TM 55-1510-221-MTF
a.
Defective audio distribution channels.
b.
Defective antenna or antenna cabling.
K8.
Cannot establish VHF two-way communications.
a.
Defective audio distribution channels.
b.
Defective antenna or cabling.
K9. VHF volume control does not affect received audio level.
a.
Defective VHF control panel.
b.
Defective antenna or antenna cabling.
K10. HF transmitted or received signal or sidetone not clear.
a.
Defective HF receiver-transmitter.
b.
Defective antenna cabling.
c.
Defective HF control panel.
d.
Defective audio control panel.
K11. Course deviation indicator NAV flags remain in view with
receiver operating.
a.
No reliable navigation signal on frequency selected.
b.
Defective VOR receiver.
c.
Defective VOR control panel.
d.
Defective antenna or cabling.
e.
Defective NAV switching relays.
K12. Either pilot's or copilot's course deviation indicator NAV
flag remains in view with receiver operating.
a.
Defective pilot's or copilot's VOR switch on instrument panel
b.
Defective course indicator switching relays
c.
Defective course deviation indicator K13. No VOR audio
tone heard in headset.
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