TM 11-5840-281-12-1
OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES
B - BEFORE
W - WEEKLY
ITEM
INTERVAL
ITEM TO BE INSPECTED
EQUIPMENT IS NOT
NO.
B
W
PROCEDURE
READY/AVAILABLE IF:
1
RADAR SET GROUP
Check that radar set group is level.
Radar set group not level.
Bubble level on top of elevation
antenna drive must be centered
2
RECEIVER-TRANSMITTER
Check that air vent cover at bottom
Air vent cover not removed.
is removed.
3
CONTROL-INDICATOR
Perform Preliminary Operating Proce-
Control-indicator fails ppi
dure (para 2-5). Check plan position
orientation check.
indicator (ppi) orientation of video
display to compass rose ring. Use
radar returns from target reflectors
or distant objects with known range
and bearings from radar site to en-
sure that indicated bearings of air-
craft on ppi display are correct.
4
CONTROL-INDICATOR
Perform azimuth, elevation, and
Control-indicator fails
height finder cursor alinement
cursor alinement
checks (para 3-4).
checks.
5
RADAR SET GROUP
Check color of three dehydrator car-
Dessicant shows no traces
tridges installed in waveguide
of blue, or is pink in color.
adapters (para 3-5).
6
RADAR SET GROUP
Inspect air filters In bottom of
Dirty or damaged air
receiver-transmitter and in receiver
filters.
door for dirt or damage.
7
CONTROL-INDICATOR GROUP
Inspect air filters in bottom left
Dirty or damaged air
front of both pulse generators
filters.
(waster and slave) for dirt or damage.
2-9
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