A report analysing responses to CASA's low-level frequency discussion paper (DP) has indicated that most of the submissions to the DP supported using Multicom 126.7 in the vicinity of airstrips not marked on aeronautical charts.
CASA released DP1610AS in February this year to collect feedback on whether or not radio calls at non-controlled, non-CTAF airstrips should be made on Multicom or the Area VHF frequency.
According to the report's compilers, business consultancy Nous Group, submissions favoured the Multicom.
"Over half of all responses and submissions expressed exclusive support for MULTICOM," the report states. "Though there were detailed arguments to retain the current practice of monitoring and broadcasting on Area VHF, including submissions from two Commonwealth Government agencies responsible for aviation safety, there was broad criticism of its perceived limitations from detractors."
Of the 381 responses collected, 315 or 82% expressed support for using the Multicom, whereas only 44% opted for the Area VHF. Several respondents indicated either would be acceptable. Only 11% rejected the Multicom out-right, whereas 35% said the Area VHF was unacceptable.
"Accordingly, Nous’ analysis has found that the majority of respondents favour a return to the pre-2013 situation in which MULTICOM 126.7 MHz was used in the vicinity of an unmarked ALA, except in the vicinity of a discrete Common Traffic Advisory Frequency (CTAF) or Broadcast Area Frequency," the report says.
However, those in favour of the Area VHF include CASA themselves, Airservices Australia, the Australian Maritime Safety Authority and Regional Express.
Most of the support for the Area VHF was based on access to air traffic control, whilst criticism was about congestion and confusion. Supporters of the Multicom cited better coverage, established use and simplicity, but Multicom also drew criticism over congestion.
CASA has said it expects to create a policy on the issue before the end of October 2017.
"We will consider the impacts of any proposed changes on the overall air traffic management system, to ensure that any changes address future needs of all airspace users and are considered as part of an enhanced and improved airspace design," CASA said in releasing the report.
The full Nous Group report and some submissions are on the CASA website.