TM 55-1510-219-MTF
PROCEDURE TROUBLESHOOTING REFERENCE
F.
AVIONICS FLIGHT CHECKS (CONT)
f.
Latitude and longitude position - Check as follows:
(1)
Data selector - L/L POS.
(2)
Displays - Read present position latitude in the left-
hand display and present position longitude in the right-
hand display. Both display indications are to a tenth of
a minute.
(3)
HOLD key - Depress. Key will illuminate. Latitude and
longitude displays will freeze at the values which were
present when the HOLD key was depressed.
NOTE
While the HOLD key is illuminated, TA-CAN and data
link updates are prohibited.
g.
Latitude and longitude inertial position - Check as follows:
Data selector - L/L WYPT (HOLD key should still be
illuminated).
(1)
Left-hand and right-hand displays - Read latitude and
longitude of present position to a tenth of a degree.
Compare with values noted in latitude and longitude
position check above.
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