TM 55-1510-221-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
a.
Mode C switch (transponder control panel) - ON.
b.
Contact ground radar facility and request them to give
you their altitude readout. Ground facility altitude
readout must agree with aircraft altitude within ±200
feet.
*14
Radar set - Check while airborne
K31-40
as follows:
a.
Function switch - TEST (information will appear after
time delay period).
b.
BRT control - As required.
c.
MODE switches - As required.
d.
RANGE switches - 80.
e.
120/60° degree button - 120
.
f.
Screen - Verify proper display. Test display consists of
two green, two yellow bands, and a red band on a 120°
scan. The word TEST will be displayed in upper right
corner. Operating mode selected by MODE switches
(either MAP, WX, or WXA) has been displayed in lower
left corner If WXA has been selected, red band in the
test pattern will flash on and off. The range will be
displayed in upper right corner beneath the word TEST
and appropriate range mark distances will appear
along right edge of the
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