Response today from CASA....
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Enquiry number **********
Question: I am planning on constructing a 500m private airstrip on my mining lease in Cue, Western Australia. I just wanted to reach out to CASA to be sure I'm not contravening and regulations in doing so.
Answer: Aircraft landing areas (ALA) and are not oversighted or approved by CASA. Airstrips can be constructed at the landowner's discretion, though a pilot must only use a place to land or take off if they determine it is appropriate for that purpose. Likewise, the landowner may choose a surface that is appropriate for the intended types of operation/aircraft.
CASA has produced some guidance on the use of ALAs. This guidance is aimed primarily at pilots to assist with the assessment of a location for landing or taking off, however may be useful as general information for the operator of an ALA. Please see advisory circular AC 91-02 v1.1 Guidelines for aeroplanes with MTOW not exceeding 5 700 kg - suitable places to take off and land.
There are no specific regulatory requirements relating to the operation of an ALA. The responsibility for safe operations at an ALA lies with the pilot in command and operator under the conditions of subregulation 91.410 (2) (a) (iv) of the Civil Aviation Safety Regulations 1998 (CASR).
For an ALA, Chapter 6 of the Part 139 (Aerodromes) Manual of Standards 2019 may be used as guidance.
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Regards,
CASA\Regulatory Guidance