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Circuit procedures at, and carriage and use of radio at, or in the vicinity of, non-towered aerodromes (involving amendment to CARs 166 and 166A)

Project status: 

Project Closure Notes

Project closed 9 June 2010.

Amendments to CAR 166 were implemented on 3 June 2010 for circuit procedures at, and carriage and use of radio at, or in the vicinity of, non-towered aerodromes.

CAR 166 has been amended, including consequential amendments to the relevant CAOs supporting the CAR 166 amendments as follows:

  • CAAPs 166-1(0) and 166-2(0) available here
  • AIP amendments effective 3 June 2010
  • VFRG amended and available
  • Training and education material available here.


This project originally replaced and extended consultation project OS 03/01 relating to straight-in approaches. It involved a review of the 1988 CARs to incorporate harmonised requirements and procedures for CTAF coverage in Australia with that of the USA.

Characteristic 29 of Stage 2c of the National Airspace System (NAS) was introduced on 24 November 2005 by amendment to CARs 166 and 166A, and CASA committed to conducting a formal review of the impact of the new procedures.

Following a post-implementation review (PIR) in 2006, this project became responsible for PIR Recommendation 4 which states:

"CASA should make the following radio calls mandatory at all CTAFs, and other calls recommended, as at present:

  • Prior to entering the runway for departure;
  • Prior to 10nm or 8 minutes inbound from the aerodrome;
  • Either entering downwind or turning base; or
  • If conducting a straight-in approach, on final at 5nm.

(This requirement should be reviewed in 2 years.)"

Rules affected

CARs 166 and 166A

Project Priority


Project management

Project Leader: Peter Robbins

Standards Development Project Officers: Peter Robbins and Stuart Jones

Project Stakeholders:

Greg Hood, Executive Manager, CASA Operations

Peter Boyd, Executive Manager, Standards Development and Future Technologies

Mark Sinclair, Executive Manager, Safety Analysis and Education

Project AS 03/03