TM 1-1510-225-10
3A-113
returns when closely examining weather targets below
the aircraft flight level, select the shortest range that
allows full depiction of the area of interest.
e. En Route Weather Detection Operation.
To set the antenna tilt to optimize the radar's ability to
identify significant weather follow these steps:
1. Wx push-button mode selector switch –
Press.
2. Range switches – Select 40 or 80 nautical
mile range.
3. TILT control – Adjust down until entire
display is filled with ground returns.
4. TILT control – Slowly raise antenna so
that ground returns are pointed on about
the outer one third of the indicator area.
5. Display – Watch strongest returns. If, as
they
are
approached,
they
become
weaker or fade out after working back
inside the near limit of the general ground
return pattern, they are probably ground
returns or insignificant weather. If they
continue strong after working down into
the lower half of the indicator, you are
approaching a hazardous storm or storms
and should deviate.
6. Display – Examine the area behind strong
targets. If radar shadows are detected
you are approaching a hazardous storm or
storms and should deviate. Regardless of
the aircraft's altitude, if weather is being
detected, move the antenna tilt control up
and down in small increments until the
return object is optimized. At that angle,
the most active vertical level of the storm
is being displayed.
f. Ground Mapping Mode. Ground mapping
mode is selected by pressing the GND MAP push-
button mode selector switch. The TILT control is then
used to tilt the antenna down until the desired amount
of terrain is displayed. The degree of tiltdown will
depend upon the aircraft altitude and the selected
range
g. Fault Monitoring. Critical functions in the
receiver/transmitter/antenna
are
continuously
monitored.
3A-32. LIGHTNING
DETECTION
SYSTEM
(WX-1000E).
The lightning detection system is to be
used for hazardous weather avoidance, not
weather penetration.
The lightning detection system is used to detect
and locate areas of lightning activity within a
100 nautical mile radius around the aircraft. The
system provides the operator with a visual display of
the position and rate of occurrence of the lightning
activity on the EHSI. The lightning detection system
detects
both
visible
and
high
energy
invisible
electromagnetic
and
electrostatic
discharges
(lightning) indicating areas of turbulent activity. After
evaluating the lightning display, and its relation to
precipitation as indicated by the weather radar display,
the operator can effectively plan the proper course to
avoid hazardous weather. The lightning detection
system consists of a receiver/processor, an antenna, a
mode selector pushbutton switch (located on the radar
control panel), a control switch (located on the audio
control panel), the pilot's and copilot's EHSI, and the
multi-function display (MFD). The system is powered
by
a
2-ampere
circuit
breaker,
placarded
STORMSCOPE, located on the right sidewall circuit
breaker panel, Figure 2-6. Because the system is a
passive device (it does not transmit), it can be
operated safely on the ground. Weather in all
directions around the aircraft may be monitored, even
before starting engines.
a. Lightning Detection System Controls and
Functions.
(1) Lightning
Detection
System
Control
Switch. The lightning detection system control switch,
placarded STORMSCOPE OFF / ON / CLEAR,
located on the audio control panel, controls operation
of the lightning detection system. The OFF and ON
positions remove and apply power to the system. The
CLEAR position is a momentary position that clears all
thunderstorm information from the display.
(2) Lightning
Display
Push-Button
Mode
Selector Switch. The lightning display push-button
mode selector switch, placarded with a lightning bolt,
is located on the radar control panel. Pressing this
switch selects or deselects lightning information for
display on the EFIS or MFD.
WARNING
