TM l-1510-225-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
(f) Contact the facility by radio and
request that the aircraft be inter-
rogated and that the reply be
checked for satisfactory response.
14. Encoding altimeter - Check as follows:
(a) Mode C switch (transponder con-
trol panel) - ON.
(b) Contact ground radar facility and
request facility altitude readout.
Observe that ground facility alti-
tude readout agrees with aircraft
altitude within ±200 feet.
15. Radar set - Check while airborne as
follows:
K17-20
NOTE
Critical functions in the receiver/transmitter/
antenna are continuously monitored.
(a) Radar system mode selector
switch - ON.
(b) Radar receiver GAIN control -
Preset (pushed in) position.
(c) Wx pushbutton mode selector
switch - Depress.
(d) Range switches - Select 40 or 80
nautical mile range.
(e) TILT control - Adjust down until
entire display is filled with
ground returns.
(f) TILT control - Slowly raise
antenna so that ground returns are
pointed on about the outer one
third of the indicator area.
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