TM 55-1510-222-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
G. AVIONICS FLIGHT CHECKS (CONT)
NOTE
The first digit from the left indicates " 1" for
NAV mode. The second and third digits will
be blank unless a malfunction code is indi-
cated. The fourth digit is used for stored
heading and shall be blank. The fifth digit is
decremented at certain time intervals when
using TACAN update. This provides an in-
dication of the relative quality of position
updating obtained. The sixth digit indicates
operating mode and will read “4” to indicate
TACAN updating.
(4) If malfunction codes oc-
cur, press and release the
TEST switch repeatedly.
recording all malfunction
codes until the second
and third digits again in-
dicate an action or code.
or go blank. Refer to TM
55-1510-222-10 for code
definitions.
(5) WARN lamp - Check
dim.
m. UTM Position - Check as fol-
lows:
(1) Data selector - UTM
POS.
(2) Left-hand display - Read
northing in kilometers.
(3) Right-hand display - Read
zone. then easting in kilo-
meters.
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