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AVIONICS FLIGHT CHECKS-continued - TM-1-1510-223-MTF0149
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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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Lightning Sensor System (LSS)
TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
using the following procedure:
(a) Altitude - 10,000 feet AGL.
(b) Range switches - Set range to
100 NM.
(c) TILT control - Adjust until a
fairly solid band of ground
clutter is visible.
(d) Radar receiver GAIN control -
Pull to select variable gain.
Observe that VAR is observed
on radar display.
(e) RCT  pushbutton  switch  -
Depress four times within four
seconds. Observe that VAR is
not displayed. This puts the
unit  in  roll  compensation
mode.
(f)
RCT  pushbutton  switch  -
Depress once more. Verify
that VAR is not displayed. If it
is, repeat this step.
(g) Manual GAIN control - Adjust
until ground clutter display is
symmetrical.
NOTE
Do not touch manual GAIN control once display
is adjusted properly
(h) RCT  pushbutton  switch  -
Depress four times within four
seconds to exit the
4-25

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