C1001 "Fam 0"
(see the master curriculum guide for direction - a lot of things to know, but you should know them by now)
KNOW your T-34C NATOPS specifications Limits, ranges, etc and your Preflight procedure.
The system uses the transponder replies of other aircraft to compute the responding
aircraft’s range, bearing, altitude, and closure rate. The aircraft must have
a transponder to be seen.
NACWS can track up to 50 transponder-equipped aircraft out to a maximum distance of 20nm.
The system can operate in either a passive or active mode. The passive mode is the primary mode of operation. Here it monitors radars as well as other aircraft transponders out to 20nm. In the active mode, no ground-based radar interrogations, NACWS transmits and receives it’s own interrogations out to 6nm.
There are two modes from within the system known as “enroute” and “landing”. The enroute mode’s proximity zone extends out 20nm from your aircraft and +/- 2700 ft. The protection zone within the proximity zone extends 1nm and +/- 500 ft. If NACWS detects an aircraft within 20 seconds of penetrating this protection zone, it’ll sound an alarm of 6 tones in 2 seconds in your headset. On the other hand, in the landing mode, the proximity zone extends 1.5nm and +/- 500 ft. The protection zone here is 0.1nm and +/- 500 ft. If NACWS detects an aircraft within 10 seconds of the protection zone, it’ll sounds an alarm of 12 tones in 2 seconds in you headset.
There are three screens that appear in NACWS under normal operating conditions. The “DME” screen is the primary screen. It is shown when there are no traffic advisories (TA) and provides the following information: current heading, DME distance, date/time, range selected (20, 10, 5, 3, 1.5 nm), the current operating mode (enroute/landing), and lat/long as obtained from GPS.
Since NACWS operates both in active and passive simultaneously, the only time you’ll see the “active” screen is when the passive capability becomes inoperable. Essentially what you’ll see is a prioritized listing of up to eight TA’s with the highest listed first. By pressing the RNG button you can toggle between enroute and landing mode. Keep in mind, the active screen does not offer any relative bearing information!
The last screen is the “proximity” screen. This screen provides the most data. By pressing the PROX button it’ll display for 45 seconds. If a TA exists the symbol will flash. Study the symbols in your NATOPS so you know what you are looking at (page 19-7)
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