{"id":"F2006B06158","name":"AD/PC-6/8 - Rear Fuselage - Modification","slug":"ad-pc-6-8-rear-fuselage-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46969,"registerId":"commonwealth-F2006B06158-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-6/8 - Rear Fuselage - 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-6/8 Rear Fuselage - Modification 3/66\n\nApplicability: All models with max. take-off weight of 4850 lbs. Document:  Pilatus SB No. 41.\n\nCompliance: Before 1 July 1966.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1966 addressing a specific structural modification. It has not expanded beyond its original purpose of mandating a rear fuselage modification for specific PC-6 aircraft variants."},"complexity_factors":["Extremely short document (approximately 100 words)","No defined terms section","No cross-references to other legislation beyond the enabling regulations (Civil Aviation Regulations 1998, Part 39)","Simple conditional logic: single applicability criterion (max take-off weight) and single compliance deadline","No nested exceptions or conditional sub-clauses","Straightforward command structure: applicability → document reference → compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\n- Requires owners and operators of **Pilatus Porter PC-6 series aircraft** to carry out a specific **modification to the rear fuselage** (the back section of the plane's body).\n\n**Who it affects:**\n- All Pilatus PC-6 models with a **maximum take-off weight of 4,850 pounds** (about 2,200 kg).\n\n**What must be done:**\n- Follow the instructions in **Pilatus Service Bulletin No. 41** (a technical notice from the aircraft manufacturer).\n- Complete the modification **before 1 July 1966**.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety requirements. If you don't comply, you cannot legally fly the aircraft. This particular directive addresses a structural issue with the rear fuselage that could affect flight safety if left unaddressed."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope, as stated, matches its original framing: it mandates a rear‑fuselage modification for all Pilatus Porter PC‑6 models with a 4,850 lb maximum take‑off weight, to be completed in accordance with Pilatus Service Bulletin No. 41 by 1 July 1966. There is no indication in the instrument text that the scope was altered from that original requirement. (See: AD/PC-6/8 title; Applicability; Document; Compliance.)"},"complexity_factors":["Narrow, clearly defined applicability (specific aircraft series and a single MTOW threshold).","Single identified technical action (rear fuselage modification) rather than multiple conditional requirements.","Fixed deadline for compliance (historical date), which simplifies timing decisions but may require urgent scheduling.","Dependence on an external technical document (Pilatus SB No. 41) for substantive technical detail.","Technical execution requires qualified maintenance providers and workshop capacity, adding operational complexity despite regulatory simplicity."],"plain_english_summary":"Owners/operators of Pilatus PC‑6 aircraft with a maximum take‑off weight of 4,850 lbs must complete a rear‑fuselage modification per Pilatus Service Bulletin No. 41 by 1 July 1966. The AD makes the modification mandatory, shifting costs and downtime onto owners/operators who must arrange qualified maintenance and pay for parts and labour. It replaces voluntary maintenance choice with a time‑limited regulatory requirement to ensure continued airworthiness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-8-rear-fuselage-modification","history":"/api/acts/ad-pc-6-8-rear-fuselage-modification/history","analysis":"/api/acts/ad-pc-6-8-rear-fuselage-modification/analysis","conflicts":"/api/acts/ad-pc-6-8-rear-fuselage-modification/conflicts","importantCases":"/api/acts/ad-pc-6-8-rear-fuselage-modification/important-cases","documents":"/api/acts/ad-pc-6-8-rear-fuselage-modification/documents"}}