{"id":"F2013L00859","name":"CASA 97/13 - Designation - of airspace - Direction - broadcast requirements and frequency","slug":"casa-97-13-designation-of-airspace-direction-broadcast-requirements-and-frequency","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":90550,"registerId":"commonwealth-F2013L00859-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"CASA 97/13 - Designation - of airspace - Direction - broadcast requirements and frequency","content":"Instrument number CASA 97/13\n\nI, peter beilby cromarty, Executive Manager, Airspace and Aerodrome Regulation Division, a delegate of CASA, make this instrument under regulation 99A of the Civil Aviation Regulations 1988 (CAR 1988).\n\n\\[Signed P. B. Cromarty\\]\n\nPeter Cromarty  \nExecutive Manager  \nAirspace and Aerodrome Regulation Division\n\n28 May 2013\n\nDesignation — of airspace\n\nDirection — broadcast requirements and frequency\n\n1 Commencement\n\nThis instrument commences on 30 May 2013.\n\n2 Designation of airspace\n\nThe airspace mentioned in Schedule 1 is designated as an area in which broadcast requirements apply (designated airspace).\n\n3 Direction — broadcast requirements\n\nThe broadcast requirements mentioned in Schedule 2 apply in the designated airspace.\n\n4 Direction — broadcast area frequency\n\nBroadcasts in the designated airspace must be made on the radio frequency (broadcast area frequency) mentioned in Schedule 3 for the area.\n\nSchedule 1 Designated airspace\n\nThe airspace within:\n\n(a) horizontal limits of the circumference of the circle with a radius of the 20.0 nautical miles centred on 20 22 40S 118 37 35E (YPPD/Port Hedland aerodrome); and\n\n(b) vertical limits from the surface to 8 000 feet above mean sea level.\n\nSchedule 2 Broadcast requirements\n\n1 Aircraft flying within the designated airspace\n\nThe pilot in command of an aircraft, who is flying within the designated airspace, must make a broadcast that includes the following information when entering the designated airspace and whenever it is reasonably necessary to do so to avoid a collision, or the risk of a collision, with another aircraft:\n\n(a) the name of the aerodrome (Port Hedland aerodrome);\n\n(b) the aircraft’s type and call sign;\n\n(c) the position of the aircraft and the pilot’s intentions.\n\n2 Aircraft taking off from, or landing at, an aerodrome within the designated airspace\n\nThe pilot in command of an aircraft, who is taking off from, or landing at, an aerodrome within the designated airspace must make the broadcasts that the pilot of an aircraft must make when operating on the manoeuvring area of, or in the vicinity of, Port Hedland aerodrome, and in accordance with Aeronautical Information Publication.\n\n> Note Regulation 166 of CAR 1988 defines when an aircraft is in the vicinity of a non‑controlled aerodrome. Regulation 166C of CAR 1988 sets out the requirements for the broadcasts that a pilot must make in the vicinity of a non-controlled aerodrome. Regulation 166E of CAR 1988 sets out the requirements for the carriage of a serviceable aircraft VHF radio and for the pilot to hold a radiotelephone qualification when operating in the vicinity of a non-controlled aerodrome that is a certified aerodrome.\n\nSchedule 3 Broadcast area frequency\n\nThe broadcast area frequency is 119.9 MHz.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This instrument itself designates a specified area (Schedule 1) and prescribes broadcast rules (Schedule 2) and a frequency (Schedule 3). The text contains no statement that it amends or replaces an earlier designation; it operates under CAR 1988 reg 99A (instrument header) and confines requirements to the named airspace and altitude limits (Schedules 1–3). Compliance and related obligations are linked to external AIP and CAR provisions (Schedule 2 note)."},"complexity_factors":["Precise spatial and vertical limits: designation specifies a 20.0 NM radius centred on coordinates 20°22'40\"S 118°37'35\"E and vertical limits surface–8,000 ft (Schedule 1) — requires pilots/operators to identify applicability by position.","Mandatory broadcast content and timing: pilots must broadcast on entering and as necessary to avoid collision, listing aerodrome name, aircraft type & call sign, position and intentions (Schedule 2(1)) — creates specific communication obligations.","Additional departure/arrival rules and external reference: takeoff/landing broadcasts must follow AIP and CAR requirements for non‑controlled aerodromes (Schedule 2(2) and accompanying note referencing Regs 166/166C) — compliance requires consulting external documents.","Specified single frequency: broadcasts must use 119.9 MHz (Schedule 3) — operational effect on radio use and frequency planning.","Qualification and equipment implication: note refers to Reg 166E for requirement to carry a serviceable VHF radio and hold a radiotelephone qualification at certified aerodromes (Schedule 2 note) — potential equipment/qualification costs for operators.","Instrument provenance and legal basis: made by a CASA delegate under CAR 1988 reg 99A (instrument header) — administrative discretion in designation process and reliance on underlying regulation for enforcement and effect.","Limited procedural detail in instrument: enforcement mechanisms, sanctions, or surveillance methods are not set out in this instrument and are governed by CAR 1988 and related material (instrument structure and cross‑references) — requires cross‑referencing for full compliance picture."],"plain_english_summary":"This instrument designates the airspace within a 20.0 nautical mile radius of Port Hedland aerodrome up to 8,000 ft and requires pilots to make radio broadcasts on 119.9 MHz when entering or operating there. Required broadcast content includes aerodrome name, aircraft type and call sign, position and intentions; arrivals and departures must also follow the Aeronautical Information Publication and relevant Civil Aviation Regulations. It affects pilots and operators using Port Hedland airspace by imposing communications and qualification/compliance obligations."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument remains tightly focused on its original purpose: establishing broadcast requirements for a specific designated airspace around Port Hedland. It has not expanded beyond this narrow operational safety purpose."},"complexity_factors":["Very short instrument (approximately 500 words)","Only 4 operative sections plus 3 schedules","Minimal defined terms (only 'designated airspace' and 'broadcast area frequency' are effectively defined)","No cross-references to other legislation beyond a single reference to CAR 1988 regulation 99A (the enabling power) and helpful notes pointing to related regulations 166, 166C and 166E","Straightforward conditional logic: if you're in the area, you must broadcast; simple geographic coordinates for the boundary","Single exception/condition: broadcasts required 'when entering' and 'whenever reasonably necessary to avoid collision'"],"plain_english_summary":"This CASA instrument establishes a common traffic advisory frequency (CTAF) around Port Hedland Airport, requiring pilots operating within 20 NM and up to 8,000 ft to make radio broadcasts on 119.9 MHz. It affects arriving, departing and transiting aircraft so pilots can directly announce position and intentions.\n\nIt matters because Port Hedland is busy with limited air traffic control, so the CTAF reduces collision risk in non‑controlled airspace."}},"importantCases":[],"_links":{"self":"/api/acts/casa-97-13-designation-of-airspace-direction-broadcast-requirements-and-frequency","history":"/api/acts/casa-97-13-designation-of-airspace-direction-broadcast-requirements-and-frequency/history","analysis":"/api/acts/casa-97-13-designation-of-airspace-direction-broadcast-requirements-and-frequency/analysis","conflicts":"/api/acts/casa-97-13-designation-of-airspace-direction-broadcast-requirements-and-frequency/conflicts","importantCases":"/api/acts/casa-97-13-designation-of-airspace-direction-broadcast-requirements-and-frequency/important-cases","documents":"/api/acts/casa-97-13-designation-of-airspace-direction-broadcast-requirements-and-frequency/documents"}}