{"id":"F2006B07491","name":"AD/TSA-600/26 - Nacelle Fairing - Modification","slug":"ad-tsa-600-26-nacelle-fairing-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49944,"registerId":"commonwealth-F2006B07491-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TSA-600/26 - Nacelle Fairing - 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)  Aerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes\n\n \n\nAD/TSA-600/26 Nacelle Fairing - Modification 8/80\n\nApplicability: Models 600, 601 and 601P with S/Nos. 0001 to 0799. Document:  1. Piper SB No. SB600-83; or\n\n2. FAA AD 80-12-14, Amendment 39-3801.\n\n \n\nCompliance: Before 1 March 1981.\n\n \n\nBackground: The lower engine nacelle aft fibreglass fairing is inadequate to prevent flames from a possible engine fire entering the lower wing structure.\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":2,"scope_assessment":{"changed":false,"description":"The directive, as presented, states a specific, limited change: mandatory modification of the lower engine nacelle aft fibreglass fairing on Models 600/601/601P with S/N 0001–0799, to be done per the referenced service bulletin or FAA AD before 1 March 1981. The text does not indicate any widening or narrowing of that scope from an earlier stated intent within this document."},"complexity_factors":["Narrow applicability (specific models and serial number range) reduces scope complexity (Applicability).","Single, fixed compliance date simplifies scheduling but concentrates workload (Compliance).","Technical work is required (modification of nacelle fairing); the AD delegates technical detail to external documents (Piper SB600-83 or FAA AD 80-12-14), which adds a layer of document-dependence (Document).","Enforcement, penalty, and recordkeeping details are not set out in the text provided, leaving implementation detail to the broader regulatory framework.","Potential need for certified maintenance facilities or parts supply introduces practical execution complexity not specified in the AD (Document)."],"plain_english_summary":"Owners and operators of Aerostar (Piper/Ted Smith) Models 600, 601 and 601P (S/N 0001–0799) must, by 1 March 1981, modify the lower engine nacelle aft fibreglass fairing in accordance with Piper SB600‑83 or FAA AD 80‑12‑14.\n\nThe amendment is intended to prevent engine‑fire flames entering the lower wing; affected operators pay for and arrange the work, may ground aircraft until done, and must follow the referenced service/airworthiness documents for technical and certification details."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a limited aircraft population. It has not expanded beyond its original purpose of mandating a fire-prevention modification."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 defined applicability criteria (specific models and serial number range)","Single compliance requirement with two alternative reference documents","No nested conditional logic or exceptions","No cross-references to other legislation beyond the two technical documents","Straightforward cause-and-effect: identified hazard → mandated fix → deadline"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific **Aerostar (Piper/Ted Smith) 600 and 700 series aircraft** to modify the engine nacelle fairing (the protective covering around the engine) to prevent fire hazards.\n\n**What it does:**\n- **Mandates a safety modification** to the lower engine nacelle aft fibreglass fairing on affected aircraft\n- **Addresses a fire risk**: The original fairing design is inadequate and could allow flames from an engine fire to enter the lower wing structure — a serious safety hazard\n\n**Who it affects:**\n- Owners and operators of **Aerostar Models 600, 601, and 601P** with **serial numbers 0001 to 0799**\n\n**What must be done:**\n- Aircraft must be modified according to either:\n  - **Piper Service Bulletin SB600-83**, or\n  - **FAA Airworthiness Directive 80-12-14** (the US equivalent safety order)\n- **Deadline**: Before 1 March 1981\n\n**Why it matters:**\nThis directive prevents a potentially catastrophic scenario where an engine fire could spread to the wing structure, compromising the aircraft's structural integrity and endangering passengers and crew. Compliance is mandatory — flying without this modification would violate civil aviation safety regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tsa-600-26-nacelle-fairing-modification","history":"/api/acts/ad-tsa-600-26-nacelle-fairing-modification/history","analysis":"/api/acts/ad-tsa-600-26-nacelle-fairing-modification/analysis","conflicts":"/api/acts/ad-tsa-600-26-nacelle-fairing-modification/conflicts","importantCases":"/api/acts/ad-tsa-600-26-nacelle-fairing-modification/important-cases","documents":"/api/acts/ad-tsa-600-26-nacelle-fairing-modification/documents"}}