{"id":"F2006B08985","name":"AD/DHA-3/28 - Centre Section Main Spar Upper Boom Attach Fitting - Inspection","slug":"ad-dha-3-28-centre-section-main-spar-upper-boom-attach-fitting-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52608,"registerId":"commonwealth-F2006B08985-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHA-3/28 - Centre Section Main Spar Upper Boom Attach Fitting - 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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  DHA-3 (Drover) Series Aeroplanes\n\n \n\nAD/DHA-3/28 Centre Section Main Spar Upper Boom\n\nAttach Fitting - Inspection\n\n\n3/74\n\n \n\nApplicability: All models.\n\n \n\nRequirement: Visually inspect the visible spaces of the centre section main spar upper boom LH and RH wing attach fitting for cracks, particularly for those which may originate at the bushing holes of the front and rear lugs.\n\n \n\nCompliance: Before 1 May 1974, and thereafter at intervals not exceeding 1 year.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The document itself sets a single, narrow obligation (an annual visual inspection of the centre section main spar upper boom wing attach fittings for cracks) and specifies applicability to all models. There is no indication within the supplied text that the scope has been expanded or reduced from an earlier version; the directive as supplied defines its scope directly (see \"Applicability\", \"Requirement\", \"Compliance\")."},"complexity_factors":["Short, focused directive with a single operative requirement (visual inspection of specified fittings).","Clear applicability: \"All models\" reduces interpretive scope.","Fixed compliance schedule (initial date and then annual) simplifies implementation planning.","Lack of technical detail on inspection technique, acceptance criteria, reporting, or who must perform the inspection creates practical ambiguity for implementers.","No repair, reporting, or enforcement procedures in the text increases reliance on external maintenance standards or regulator guidance.","Terminology such as \"visible spaces\" and reference to cracks \"which may originate at the bushing holes\" could be open to differing operational interpretations."],"plain_english_summary":"This directive requires operators of all DHA‑3 (Drover) series aeroplanes to carry out a visual inspection of the centre‑section main spar upper‑boom LH and RH wing‑attach fittings—focusing on cracks at bushing holes—with the first inspection due before 1 May 1974 and then at least annually.  \n\nThe operator or maintenance organisation must arrange and pay for inspections; the text sets the inspection and interval but does not prescribe repair actions, reporting, specific techniques, or enforcement details."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose airworthiness directive focused on a specific safety-critical inspection for one aircraft type. It has not expanded beyond its original intent; it remains a targeted maintenance requirement issued in response to a known or suspected airworthiness concern with the DHA-3 Drover's wing attach fittings."},"complexity_factors":["Extremely short document (approximately 150 words of substantive content)","Only 4 defined elements: applicability, requirement, compliance, and the specific aircraft part","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Simple, unidirectional obligation: inspect → report findings → repeat annually","No conditional logic, exceptions, or alternative compliance methods","Single, specific technical scope (one aircraft type, one component, one inspection method)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nIt requires owners and operators of **DHA-3 Drover series aeroplanes** (a type of aircraft) to conduct a specific safety inspection.\n\n**The inspection:**\nA visual check of the **centre section main spar upper boom attach fittings** on both the left-hand (LH) and right-hand (RH) wings. Inspectors must look for **cracks**, especially those that might start at the bushing holes of the front and rear lugs (metal connection points where the wing attaches to the aircraft body).\n\n**Who it affects:**\nAnyone who owns, operates, or maintains a DHA-3 Drover aircraft — all models are covered.\n\n**When it must be done:**\n- **First inspection:** Before 1 May 1974\n- **Ongoing:** Every 12 months thereafter\n\n**Why it matters:**\nCracks in wing attach fittings are extremely serious — they could lead to **structural failure** and potentially cause the wing to separate from the aircraft. This directive ensures potential fatigue cracks are caught before they become catastrophic."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dha-3-28-centre-section-main-spar-upper-boom-attach-fitting-inspection","history":"/api/acts/ad-dha-3-28-centre-section-main-spar-upper-boom-attach-fitting-inspection/history","analysis":"/api/acts/ad-dha-3-28-centre-section-main-spar-upper-boom-attach-fitting-inspection/analysis","conflicts":"/api/acts/ad-dha-3-28-centre-section-main-spar-upper-boom-attach-fitting-inspection/conflicts","importantCases":"/api/acts/ad-dha-3-28-centre-section-main-spar-upper-boom-attach-fitting-inspection/important-cases","documents":"/api/acts/ad-dha-3-28-centre-section-main-spar-upper-boom-attach-fitting-inspection/documents"}}