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PILOT'S OPERATING HANDBOOK
SUPPLEMENT
WEATHER RADAR (X-BAND)
(TYPE RDR-160)
PREFLIGHT CHECKS WITH RADAR ENERGIZED:
1.
2.
3.
4.
5.
6.
7.
I
WARNING
I
IN ORDER TO PREVENT POSSIBLE BODILY INJURY
TO GROUND PERSONNEL OR IGNITION OF FLAMMA-
BLE OR EXPLOSIVE MATERIALS, THE AIRPLANE
MUST BE TAXIED WITH THE FUNCTION SWITCH IN
THE OFF, STBY, OR TEST POSITIONS ONLY TO A
"CLEAR-AHEAD"
AREA WHERE METAL BUILDINGS,
AIRCRAFT, GROUND PERSONNEL, ETC., ARE NOT IN
THE LINE-OF-SIGHT OF THE RADAR UNIT. OBSERVE
THE SAFETY PRECAUTIONS AND INSTRUCTIONS AT
THE START OF SECTION 4 PRIOR TO PERFORMING
THE FOLLOWING CHECKS WITH THE RADAR UNIT
ENERGIZED.
Ensure safety precautions have been observed.
Function Switch -- 40
position.
Observe that the numbers
"40-10"
are
present in the alphanumeric area of the display.
HOLD Selector Switch
--
DISENGAGED (scan position).
Mode Selector -- Wx position. Observe that letters
"Wx"
are
present in the alphanumeric
area
of the display.
TILT Control
+4°
to minimize ground return.
BRT Control -- ADJUST as
required.
Antenna Tilt Control ~-TILT UP(+ degrees)
and
DOWN (- degrees)
in
small increments. Close-in ground targets should
appear
on the
display at low tilt angles
and
any local moisture laden weather
should appear at higher angles.
OPERATIONAL NOTES
ALTITUDE RING DISPLAY
1.
Some energy is radiated peripherally from the radar
antenna
which,
under some atmospheric conditions, will create
a
false
return on the radar screen when the display is set on the
5,
10, or 20
mile ranges. The false return will usually be most prominently
displayed at
approximately
2 miles from the origin when flying at
altitudes
near 12,000 ft. However, under certain atmospheric
,.-.,
conditions, the false return can still be observed at a distance from
the origin approximately equivalent to the airplane's
altitude.
Care must be taken not to confuse this normal interference return
with a weather return. This
i
s best
accomplished
by using the
longer distance displays ( 40 or more) for early detection of signifi-
cant weather.
7
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