{"id":"F2006B06127","name":"AD/PC-6/24 Amdt 1 - Aileron Balance Weight Bolts - Modification","slug":"ad-pc-6-24-amdt-1-aileron-balance-weight-bolts-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46900,"registerId":"commonwealth-F2006B06127-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-6/24 Amdt 1 - Aileron Balance Weight Bolts - Modification","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-6/24\n\nAmdt 1\n\n\nAileron Balance Weight Bolts - Modification 9/68\n\n \n\nApplicability: All models. Document: Pilatus SB No. 81.\n\nCompliance: Before 5 September 1968.\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\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied instrument shows applicability to all Pilatus Porter PC-6 models and sets a single compliance action and deadline. The text does not indicate any change from an earlier or original scope; there is no statement in the supplied text that the scope has been expanded or narrowed. (See: \"Applicability: All models.\"; \"Compliance: Before 5 September 1968.\")"},"complexity_factors":["Narrow technical focus: single modification to aileron balance weight bolts reduces legal complexity (title and subject matter).","Short, absolute deadline increases operational urgency and scheduling complexity (\"Compliance: Before 5 September 1968\").","Requires consultation of an external technical document — Pilatus SB No. 81 — for procedural details, adding an implementation dependency (\"Document: Pilatus SB No. 81\").","Applicability to all models simplifies scope but may increase logistical complexity for operators with multiple airframes (\"Applicability: All models\").","Lack of procedural, cost or recordkeeping detail in the supplied text increases uncertainty for implementers and may require regulator or manufacturer clarification (absence of such detail in the supplied text)."],"plain_english_summary":"This AD mandates a modification to the aileron balance weight bolts on Pilatus Porter PC‑6 series aeroplanes, referencing Pilatus Service Bulletin No. 81 for the required work. It is compulsory for all PC‑6 operators/owners under the Commonwealth (CASA) Part 39 airworthiness framework and must be completed before 5 September 1968."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1968. It has not expanded beyond its original narrow scope of requiring a specific bolt modification on one aircraft type. The amendment (Amdt 1) appears to be a formal revision marker rather than a substantive expansion of scope."},"complexity_factors":["Extremely short document — only 8 substantive lines","No defined terms section","No cross-references to other legislation (only references Pilatus Service Bulletin No. 81, which is an external manufacturer document)","No conditional logic or exceptions","Simple structure: applicability, document reference, compliance deadline","Single, unambiguous requirement with fixed deadline"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for **Pilatus Porter PC-6 series aeroplanes**.\n\n**What it does:**\n- Requires owners/operators to modify the **aileron balance weight bolts** on these aircraft\n- The modification is identified as \"Modification 9/68\" and is detailed in **Pilatus Service Bulletin No. 81**\n\n**Who it affects:**\n- Anyone who owns or operates any model of Pilatus Porter PC-6 aircraft in Australia\n\n**Why it matters:**\n- Aileron balance weights are critical components that help stabilize the aircraft's control surfaces during flight. If the bolts securing these weights fail, it could lead to loss of control\n- This directive was issued to prevent potential accidents due to bolt failure\n- **Compliance was required before 5 September 1968** — meaning this is a historical directive that should have been completed decades ago for any aircraft still in service\n\n**Key point:** This is not current law being introduced now. It is a historical aviation safety directive from 1968 that remains on the books as part of Australia's airworthiness regulations. Any PC-6 aircraft operating today should have had this modification completed long ago."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-24-amdt-1-aileron-balance-weight-bolts-modification","history":"/api/acts/ad-pc-6-24-amdt-1-aileron-balance-weight-bolts-modification/history","analysis":"/api/acts/ad-pc-6-24-amdt-1-aileron-balance-weight-bolts-modification/analysis","conflicts":"/api/acts/ad-pc-6-24-amdt-1-aileron-balance-weight-bolts-modification/conflicts","importantCases":"/api/acts/ad-pc-6-24-amdt-1-aileron-balance-weight-bolts-modification/important-cases","documents":"/api/acts/ad-pc-6-24-amdt-1-aileron-balance-weight-bolts-modification/documents"}}