4/20/23 

AIM 

28. 

Primary target only 

29. 

Nonmonitored. No Mode C (an asterisk would indicate nonmonitored with Mode C) 

30. 

Beacon target only (secondary radar based on aircraft transponder) 

31. 

Tracked target (primary and beacon target) control position A 

32. 

Aircraft is squawking emergency Code 7700 and is nonmonitored, untracked, Mode C 

33. 

Controller assigned runway 36 right alternates with Mode C readout 

(Note: a three letter identifier could also indicate the arrival is at specific airport) 

34. 

Ident flashes 

35. 

Identing target blossoms 

36. 

Untracked target identing on a selected code 

37. 

Range marks (10 and 15 miles) (can be changed/offset) 

38. 

Aircraft controlled by center 

39. 

Targets in suspend status 

40. 

Coast/suspend list (aircraft holding, temporary loss of beacon/target, etc.) 

41. 

Radio failure (emergency information) 

42. 

Select beacon codes (being monitored) 

43. 

General information (ATIS, runway, approach in use) 

44. 

Altimeter setting 

45. 

Time 

46. 

System data area 

Surveillance Systems 

4

−

5

−

7