{"id":"F2006B06805","name":"AD/SC7/5 - TKS De-Icing Plumbing - Modification","slug":"ad-sc7-5-tks-de-icing-plumbing-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114665,"registerId":"commonwealth-F2006B06805-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SC7/5 - TKS De-Icing Plumbing - 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)  Short SC7 (Skyvan) Series Aeroplanes\n\n \n\nAD/SC7/5 TKS De-Icing Plumbing - Modification 5/71\n\nApplicability: All models of Series 3 fitted with TKS de-icing. Document:  Shorts SB no. 30-50.\n\nCompliance: Within 100 hours time in service after 31 May 1971.\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 historical airworthiness directive from 1971 (as indicated by the '5/71' suffix). It remains a narrow, targeted safety order addressing a specific technical defect in a specific aircraft type. There is no indication of scope creep; it has not expanded beyond its original purpose of mandating a plumbing modification for de-icing systems on Short SC7 aircraft."},"complexity_factors":["Single, specific aircraft type and model series (Short SC7 Series 3)","Single, specific equipment condition (TKS de-icing fitted)","Single compliance action (follow Shorts SB 30-50)","Single, clear deadline (100 hours time in service after 31 May 1971)","No defined terms section","No cross-references to other legislation beyond the enabling regulations","No conditional logic or exceptions","Extremely brief — approximately 50 words of substantive content"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of **Short SC7 Skyvan Series 3 aircraft** (a twin-turboprop utility plane) that are fitted with **TKS de-icing systems** to carry out a specific modification to the de-icing plumbing.\n\n**The specific requirement:** Operators must follow **Shorts Service Bulletin No. 30-50** — a technical instruction from the aircraft manufacturer — and complete the modification within **100 hours of flying time** after **31 May 1971**.\n\n**Who it affects:** Anyone operating a Short SC7 Series 3 Skyvan with TKS de-icing equipment in Australia.\n\n**Why it matters:** Airworthiness Directives are legally binding safety mandates. Failing to comply means the aircraft cannot be considered airworthy and cannot legally fly. This particular directive addresses a specific technical issue with the de-icing plumbing that could affect flight safety in icing conditions."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive applies only to the aircraft class and equipment explicitly named: \"All models of Series 3 fitted with TKS de-icing\" (Applicability). The instrument sets a mandatory modification per Shorts SB no. 30-50 to be completed within the stated time window (Document, Compliance). The text gives no indication that the scope was expanded or narrowed relative to an earlier intent; it simply prescribes the modification for the identified subset of aircraft."},"complexity_factors":["Narrow, clearly defined applicability (only Series 3 aircraft fitted with TKS de-icing) (Applicability).","Single prescriptive action referenced to a single service bulletin (Shorts SB no. 30-50) (Document).","Fixed and short compliance window (100 hours after 31 May 1971) (Compliance).","No alternate compliance methods, exceptions, or phased measures stated in the text (Compliance).","Operational complexity rests with maintenance logistics (parts, labour, scheduling) but is not detailed in the directive (Document, Compliance)."],"plain_english_summary":"This AD mandates a specific TKS de-icing plumbing modification for all Short SC7 (Skyvan) Series 3 aircraft fitted with TKS, to be carried out per Shorts Service Bulletin no. 30-50 within 100 hours TIS after 31 May 1971. Owners/operators must arrange, fund and schedule the work; compliance is mandatory and likely causes downtime and parts/labour costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sc7-5-tks-de-icing-plumbing-modification","history":"/api/acts/ad-sc7-5-tks-de-icing-plumbing-modification/history","analysis":"/api/acts/ad-sc7-5-tks-de-icing-plumbing-modification/analysis","conflicts":"/api/acts/ad-sc7-5-tks-de-icing-plumbing-modification/conflicts","importantCases":"/api/acts/ad-sc7-5-tks-de-icing-plumbing-modification/important-cases","documents":"/api/acts/ad-sc7-5-tks-de-icing-plumbing-modification/documents"}}