{"id":"F2006B02079","name":"AD/AC/2 - Augmentor Tubes - Installation of New Type Supports","slug":"ad-ac-2-augmentor-tubes-installation-of-new-type-supports","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41309,"registerId":"commonwealth-F2006B02079-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/2 - Augmentor Tubes - Installation of New Type Supports","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue NK,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Augmentor Tubes - Installation of New Type Supports,2\ntitle: Airworthiness Directive - AD/AC/2 - Augmentor Tubes - Installation of New Type Supports\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)  Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n \n\nAD/AC/2 Augmentor Tubes - Installation NK of New Type Supports\n\nApplicability: Model 560A; S/Nos. 231 to 269. Document:  1. Aero Commander SB. 31; or\n\n2. FAA AD 56-2-1.\n\n \n\nCompliance: Forthwith.\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 instrument as presented sets a specific, narrow scope: it applies only to Model 560A aircraft with serial numbers 231–269 and requires installation of new-type supports per the referenced documents, to be done forthwith. The text contains no indication that the scope has been expanded, reduced or otherwise altered from an earlier or original intent within the document supplied."},"complexity_factors":["Narrow and clear applicability limited to a specific model and serial number range (Model 560A; S/Nos. 231–269).","Single prescriptive action (install new type supports for augmentor tubes) reduces procedural complexity.","Immediate compliance requirement (\"Forthwith\") raises operational scheduling pressure.","AD relies on external technical documents (Aero Commander SB 31 or FAA AD 56-2-1) for implementation details, requiring operators to obtain and interpret those documents.","Minimal regulatory discretion for operators (the AD prescribes what must be done, not optional mitigations).","Potential logistical complexity in sourcing parts and arranging maintenance, depending on supply and MRO capacity."],"plain_english_summary":"What this instrument does (mechanically)\n\n- This is an Australian airworthiness directive that requires a physical modification: the installation of a new type of supports for the augmentor tubes on certain Twin Commander aeroplanes. (See: \"AD/AC/2 Augmentor Tubes - Installation of New Type Supports\")\n- The directive applies only to Model 560A aircraft with serial numbers 231 to 269. (See: \"Applicability: Model 560A; S/Nos. 231 to 269.\")\n- The modification must be carried out in accordance with one of the referenced technical documents: Aero Commander Service Bulletin 31, or FAA AD 56-2-1. (See: \"Document: 1. Aero Commander SB. 31; or 2. FAA AD 56-2-1.\")\n- Compliance is required forthwith, i.e. without delay. (See: \"Compliance: Forthwith.\")\n\nWho is affected\n\n- Owners and operators of Twin Commander Model 560A aircraft with serial numbers in the 231–269 range are directly affected: they must ensure the new supports are installed. (See: Applicability.)\n- Maintenance organisations or mechanics who perform the work will carry out the installation under the instructions of the referenced service/airworthiness documents. (See: Document.)\n- The Civil Aviation Safety Authority (CASA) is the issuing authority under the Civil Aviation Regulations framework. (See header: \"Civil Aviation Regulations 1998, PART 39 ... SCHEDULE OF AIRWORTHINESS DIRECTIVES.\")\n\nWhy it matters (stated purpose and practical consequences)\n\n- The directive is issued as an airworthiness requirement, which means compliance is necessary to meet the regulator’s continuing-airworthiness standard for the listed aircraft. The directive points operators to specific technical instructions to achieve that standard. (See: header; Document; Compliance.)\n\nCosts, incentives and who decides\n\n- Who pays: the aircraft owners/operators pay for parts, labour and any aircraft downtime required to carry out the modification. (Implied by Applicability + Document + Compliance.)\n- Who decides how to comply: the AD prescribes the outcome and the technical references to follow; owners/operators must schedule the work and choose a maintenance provider to carry it out in line with the referenced documents. CASA issues the directive and the referenced service bulletin/FAA AD provide the technical means of compliance. (See: Document; Compliance; header.)\n\nImplementation trade-offs, burdens and risks (mechanisms, not judgements)\n\n- Compliance timing: the requirement is immediate (\"forthwith\"), which creates a near-term scheduling demand on operators and maintenance providers. (See: Compliance.)\n- Dependence on external technical documents: the AD does not include step‑by‑step instructions itself but requires following Aero Commander SB 31 or FAA AD 56-2-1, so operators must obtain and follow those documents to complete the work. That creates a compliance dependency on those documents. (See: Document.)\n- Operational impact: installing the supports will require aircraft access, labour and possibly parts lead time; those activities produce direct costs and take the aircraft out of service for the duration. (Implied by the installation requirement and Compliance.)\n- Effect on service providers and competition: maintenance organisations capable of performing the modification will receive work from affected operators; independent MROs can perform the work provided they follow the referenced instructions. (Implied by Document + who pays/who decides.)\n\nInformation gaps in the instrument\n\n- The AD itself is brief and relies on the referenced service bulletin or FAA AD for technical detail. Operators must consult those documents to know the exact steps, parts and labour standards required. (See: Document.)\n\nSource citations\n\n- Issuing authority and instrument header: \"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES.\" (Header.)\n- Action required and subject: \"AD/AC/2 Augmentor Tubes - Installation NK of New Type Supports.\" (Title/subject line.)\n- Applicability: \"Model 560A; S/Nos. 231 to 269.\" (Applicability.)\n- Technical references: \"1. Aero Commander SB. 31; or 2. FAA AD 56-2-1.\" (Document.)\n- Timing of compliance: \"Compliance: Forthwith.\" (Compliance.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical issue on a narrow subset of aircraft. It has not expanded beyond its original purpose of mandating a specific hardware modification."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 defined applicability criterion (specific model and serial number range)","No nested conditional logic or exceptions","Single compliance requirement with immediate effect","References only 2 external technical documents (Service Bulletin and FAA AD)","No interpretation section or defined terms","Straightforward command structure: applicability + requirement + compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by the Civil Aviation Safety Authority (CASA) — Australia's aviation safety regulator. It mandates a specific safety fix for certain **Twin Commander aircraft** (models 560A with serial numbers 231 to 269).\n\n**What it requires:**\nOwners and operators must **install new type supports for the augmentor tubes** on these aircraft. Augmentor tubes are components of the aircraft's exhaust/thrust augmentation system. The directive references two technical documents that provide the proper procedure: an Aero Commander Service Bulletin (SB. 31) or an older FAA Airworthiness Directive (56-2-1).\n\n**Who must comply:**\nAnyone operating the specific aircraft models listed (Twin Commander 560A, serials 231–269).\n\n**When:**\n**\"Forthwith\"** — meaning immediately, without delay.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. They are issued when a safety defect or unsafe condition is discovered in an aircraft type. Non-compliance means the aircraft cannot legally fly in Australian airspace. This particular AD addresses a structural or safety issue with how the augmentor tubes are supported, likely to prevent failure in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-2-augmentor-tubes-installation-of-new-type-supports","history":"/api/acts/ad-ac-2-augmentor-tubes-installation-of-new-type-supports/history","analysis":"/api/acts/ad-ac-2-augmentor-tubes-installation-of-new-type-supports/analysis","conflicts":"/api/acts/ad-ac-2-augmentor-tubes-installation-of-new-type-supports/conflicts","importantCases":"/api/acts/ad-ac-2-augmentor-tubes-installation-of-new-type-supports/important-cases","documents":"/api/acts/ad-ac-2-augmentor-tubes-installation-of-new-type-supports/documents"}}