature sensor input is in-
valid, a “STAB TMP FAULT” CAS message
will be displayed. Wing and stabilizer anti-ice
should still function normally with either fault
message displayed.
The wing/stab anti-ice system is tested by ro-
tating the airplane system test selector knob
to the “ANTI-ICE” position, and depressing
the push-to-test button. This test checks the cir-
cuits that supply the discreet inputs to the
ECS controller. A white advisory message,
“WG/STAB HT OK” is displayed on the CAS
for a satisfactory test. The red WING OVHT
and STAB OVHT annunciators on the CWP
also illuminate with this test.
Wing/Stab Anti-Ice Leak Detector
Ducting for the wing and stabilizer anti-ice
bleed-air is monitored by a leak detection sys-
tem. It is a series of interconnected heat de-
tection elements connected to a leak detector
unit. The system works the same as the engine
fire detection system. The heat detecting ele-
ments are routed beside the anti-ice ducting
from the wing leading edge, aft, and up through
the vertical stabilizer to the leading edge of the
horizontal stabilizer (Figure 10-6). A bleed-
air leak or overtemperature (approximately
255° F) anywhere along the heat detection el-
ement causes the red “WING/STAB LEAK”
message to be displayed on the CAS and the
WING/STAB LEAK annunciator on the CWP
to illuminate. These warnings remain on until
the temperature decreases. The flight manual
10-11
FOR TRAINING PURPOSES ONLY
LEARJET 45 PILOT TRAINING MANUAL
FlightSafety
international
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