TM 55-1510-219-MTF
a.
Defective course deviation indicator.
b.
Defective course deviation indicator switching relay.
K20.
ADF radio set inoperative.
a.
No power to ADF radio set.
b.
Defective ADF receiver.
c.
Defective ADF control unit.
K21.
No ADF audio heard in headsets and tuning meter does
not deflect.
a.
Defective ADF receiver.
b.
Defective ADF control panel.
c.
Defective ADF sense antenna.
d.
No power to ADF radio set.
K22.
Radio magnetic indicator does not indicate magnetic
bearing to station with single or double needle switch set
to ADF.
a.
Defective ADF receiver.
b.
Defective RMI.
c.
Defective ADF fixed-loop antenna.
d.
Defective ADF-VOR switch on RMI.
e.
Defective ADF control panel.
K23.
ADF single needle pointer does not return to station
bearing.
a.
Defective RMI.
K24.
Quality of ADF reception is poor.
a.
Defective ADF control panel.
b.
Defective audio control panel.
c.
Defective ADF receiver.
K25.
Heading on course deviation indicator does not agree
with magnetic compass heading of aircraft (corrected for
compass deviation).
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