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 TM 55-1510-218-MTF
TROUBLESHOOTING
PROCEDURE
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
d. Frequency selector - Set de-
sired frequency.
c. Fly aircraft to a point 40 nau-
tical miles away from test sta-
tion.
f. At 40 nautical miles, main-
tain communication with test
station each 10 while flying a
360 flat turn (nor to exceed
5 bank). Communication
should be uniformly loud and
clear through these tests.
g. Repeat procedure for frequen-
cies in low, middle and high
ranges.
*7.
K8-9
VHF radio set (KTR-908).
Check as follows:
a. Altitude - 1000 feet AGL.
b. Avionics master switch (over-
head control panel) - ON.
c. 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-
sired level. Depress knob
again to return unit to auto-
matic squelch control.
d. Channel pushbutton switch -
As required.
4-18
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