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Table 8-11.  Threat Array Page 025 Inputs
Table 8-12.  AN/APR(V)l Radar Modes

TM-55-6930-212-10 Pyrometer and Thermocouple Tester Field Type N-3A Manual
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TM 55-6930-212-10 8-97.  The following EW threat types are also shown at the bottom of threat array page 025: ZSU-23-4 SA-4 SA-6 SA-8 FLAPWHEEL 8-98.  The APR-39 indicator displays up to three threats simultaneously.  In the out-the-window visual scene, a maximum of three threats can be shown at any given time, provided that the ownship is close enough to see all three. 8-99.  The relationship between visual threats (out-the-window) and the hostile ground fire switch is that when the switch is  depressed,  muzzle  flash  occurs  at  each  of  the  visual  threats.    In  practice,  the  distances  between  visual  threats  are such that probably only one threat muzzle flash will be seen at any given time. 8-100.  KILL CONDITIONS FOR ANTI-AIRCRAFT ARTILLERY SITES. 8-101.  The following are kill conditions from anti-aircraft artillery (AAA): ZSU-23-4 - A kill from this threat occurs 4 seconds after going into track Flapwheel - A kill occurs 10 seconds after going into track. 8-102.  KILL CONDITIONS FOR SURFACE-TO-AIR MISSILES. 8-103.    A  kill  from  one  of  these  surface-to-air  missile  (SAM)  threats  occurs  as  a  function  of  that  threat's  range  to  the aircraft (at the time each threat time in track is exceeded) and that threat's average velocity.  The track time for each missile is shown in table 8-12.  Average velocities and an example are shown below: Average velocities SA-4 = Mach 1.25 = 413.75 m/sec SA-6 = Mach 1.4 = 463.4 m/sec SA-8 = Mach 1.0 = 331.0 m/sec Example: a.  At a range of 10 km, the SA-4 would kill the A/C in 100000M÷413.75 m/sec = 24 seconds after the track time of 10 seconds is exceeded or 34 seconds after going into track. b.  At the same range, a kill from the SA-6 would occur in 10000M÷463.4 m/sec = 21.58 seconds after the track time is exceeded, or 28.58 seconds after going into track. c.  The SA-8, at the same range, would kill the A/C in 10000M÷331 m/sec = 30.21 seconds after track time is exceeded, or 37.21 seconds after going into track. 8-92







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