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WU-660 WEATHER RADAR CONTROL PANEL
Figure 5-20
Pilot’s Manual
5-78 PM-132A
• WX (weather) — selects the weather radar main operating
mode.
• GMAP (ground map) — in the ground mapping mode, the
system internal parameters are set to enhance returns from
ground targets.
• FP (flight plan) — selecting this position places the radar in the
flight plan mode.
• TST (test) — when this mode is selected the weather depiction
will be a special colored test pattern to allow verification of system
operation.
Power is provided to the RTA and cockpit controller from the right
avionics main bus with a 7.5-amp circuit breaker located in the
INSTRUMENT/INDICATIONS group of the copilot’s circuit breaker
panel.
AVIONICS COOLING
INSTRUMENT PANEL COOLING
The instrument panel cooling system is located forward of the throttle
quadrant and is provided to draw flight deck ambient air through the
instrument panel and thus prevent overheating of avionics displays
and instruments. The system consists of an avionics cooling fan, an on/
off thermostat switch and an overtemperature thermostat circuit. The
avionics cooling fan is activated when the temperature sensing switch
reaches 90° F (32° C). The fan automatically turns off when the temperature
has been reduced below 70° F (21° C). If the temperature reaches
an extreme of 135° F (57° C) the overtemperature circuit is energized
and an annunciation is posted on the CAS. The CAS remains displayed
until the temperature has been reduced to 125° F (51.7° C).
The following CAS illumination is specific to the avionics cooling system:
The instrument panel cooling system is powered from the L MAIN bus
and protected by the INSTR FAN 3-amp circuit breaker located on the
pilot’s circuit breaker panel (ENVIRONMENTAL group).
CAS Color Description
INSTR PNL TEMP White The temperature at the instrument panel is
higher than normal.
Pilot’s Manual
PM-132A 5-79
MISCELLANEOUS
COCKPIT VOICE RECORDER (CVR)
A solid state Cockpit Voice Recorder (CVR) is installed in the Learjet 40.
The standard CVR is a three-channel unit providing 30 minutes of
recording. An optional unit is available which provides 120 minutes of
recording. Two of the channels are used to record pilot and copilot
audio. The third channel is used for the area microphone. Located in
the tailcone, the CVR is painted international orange with reflective
tape added to aid in recovery following a mishap. It also has an underwater
locator beacon installed on one end of the unit. The recording is
converted to a digital format and stored in crash protected memory.
The area microphone is located in the upper center area of the instrument
panel. An erase button and headphone jack are located on the
CVR panel just beneath the copilot audio control panel. The CVR performs
a self-test at power-up and has a continuous self monitor. If a
fault is detected at any time, an annunciation is posted on CAS.
The following CAS illumination is specific to the CVR:
The erase function is initiated by pressing the erase button on the CVR
panel. An interlocking device only allows this function to work when
the airplane is on the ground and parking brake is set. When erase function
is complete, a three-second tone is output to the headphone jack.
Voice recorder system power is 28-vdc supplied through a 3-amp CVR
circuit breaker located on the pilot’s circuit breaker panel (INSTRUMENTS/
INDICATIONS group).
CAS Color Description
CVR FAIL White The cockpit voice recorder has failed.
Pilot’s Manual
5-80 PM-132A
CLOCKS
Each instrument panel is equipped with a multi-function chronometer
to display GMT, local time (LT), flight time (FT), and elapsed time (ET).
The SEL button selects what is to be displayed and the CTL button controls
what is being displayed (Figure 5-21). Pressing SEL sequentially
selects GMT, LT, FT or ET for display. FT starts counting when the main
gear weight-on-wheels switches transition to the air mode and stops
counting when they transition back to ground mode. The CTL button
resets FT back to zero when held down for three seconds. ET is started
and reset when the CTL button is pushed momentarily. Depressing the
SEL and CTL buttons simultaneously enters the set mode and GMT or
LT can be set. The CTL button is then pressed to increment the flashing
digit to the desired value. Pressing the SEL button enters that value and
toggles to the next digit to be set.
Power for the chronometers is 28-vdc supplied through a 1-amp L and
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