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 TM 55-1510-218-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
g. Pilot's or copilot's HSI MLS
pushbutton switch-indicator
(instrument panel) - Depress
on. Check illuminated.
h. Fly an MLS approach moni-
toring azimuth (localizer) and
elevation (glideslope) indica-
ton for proper function.
K20-26
*11. ADF radio set (DF 203).
Check as follows:
a. Mode selector switch - ANT.
Tuning meter and frequency
indicator should be illuminat-
ed. Allow sufficient time for
warm-up.
b. Range switch - Set to 190 to
400 kHz range.
c. Tune control - Tune in a sta-
tion and peak the tuning me-
ter.
d. Frequency dial - Note reading
under hairline.
e. BFO switch - BFO.
f. Tune control - Adjust for zero
beat. The frequency dial
should read the same as in
step d.
g. BFO switch - Off.
h. Tune in a low frequency sta-
tion on each of the other
bands (400 to 850 and 850 to
1750 kHz) to ensure that
4-26
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