{"id":"F2006B06138","name":"AD/PC-6/34 - Additional Modifications for Compliance with Requirements for Issue of Certificate of Airworthiness","slug":"ad-pc-6-34-additional-modifications-for-compliance-with-requirements-for-issue-of-certificate-of-air","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46923,"registerId":"commonwealth-F2006B06138-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-6/34 - Additional Modifications for Compliance with Requirements for Issue of Certificate of Airworthiness","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Pilatus Porter PC-6 Series Aeroplanes\n\n \n\nAD/PC-6/34 Additional Modifications for Compliance\n\nwith Requirements for Issue of Certificate of Airworthiness\n\n\n7/72\n\n \n\nApplicability: Model PC6-H2.\n\n \n\nRequirement: 1. Modify each front seat restraint installation by fitting a safety harness in accordance with a scheme approved by the Secretary.\n\n \n\n2.    Install a placard indicating the location of the Flight Manual.\n\n \n\n3.    Calibrate and install a placard adjacent to the fuel quantity gauges.\n\n \n\n4.    Modify the external power connection circuitry to prevent inadvertent connection of reverse polarity or disconnect the external power system from the aircraft electrical system.\n\n \n\nCompliance: Before 31 August 1972.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The instrument is a standalone airworthiness directive that mandated four specific modifications to Pilatus PC-6/H2 aircraft before 31 August 1972; it has not been amended and imposes no current obligations."},"complexity_factors":["historical directive with no ongoing compliance requirement","applies to a single aircraft model (PC-6/H2)","prescriptive one-off modifications with a fixed past deadline"],"plain_english_summary":"This is an old Australian airworthiness directive (AD) issued under Civil Aviation Regulations 1998, Part 39. It applied to one specific variant of the Pilatus Porter: the PC-6/H2. The directive required owners and operators to complete four modifications before 31 August 1972. The modifications were: fit an approved safety harness to each front seat restraint; install a placard showing where the flight manual is stowed; calibrate the fuel quantity gauges and fit a placard next to them; and either modify the external power connection circuitry to guard against reverse polarity or disconnect the external power system from the aircraft's electrical system entirely. The AD was a one-off requirement linked to the initial issue of a certificate of airworthiness for that model. There is no ongoing or repetitive inspection requirement. For anyone researching the compliance history of a Pilatus PC-6/H2, this directive confirms what extra work was mandated before the aircraft could first be certified in Australia. Today the directive is of historical interest only; it does not impose any current obligations on owners, operators or maintenance organisations. If you are checking an aircraft's records, you would expect to see evidence that these four items were addressed by the deadline, which passed more than 50 years ago."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument applies to Model PC6-H2 and lists four specific modifications with a compliance date. The text contains no language indicating a change to the scope from its stated safety-compliance purpose or any expansion beyond those listed requirements."},"complexity_factors":["Multiple discrete technical tasks required (seat restraint, placards, fuel-gauge calibration, electrical modification).","Requirement that the front-seat harness scheme be approved by the Secretary creates administrative/approval interaction.","Electrical modification to prevent reverse polarity involves design, testing and possible re-certification of wiring or isolation arrangements.","Fixed compliance deadline requires fleet scheduling and potential aircraft downtime for owners/operators.","Applicability limited to a single model (PC6-H2) concentrates compliance burden on a defined owner group."],"plain_english_summary":"This airworthiness directive requires owners/operators of Pilatus Porter Model PC6-H2 aeroplanes to carry out four safety-related changes before 31 August 1972: fit approved front-seat safety harnesses, add a Flight Manual location placard, calibrate fuel gauges and fit nearby placards, and change the external power connection so reverse polarity cannot be connected or so external power is isolated. The Secretary must approve the harness scheme. Owners pay for and arrange the work; the directive changes on-aircraft fittings and operational checks."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a vintage 1972 Airworthiness Directive that remains tightly focused on its original purpose: mandating specific physical modifications to a single aircraft model to meet contemporary safety standards. There is no evidence of scope creep; it addresses exactly what it set out to address—basic airworthiness requirements for the PC-6-H2."},"complexity_factors":["Very short document (under 200 words)","Only 4 specific requirements, each described in a single sentence","No defined terms section","No cross-references to other legislation or regulations","Single, absolute compliance deadline (no conditional timelines)","No exceptions or exemptions listed","Simple applicability test (single model number only)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) for a specific type of aircraft: the **Pilatus Porter PC-6-H2**.\n\n**What it does:**\nIt requires owners/operators of these Swiss-made utility aircraft to make four specific safety modifications before flying:\n\n- **Fit proper safety harnesses** to the front seats (replacing or upgrading the existing restraints)\n- **Install a placard** showing where the Flight Manual is kept (so pilots can quickly find critical operating information)\n- **Calibrate the fuel gauges** and add a warning placard next to them (ensuring pilots know exactly how much fuel they have)\n- **Fix the external power connection** so it can't be plugged in backwards, or disconnect the external power system entirely (preventing electrical damage or fire)\n\n**Who it affects:**\nAnyone operating a Pilatus PC-6-H2 aircraft in Australia.\n\n**Why it matters:**\nThese changes address basic safety risks: protecting occupants in crashes (harnesses), preventing pilot error from missing information (placards), avoiding fuel starvation or overfilling (gauge calibration), and preventing electrical fires or equipment damage (power polarity protection). Without these fixes, the aircraft cannot legally be issued or maintain its Certificate of Airworthiness (the official document saying it's safe to fly)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-34-additional-modifications-for-compliance-with-requirements-for-issue-of-certificate-of-air","history":"/api/acts/ad-pc-6-34-additional-modifications-for-compliance-with-requirements-for-issue-of-certificate-of-air/history","analysis":"/api/acts/ad-pc-6-34-additional-modifications-for-compliance-with-requirements-for-issue-of-certificate-of-air/analysis","conflicts":"/api/acts/ad-pc-6-34-additional-modifications-for-compliance-with-requirements-for-issue-of-certificate-of-air/conflicts","importantCases":"/api/acts/ad-pc-6-34-additional-modifications-for-compliance-with-requirements-for-issue-of-certificate-of-air/important-cases","documents":"/api/acts/ad-pc-6-34-additional-modifications-for-compliance-with-requirements-for-issue-of-certificate-of-air/documents"}}