TM 55-1510-221-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
(3)
Right display - Check. Display
should read 1--XX4, indicating that
the INS is in the TACAN update
mode
(4)
Data selector (while in flight) - L/L
WYPT or UTM WYPT
(5)
Keys 7 and 9 - Depress
simultaneously. The number of the
TACAN station being used for
navigation shall flash on and off.
(6)
FROM-TO display - Monitor station
selection. Only the number of
stations eligible for mixing will be
displayed. A "0" indicates that none
of the 9 stations are eligible for
update.
NOTE
Mixing will not take place if TACAN station
data is loaded in error or if the ratio of the
distance from the station to the aircraft alti-
tude is less than 2 to 1.
(7)
INS TACAN range display - Monitor
The display shall indicate the range
to the station used for update. If
no station is being used for update,
the display will read all dashes
4-11
