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T-34C AIRCRAFT SYSTEMS FAMILIARIZATION
CHAPTER ELEVEN
WORKBOOK
Naval Aircraft Collision Warning System
NACWS monitors a volume of airspace around your aircraft to alert the aircrew to the presence of
potential traffic conflicts. The system uses the transponder replies of other aircraft to compute the
responding aircraft's range, bearing, altitude, and closure rate. NACWS can track up to 50
transponder-equipped aircraft out to a maximum distance of 20 NM, and display the closest 20.
The system can operate in either passive or active mode.
WARNING
NACWS provides no warning against aircraft that do not have an
operating transponder, therefore, vigilant see-and-avoid procedures
are still required.
NACWS issues an initial traffic advisory (TA) (6 tones in 2 seconds) when an aircraft is within 20
seconds of penetrating the protection zone. An urgent TA (12 tones in 2 seconds) is issued when
it is within 10 seconds.
Figure 11-8 Protection Zone
In addition to warning of threat aircraft, the system allows you to display nearby, nonthreat
aircraft within a selected proximity zone (20, 10, 5, 3, and 1 NM).
AVIONICS
11-13


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