ENR 1.6 RADAR SERVICE AND PROCEDURES
1  GENERAL
1.1  Services Provided
1.1.1 Radar services for area control, approach control and flight information are provided by means of primary surveillance radar (PSR), and secondary surveillance radar (SSR).
1.1.2 Beyond the range of PSR, radar services are provided by SSR only. Pilots should note that a radar flight information service cannot provide collision avoidance information on aircraft that:
(a)  
do not have an operating transponder; and

(b)  
inadvertently penetrate transponder mandatory airspace beyond the range of the associated PSR.

1.1.3 In the event of failure of an associated PSR, the advice provided in 1.1.2 will also apply in the following airspace:
(a)  
Auckland, Wellington, and Christchurch CTA/C and CTR/C;

(b)  
Woodbourne CTA/D; and

(c)  
Whenuapai and Woodbourne CTR/D.

1.1.4  Limitations of service will be advised by NOTAM.

PRIMARY SURVEILLANCE RADAR (PSR)

2.1 PSR Sites
2.1.1 PSRs, with a maximum range of up to 80NM, are located at:
(a)
Auckland Airport;

(b)
Christchurch Airport; and

(c)
Hawkins Hill (3.5NM west of Wellington Airport).

D

3 SECONDARY SURVEILLANCE RADAR (SSR)

3.1 SSR Sites
3.1.1 SSRs, with a maximum range of 256NM, are located at the following
sites: 
(a)  Ruaotuwhenua  12.5NM north-west of Auckland Airport; 
(b)  Te Weraiti  Kaimai Range 6.5NM east of Matamata Township; 
(c)  Ballance  Tararua Range between Palmerston North 
aerodrome and Pahiatua Township; 
(d)  Hawkins Hill  3.5NM west of Wellington Airport; 
(e)  Mt Robertson  3NM south-east of Picton Township; 
(f)  Cass Peak  Port Hills 9.5NM south-east of Christchurch 

Airport.
3.1.2 The SSR sites are all elevated to improve low level cover. They are shown on the appropriate topographical charts.

3.2 Transponders
3.2.1 Transponders allow positive aircraft identification and altitude information to be displayed on air traffic control radars. This enables controllers to quickly determine where potential conflicts could occur.
3.2.2 In addition, operation of transponders at all times increases safety when operating in the vicinity of ACAS equipped aircraft, and will enhance Search and Rescue and emergency action when operating within radar cover.
3.2.3 Adherence to transponder operating procedures provides both VFR and IFR aircraft with a higher degree of safety and reduces communications, giving a more efficient service.
3.2.4 ATC must verify with the pilot at least once during the flight that the altitude information received from the transponder is correct, prior to using that information for separation purposes.

3.3  System of SSR Code Assignment
SSR Code Allocation
3.3.1 SSR codes are allocated by radar equipped ATS facilities to controlled flights operating within their area of responsibility, and to controlled flights entering the New Zealand FIR from the Auckland Oceanic FIR.
3.3.2 Codes for use in New Zealand are allocated in accordance with international agreements and instructions contained in the Manual of Air Traffic Services.
3.3.3 The pilot operating an aircraft, not in a formation, in transponder-mandatory airspace must set the transponder:
(a)  
to the appropriate code assigned by ATC for the flight; or

(b)  
if not assigned a code by ATC, in accordance with Table ENR 1.6-1;or

(c)  
if an in-flight emergency, loss of communications, or an unlawful interference occurs, in accordance with Table ENR 1.6-2.

Table ENR 1.6-1
　
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