Pilot’s Manual Learjet 60
6-4 PM-123
Change 6
When the Rosemount Ice Detector probe detects an icing condition, and
the STAB WING HEAT switch is Off, the amber ICE DET light located
in the glareshield annunciator panel, and both Master CAUT lights will
illuminate. Probe de-icing is done automatically by the Rosemount sys-
tem itself. Selecting the STAB WING HEAT switch On will inhibit the
amber ICE DET light and enable the white ICE DET light. The ICE DET
white light is an advisory light which will illuminate only when icing
is detected while the STAB WING HEAT switch is On. Illumination of
the ICE DET amber light with the STAB WING HEAT switch On indi-
cates a failure of the Rosemount Ice Detection system.
ICE DETECT LIGHTS
Two ice detect lights are installed on the forward glareshield to indicate
ice or moisture formation on the windshield during night operations.
These lights are illuminated whenever the BATTERY switches are On.
When particles of ice or moisture form, light refraction results in the ap-
pearance of two red areas, approximately 1-1/2 inches (38 mm) in di-
ameter, on the windshield. The light on the pilot’s side is located in a
position covered by the windshield anti-ice airstream. The copilot’s
light is positioned outside the airstream; therefore, the copilot’s wind-
shield must be monitored whenever windshield anti-ice system is in
operation. The red areas indicate ice encounters when the SAT is below
freezing and moisture encounters when the SAT is above freezing. The
lights are supplied 28 VDC through the 2-amp L and R ICE DETECT
LIGHT circuit breakers on the pilot’s and copilot’s circuit breaker
panels respectively.
WING INSPECTION LIGHT
The wing inspection light, located on the right forward fuselage, may
be used to visually inspect the right wing leading edge for ice accumu-
lation during night operations. The light is illuminated by depressing
the WING INSP LIGHT momentary switch. This switch may be located
on the copilot’s switch panel or on the instrument panel adjacent to the
pitch trim indicator. The light illuminates a black dot on the outboard
wing leading edge to enhance visual detection of ice accumulation.
Power is supplied through the 5-amp WING INSP LT circuit breaker on
the copilot’s circuit breaker panel.
ENGINE AND NACELLE INLET ANTI-ICE
The engine and nacelle inlet anti-ice system provides anti-ice protection
for the engine fan spinners, low pressure compressor inner stator,
nacelle inlets, and the engine inlet air temperature and pressure sen-
sors. The fan spinners, low pressure compressor inner stator, and
nacelle inlets are anti-iced by engine bleed air. The fan spinners are
Change 6
To Next Page
Loading...
