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 TM 55-1510-218-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
o. Mode selector switch - ADF.
The bearing pointer should
rotate 180 and again indicate
the magnetic bearing to sta-
tion.
p. Distance range (ADF) - Check
as follows.
(1) Mode selector switch -
ADF.
(2) Tune control - Tune sta-
tions to determine operat-
ing range of direction
tinder. End of effective
operating range may be
considered to be reached
when the RMI bearing
needle fails to return to
within three degrees of
starting bearing when
loop is stewed first clock-
wise and then counter-
clockwise.
*12. ADF radio set (KDF-806).
K20-26
Check as follows:
a. Avionics master switch (over-
had control panel) - ON.
b. Off, volume, test knob - Turn
clockwise out of detent, then
depress to turn off automatic
squelch circuit. Continue
turning knob clockwise until
background noise is heard in
headphones or speaker. assur-
ing that receiver is operating,
then set audio volume to de-
4-28
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