{"id":"F2006B10556","name":"AD/HS 748/21 - Corrosion Prevention and Control Program","slug":"ad-hs-748-21-corrosion-prevention-and-control-program","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116375,"registerId":"commonwealth-F2006B10556-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 748/21 - Corrosion Prevention and Control Program","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)  British Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes\n\n \n\nAD/HS 748/21 Corrosion Prevention and Control Program 10/96\n\nApplicability: British Aerospace HS 748 aircraft.\n\n \n\nRequirement: Action in accordance with Jetstream Aircraft Corrosion Prevention and Control Programme document Reference JS/CPCP/02 dated 1 April 1996.\n\n \n\nNote: UK CAA AD 002-04-96 refers.\n\n \n\nCompliance: At the thresholds specified in the Requirement Document.\n\n \n\nBackground: The Country of Origin Airworthiness Authority requires implementation of a corrosion prevention and control program to prevent the degradation of the structural capabilities of the affected aircraft.\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text provides no indication that the AD changes scope from its original intent. It mandates implementation of the Jetstream JS/CPCP/02 corrosion prevention program for HS 748 aircraft and requires compliance at the thresholds set in that document (Applicability; Requirement; Compliance). No amendment, expansion, or narrowing of scope is described in the provided text."},"complexity_factors":["External document dependence: the AD requires action “in accordance with” JS/CPCP/02, so substantive requirements are located outside the AD (Requirement).","Unspecified thresholds in the AD itself: compliance must be done “at the thresholds specified in the Requirement Document,” creating the need to consult the referenced document for timing and triggers (Compliance).","Limited scope and clear applicability: applies only to British Aerospace HS 748 aeroplanes, narrowing affected population (Applicability).","Cross-reference to another authority: the AD notes a related UK CAA directive, which may require reconciling multiple sources (Note).","Operational burden sits with operators: cost, scheduling, and recordkeeping responsibilities fall on aircraft owners/operators rather than the regulator (Applicability; Requirement)."],"plain_english_summary":"This Airworthiness Directive requires operators of British Aerospace HS 748 aircraft to implement the Jetstream Corrosion Prevention and Control Programme (JS/CPCP/02, 1 Apr 1996) — following its inspection intervals, tasks and thresholds — to prevent structural degradation. It applies only to HS 748 owners/operators, who bear the costs and administrative burden of obtaining and following the external document; the AD also cross‑references a related UK CAA directive."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose airworthiness directive focused specifically on corrosion prevention for one aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","No defined terms section — relies on external reference document (JS/CPCP/02)","Single, clear requirement: comply with external standard","No nested conditions or exceptions","Simple structure: Applicability → Requirement → Note → Compliance → Background","Cross-reference to only one external document (UK CAA AD 002-04-96) and one internal reference document"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners and operators of **British Aerospace HS 748 aircraft** to follow a specific **Corrosion Prevention and Control Program**.\n- This program is detailed in a document called \"Jetstream Aircraft Corrosion Prevention and Control Programme\" (reference JS/CPCP/02, dated 1 April 1996).\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains British Aerospace HS 748 series aeroplanes in Australia.\n\n**Why it matters:**\n- **Corrosion** (rust and chemical degradation of metal) can weaken an aircraft's structure over time, potentially leading to catastrophic failure.\n- The UK aviation authority (the \"Country of Origin\" authority) identified this risk and mandated this program. Australia is adopting the same requirement to keep these aircraft safe.\n- **Compliance is mandatory** — operators must follow the timelines specified in the referenced document.\n\n**Key point:** This isn't a law passed by Parliament in the traditional sense. It's a regulatory safety instrument issued under the **Civil Aviation Regulations 1998**, using powers delegated to CASA to enforce aircraft airworthiness standards."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-748-21-corrosion-prevention-and-control-program","history":"/api/acts/ad-hs-748-21-corrosion-prevention-and-control-program/history","analysis":"/api/acts/ad-hs-748-21-corrosion-prevention-and-control-program/analysis","conflicts":"/api/acts/ad-hs-748-21-corrosion-prevention-and-control-program/conflicts","importantCases":"/api/acts/ad-hs-748-21-corrosion-prevention-and-control-program/important-cases","documents":"/api/acts/ad-hs-748-21-corrosion-prevention-and-control-program/documents"}}