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 TM 55-1510-218-MTF
TROUBLESHOOTING
PROCEDURE
REFERENCE
e. Fly aircraft within line of
sight of interrogating stations.
f. Contact the facility by radio
and request that the aircraft
be interrogated and that the
reply be checked for satisfac-
tory response.
*17. Encoding altimeter.
Check as follows:
a. Mode C switch (transponder
control panel) - Check on
(up).
b. Contact ground radar facility
and request them to give you
their
altitude
readout.
Ground facility altitude read-
out must agree with aircraft
altitude within 200 feet.
K30-39
18. Radar set (RDR 1200).
Check while airborne as follows:
NOTE
During the first five seconds after turning
the system on, a distinct noise and/or vibra-
tion may occur in the antenna. This is the
normal sound of the stepping drive motor
waiting for the strobe line to catch up for
synchronization.
a. Turn on procedure: Mode
switch - TEST.
b. Initial control settings:
(1) Wx/GAIN control - Wx.
4-35
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