K14.
K15.
K16.
K17.
K18.
K19.
K20.
TM 55-1510-222-MTF
c. Defective antenna or cabling.
d. Defective marker beacon receiver.
Marker beacon signals not heard in headset.
a. Defective audio control panel.
b. Defective marker beacon volume control or
sensitivity switch on pedestal extension.
Glideslope off flags remain in view when glide-
slope receiver is operating.
a. Glideslope portion of VOR receiver defec-
tive.
b. Defective glideslope antenna or cabling.
c. Defective VOR control panel.
Glideslope flag on one course deviation indicator
remains in view when glideslope receiver is oper-
ating.
a. Defective pilot’s or copilot’s NAV select
switch on instrument panel.
b. Defective course deviation indicator switch-
ing relay.
c. Defective course deviation indicator.
Glideslope indicator on course deviation indica-
tors do not deflect properly.
a. Defective glideslope portion of VOR receiv-
er.
Glideslope indicator on one course deviation in-
dicator does not deflect properly.
a. Defective course deviation indicator.
b. Defective course deviation indicator switch-
ing relay.
ADF radio set inoperative.
a. No power to ADF radio set.
No ADF audio heard in headsets.
a. Defective ADF receiver.
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