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OPERATIONOFTRANSPONDERS (AIPENR1.6)
Note: Background informationonTranspondersandTCAS is includedonpage85.
Except as indicated below, ATSwill assign a temporary discrete code for each
flight for aircraft operating in controlled airspace, and for aircraft participating
inRadar/ADS-B InformationService (RIS).
Unless otherwise advised byATC, pilots ofMode3A transponder-equipped
aircraft operating inAustralian airspacemust activate their transponders,
andwhere aMode 3C capability is also available itmust be activated
simultaneouslywithMode 3A.
Pilotsmust ensure that transpondersareactivatedand that altitude
function isselectedas:
• Primary radar coverageonly existswithin 50nm ofmajor airports and the
remainder of theATS surveillance system relies onSSR transponder and
ADS-B transmitter information; and
• Relies on transponder information for its pilot alerting and collision
avoidance functions.
OPERATINGREQUIREMENTSFORADS-BTRANSMITTERS
Pilots of aircraft fittedwith a serviceableADS-B transmitterwhich has been
confirmed suitable to receiveADS-BderivedATS surveillance services in
Australia should activate the transmitter at all times duringflight.
Note 1: SomeADS-B installationsmay share controlswith theSSR
transponder,meaning that independent operation of the two systems
is not possible.
Note 2: If it is not possible to complywith a particular instruction thepilot
must adviseATC and request alternative instructions.
Aircraft equippedwithADS-B having an aircraft identification feature shall
transmit the aircraft identification as specified in theflight notification or,
whenno flight notification has been filed, the aircraft registration.
Whenoperating inAustralianairspace, transponder-equippedaircraftmust
select andusecodes inaccordancewith the followingcriteria:
ATS surveillance services
3 – general i nformat i on