{"id":"F2006B08704","name":"AD/DART/19 - Combustion Air Casing Anti-Tear Straps","slug":"ad-dart-19-combustion-air-casing-anti-tear-straps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51889,"registerId":"commonwealth-F2006B08704-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DART/19 - Combustion Air Casing Anti-Tear Straps","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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Rolls Royce Turbine Engines - Dart Series\n\n \n\nAD/DART/19 Combustion Air Casing Anti-Tear Straps 11/87\n\nApplicability: All Dart RDa-6, RDa-7 series engines.\n\n \n\nRequirement: 1. Action in accordance with Rolls Royce SB Da 72-475 Rev 1; or\n\n \n\n2. AD/RRT/32 Amdt 1.\n\n \n\nCompliance:  As detailed in the Requirement Document. Background: Reissue of AD/RRT/32 Amdt 1.\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":4,"scope_assessment":{"changed":false,"description":"The instrument states it is a reissue of AD/RRT/32 Amdt 1 (\"Background: Reissue of AD/RRT/32 Amdt 1\"). The applicability and the requirements set out in this text mirror the prior directive by reference rather than expanding or narrowing the population or actions in this instrument itself. No additional scope-expanding language appears in the provided text."},"complexity_factors":["References external technical documents for required work (Rolls Royce SB Da 72-475 Rev 1 and AD/RRT/32 Amdt 1) rather than containing procedural detail within the instrument itself (see: \"Requirement\" and \"Compliance\").","Applicability is narrow and specific (only RDa-6 and RDa-7 series engines), which simplifies population identification but requires engine-level checking by operators (see: \"Applicability\").","Compliance details (timing, steps, intervals) are not stated in the AD text and must be read from the referenced Requirement Document, adding an extra step for implementers (see: \"Compliance\").","Provides two alternative compliance pathways, which creates a choice that can complicate operator decision-making if the referenced documents differ in method or timing (see: \"Requirement\").","Administrative context noted as a reissue of a previous AD, which may require cross-referencing historical documents to confirm changes or continuity (see: \"Background\")."],"plain_english_summary":"This Airworthiness Directive (AD/DART/19) mandates corrective work on all Rolls‑Royce Dart RDa‑6 and RDa‑7 engines to address combustion air casing anti‑tear straps. Operators/owners must comply by following either Rolls‑Royce Service Bulletin Da 72‑475 Rev 1 or the earlier AD/RRT/32 Amdt 1. Technical steps, intervals and approvals are in those documents, and costs (parts, labour, downtime) and implementation choices fall to the engine owner/operator."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific known failure mode in a specific engine series. It has not expanded beyond its original purpose of mandating anti-tear strap installation."},"complexity_factors":["Extremely short document — only 8 substantive lines of regulatory text","No defined terms section — relies entirely on external references (Rolls-Royce Service Bulletin and prior AD)","Simple binary compliance path (two alternative methods)","No nested conditions, exceptions, or temporal triggers","Single mechanical modification requirement with no operational exemptions","Cross-references are explicit and limited to two documents"],"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 specific Rolls-Royce Dart aircraft engines to install **anti-tear straps** on the combustion air casing. These straps are structural reinforcements designed to prevent the engine casing from tearing or failing during operation.\n\n**Who it affects:** Anyone operating aircraft with **Dart RDa-6 or RDa-7 series engines** — these are turboprop engines commonly used in older regional aircraft like the Fokker F27 and some Vickers Viscount models.\n\n**What must be done:** Operators must follow one of two approved methods:\n- **Option 1:** Comply with Rolls-Royce Service Bulletin Da 72-475 (Revision 1) — this is the manufacturer's official repair instruction; **or**\n- **Option 2:** Follow an alternative directive called **AD/RRT/32 Amdt 1** (an earlier version of this safety requirement).\n\n**Why it matters:** This directive prevents catastrophic engine failure. The combustion air casing contains high-pressure hot gases. If it tears, it can cause uncontrolled engine damage, fire, or loss of aircraft control. The \"anti-tear straps\" act like structural seatbelts for the engine casing.\n\n**Compliance deadline:** As specified in whichever document the operator chooses to follow (the Rolls-Royce bulletin or the earlier AD).\n\n**Background note:** This directive (AD/DART/19) is essentially a reissue and consolidation of an earlier safety order (AD/RRT/32 Amdt 1), updated to reference current manufacturer guidance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dart-19-combustion-air-casing-anti-tear-straps","history":"/api/acts/ad-dart-19-combustion-air-casing-anti-tear-straps/history","analysis":"/api/acts/ad-dart-19-combustion-air-casing-anti-tear-straps/analysis","conflicts":"/api/acts/ad-dart-19-combustion-air-casing-anti-tear-straps/conflicts","importantCases":"/api/acts/ad-dart-19-combustion-air-casing-anti-tear-straps/important-cases","documents":"/api/acts/ad-dart-19-combustion-air-casing-anti-tear-straps/documents"}}