TM106601_(7/01) 2-
17
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(5) Note that RT FAULT appears in the fault field on the MFD display. The word TEST should
appear in the mode field on the MFD display. The test pattern should appear on the display
within 100 seconds. Adjust BRT control on the MFD display as required.
Note
+
The width of the test pattern bands is not
critical, nor is the position of the bands relative
to the range marks.
(a) Check that the test pattern displays five colored bands. Starting with the closest band to
the origin, the bands will be green, yellow, red, yellow, and green. The red band
represents the most intense level. All range marks will be visible and displayed in blue
letters.
(b) Observe the update action as a small "ripple" moving along the outer green band,
indicating that the antenna is scanning the full 120°.
Note
+
Basically, the test pattern can be thought of as
a weather target. Therefore, when in the TEST
mode and switching through the ranges, the
test pattern position will be altered on the
screen.
(6) Change the range to 2 miles. The test pattern will be beyond the area being scanned. Increase
the range, one step at a time and observe that the test pattern appears in the correct ranges.
Observe that the proper range marks appear in the display.
(7) Rotate the Function Select Switch on the Radar Control Panel to the STBY position, then taxi
the aircraft to a clear-ahead area where metal buildings, aircraft, etc., are not in the line-of-
sight. Observe the warning at the beginning of paragraph 2.7.
(8) Rotate the Function Select Switch on the Radar Control Panel to the ON position. Use WOW
override if WOW is installed. The display will automatically be in the WX mode.
(9) Adjust the TILT control up (+ degrees) in small increments until a clear picture develops of any
local weather. Close-in ground targets may also appear in the display. A +15°, no ground
target should appear on the display.
(10) Repeat TILT control adjustment to check remaining ranges.
(11) Sequentially change the modes through SR1, SR2 and SR3. Observe that for each mode
selected, SRCHl, SRCH2, or SRCH3 appears in the mode field on the MFD display, and for
each mode the fault field remains off. Example: if in SR1 mode, the display should show
"SRCHl".
(12) Set the mode to SR1 and the range to 20. Observe that the four range marks are identified.
Index range selector to 20, 10, 5, 2, 1, and .5 NM and note that the range marks are identified
properly in each range.
