TM 55-1510-215-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
k.
TIME button - Press then check that
correct day is displayed; press again and
check for correct hours and minutes, then
a third time and check for correct minutes
and seconds.
1.
Frequency - Select operating frequency
(or channel) of an FM station of known
bearing.
m.
MODE selector - HOM.
n.
HSI select switch panel (instrument panel)
- HOME.
o.
HSI (instrument panel) Observe bearing
to station displayed on course pointer and
signal strength displayed on glideslope
deviation indicator.
p.
When possible, check
K16
frequency-hop (FH MODE) operations for loud
and clear communications.
*18. UHF/FM voice security sets
(TSEC/KY-58) - Check as follows:
a.
Ensure associated radio set (FM liaison,
17. above, or UHF command, 13.
above) is operable.
b.
MODE switch (voice security set) - C
(cipher).
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