AIM
4/20/23
4
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5
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4
Surveillance Systems
the entire flight. Assignments are made by the ARTCC computer on the basis of the National Beacon Code
Allocation Plan. The equipment is also designed to receive Mode C altitude information from the aircraft.
NOTE
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Refer to figures with explanatory legends for an illustration of the target symbology depicted on radar scopes in the NAS
Stage A (en route), the ARTS III (terminal) Systems, and other nonautomated (broadband) radar systems. (See FIG 4
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5
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3
and FIG 4
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5
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4.)
d.
It should be emphasized that aircraft transponders greatly improve the effectiveness of radar systems.
REFERENCE
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AIM, Para 4
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1
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20, Transponder and ADS
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B Out Operation.