Naval Aircraft Collision Warning System

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

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