ADF radio set inoperative.

TM 55-1510-218-MTF

b. Defective course deviation indicator switch-

K20. ADF radio set inoperative.

a. No power to ADF radio set.

K21. No ADF audio heard in headsets and tuning me-

ter does not deflect.

a. Defective ADF receiver.

b. Defective ADF control panel.

c. Defective ADF sense antenna.

K22. Radio magnetic indicator does not indicate mag-

netic bearing to station with single or double

needle switch to ADF.

a. Defective ADF receiver.

b. Defective RMI.

c. Defective ADF fixed-loop antenna.

d. Defective ADF-VOR switch on RMI.

c. Defective ADF control panel.

K23. ADF single needle pointer does not return to sta-

tion 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).

a. Defective gyro compass set.

b. Incorrect compass deviation card.

K26. Copilot's radio magnetic indicator heading does

not agree with pilot's radio magnetic indicator

heading within two degrees.

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