TM 55-1510-215-MTF
K16. Cannot establish FM two way communication (frequency hop
mode).
a.
Incorrect fill register data.
b.
Incorrect time/date reference in radio set.
K17. No voice security alarm tone heard in headsets.
a.
Defective voice security computer.
b.
Defective voice security receiver-transmitter (UHF or FM).
K18. Voice security alarm tone still audible with microphone
button depressed.
a.
Defective voice security computer.
b.
Defective receiver-transmitter (UHF or FM).
K19. Quality of secure transmitted or received signals inadequate.
a.
Defective voice security computer.
b.
Defective receiver-transmitter (UHF or FM).
c.
Defective audio control panel.
K20. Copilot's RMI does not agree with pilot's RMI within two degrees.
a.
Defective RMI.
b.
Defective compass set.
K21. ADF heading on pilot's HSI course-indicator does not agree
with corrected magnetic reading of aircraft deviation.
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