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 TM 55-1510-218-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
(3) Listen to the time tick,
tone, or voice announce-
ments. The tone is prefer-
able. While listening, al-
ternately switch from
USB to LSB. The signal
should have the same
pitch in both modes. If
there is a difference, in-
form maintenance person-
nel.
*10. Microwave landing system (MLZ-
910).
Check as follows:
a. Avionics master switch (over-
head control panel) - ON.
b. MLS receiver audio switch
(audio control panel) - On
(up).
c. Off. volume control - Turn
clockwise out of detent. then
continue turning clockwise
until desired audio volume is
reached.
d. Test switch - Depress and ob-
serve that all indicator lights
illuminate and that self-test
procedure takes place as fol-
lows:
(1) All MLS controller indica-
tor lamps will remain illu-
minated and all three dig-
ital displays will read all
8's for as long as the
4-24
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