{"id":"F2006B08698","name":"AD/DART/11 - Control Box Mounting Bolts - Inspection","slug":"ad-dart-11-control-box-mounting-bolts-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51874,"registerId":"commonwealth-F2006B08698-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DART/11 - Control Box Mounting Bolts - Inspection","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/11 Control Box Mounting Bolts - Inspection 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 76-A17 Rev 1; or\n\n \n\n2. AD/RRT/25.\n\n \n\nEffectivity: Forthwith.\n\n \n\nBackground: Reissue of AD/RRT/25.\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":2,"scope_assessment":{"changed":false,"description":"This is a straightforward reissue of an existing airworthiness directive (AD/RRT/25) with identical scope. The document explicitly states it is a 'Reissue' in the Background section, maintaining the same applicability (Dart RDa-6 and RDa-7 engines) and subject matter (control box mounting bolts). No expansion of scope has occurred."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 defined applicability criteria (engine model series)","Simple binary compliance path (follow SB OR follow previous AD)","No nested exceptions, conditional logic, or cross-references to other legislation beyond a single service bulletin","Single effective date requirement ('Forthwith') with no phased implementation","No interpretation section or defined terms"],"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) that requires specific maintenance actions on aircraft engines.\n\n**What it does:** It orders owners and operators of **Rolls-Royce Dart RDa-6 and RDa-7 series turbine engines** to inspect the **control box mounting bolts** on these engines. These bolts hold critical control components in place; if they fail, the engine could malfunction.\n\n**What you must do:** Operators have two options to comply:\n- **Option 1:** Follow the instructions in **Rolls-Royce Service Bulletin Da 76-A17 Revision 1** (a manufacturer-issued technical repair notice); **or**\n- **Option 2:** Comply with a different directive called **AD/RRT/25** (an earlier version of this same safety requirement).\n\n**When:** **Immediately** (\"Forthwith\" means without delay — as soon as practically possible).\n\n**Why it matters:** This directive was **reissued** to replace the earlier AD/RRT/25. The background suggests there was likely a safety concern with how these control box bolts were secured — possibly risk of loosening, corrosion, or failure that could affect engine control and flight safety.\n\n**Who it affects:** Airlines, charter operators, and maintenance organisations operating aircraft with these specific Rolls-Royce Dart engines (commonly used in older regional turboprop aircraft like the Fokker F27, HS 748, and Vickers Viscount)."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument states it is a reissue of AD/RRT/25 (Background). The applicability and operative requirement in this text mirror that reissued directive: it applies to all Dart RDa‑6 and RDa‑7 series engines and requires action per Rolls‑Royce SB Da 76‑A17 Rev 1 or AD/RRT/25 (Applicability; Requirement). The text provides no indication that the scope of affected engines or the compliance options has been expanded compared with the prior AD; therefore there is no visible change of scope in this reissue."},"complexity_factors":["Technical subject matter: requires inspection of engine control box mounting bolts on specific Rolls‑Royce Dart engine models (Applicability).","Dependency on external technical documents: the AD refers operators to Rolls‑Royce SB Da 76‑A17 Rev 1 or AD/RRT/25 for the substantive inspection and corrective steps (Requirement).","Urgent timing: effectivity is 'Forthwith', which raises scheduling and operational constraints for operators (Effectivity).","Limited on‑face detail: the AD does not include inspection procedures, intervals or acceptance criteria, increasing reliance on the referenced documents (Requirement).","Regulatory provenance: issued under the Civil Aviation Safety Authority schedule of airworthiness directives, so compliance is a regulatory obligation even though technical content is external (header and Requirement)."],"plain_english_summary":"Operators and maintenance organisations of Rolls‑Royce Dart RDa‑6 and RDa‑7 engines must immediately inspect control‑box mounting bolts and carry out any corrective work as specified in Rolls‑Royce Service Bulletin Da 76‑A17 Rev 1 or by complying with the earlier AD/RRT/25. \n\nThe directive is effective forthwith, reissuing the previous AD; it imposes an urgent compliance and administrative burden on affected aircraft owners/operators to obtain and follow the referenced technical instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dart-11-control-box-mounting-bolts-inspection","history":"/api/acts/ad-dart-11-control-box-mounting-bolts-inspection/history","analysis":"/api/acts/ad-dart-11-control-box-mounting-bolts-inspection/analysis","conflicts":"/api/acts/ad-dart-11-control-box-mounting-bolts-inspection/conflicts","importantCases":"/api/acts/ad-dart-11-control-box-mounting-bolts-inspection/important-cases","documents":"/api/acts/ad-dart-11-control-box-mounting-bolts-inspection/documents"}}