TM 11-5840-281-12-1
4-27.
PRELIMINARY SERVICING AND ADJUSTMENT.
This paragraph gives procedures for orienting radar set group to runway, checking Installation, checking equipment
interlocks, turning on radar set, and checking 10- to 35-degree actuator. Perform procedures below In order listed.
WARNING
This equipment develops lethal voltages; observe safety precautions at all times. Injury or death could
result from improper or careless operation.
When power is applied to control indicator and all circuit breakers on receiver-transmitter are off, - 28 v
Is still present in local control monitor.
ORIENTATING RADAR SET GROUP
Radar set group must be oriented with runway to which gca landing service is being provided in order for radar display
data to be valid. Radar set group orientation consists of physically rotating radar set group on pedestal in order to aline
antenna scan sectors to runway, thereby ensuring accurate azimuth and elevation data for runway being serviced. Radar
set group must be initially oriented, as described in steps 1 through 17, to each runway for which gca landing service is
being supplied. Thereafter, to change to a second runway (an approach other than one being serviced) it is only
necessary to perform steps 1 through 3. Steps 1 through 3 orient radar set group so 30 sector scan of azimuth antenna
is centered on rpl (15 degrees on either side of rpl). Steps 4 through 17 check that orientation of radar set will provide
adequate radar coverage, and give instructions for relocating radar set group and/or td point and target simulators, when
adequate radar coverage is not present. Although radar set group should be oriented to all approaches being given gca
service, only two runways at a time can be serviced without realining one of two preset cursors.
ORIENTATION PROCEDURE
NOTE
Perform steps 1 through 17 for each approach being serviced from radar site. Once steps 1 through 17
have been accomplished for all runway approaches, it is only necessary to perform steps 1 through 3
when changing runway approaches to orient radar set group to newly selected runway.
1.
Mount siting scope on antenna drive siting scope mount (Siting Scope Installation, para 4-20).
2.
Loosen, but do not remove, six screws in three strap clamps that secure receiver-transmitter to antenna pedestal.
3.
Rotate receiver-transmitter until vertical crosshair of siting scope is lined up with center of rpl target reflector.
Tighten six screws loosened in step 2.
4.
Remove siting scope from antenna drive siting scope mount and install it on azimuth antenna siting scope mount
(Siting Scope Installation, para 4-20).
5.
Manually rotate azimuth antenna toward runway until 14-degree mark is indicated on azimuth scan protractor.
4-68
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