{"id":"F2006B09303","name":"AD/DO-27/8 - Wing Fuselage Attachment - Inspection","slug":"ad-do-27-8-wing-fuselage-attachment-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53396,"registerId":"commonwealth-F2006B09303-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DO-27/8 - Wing Fuselage Attachment - 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)  Dornier DO-27 Series Aeroplanes\n\n \n\nAD/DO-27/8  Wing Fuselage Attachment - Inspection NK Applicability:              All D0-27Q and H series not modified in accordance with Dornier TB no. 27-33. Document:               Dornier TB No. 27-33.\n\nCompliance: Within 100 hours time in service after 15 April 1969 and thereafter at intervals not exceeding 100 hours time in service.\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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The provided text sets a clear, narrow scope: inspections apply to all DO‑27Q and DO‑27H series aircraft unless modified per Dornier TB No. 27‑33, with inspections required within 100 hours after 15 April 1969 and every 100 hours thereafter (Applicability; Document; Compliance). The document contains no text indicating a change from that original scope."},"complexity_factors":["Narrow, specific applicability (only DO‑27Q and DO‑27H series not modified per TB No. 27‑33). (Applicability)","Simple, fixed inspection interval (every 100 hours time in service). (Compliance)","Dependence on a single external technical document for procedure and for the modification exception (Dornier TB No. 27‑33). (Document)","Operational logistics: need to track time‑in‑service hours and schedule recurrent inspections (administrative burden). (Compliance)","Potential ambiguity limited to verifying whether an aircraft has been modified \"in accordance with\" the referenced TB (verification burden). (Applicability & Document)"],"plain_english_summary":"What this instrument does mechanically\n\n- It is an Airworthiness Directive issued under the Civil Aviation Safety Authority (header). The Directive requires inspection of the wing-to-fuselage attachment on specified Dornier DO‑27 aeroplanes. (See: \"Applicability\" and \"Compliance\" sections.)\n\nWho is affected\n\n- Owners and operators of Dornier DO‑27Q and DO‑27H series aeroplanes that have not been modified in accordance with Dornier Technical Bulletin No. 27‑33. (Applicability)\n\nWhat actions are required and when\n\n- Inspect the wing fuselage attachment within 100 hours time in service after 15 April 1969, and then repeat the inspection at intervals not exceeding 100 hours time in service. (Compliance)\n- If the aircraft has already been modified in accordance with Dornier TB No. 27‑33, the Directive does not apply. (Applicability & Document)\n- The technical detail and any modification or inspection procedures are those set out in Dornier TB No. 27‑33 (the referenced document). (Document)\n\nWho pays and who decides\n\n- The operator/owner of each affected aircraft must arrange and pay for the inspections or the modification specified in the Dornier technical bulletin. (Applicability & Compliance)\n- The directive is issued under the Civil Aviation Safety Authority (header), which is the issuing regulator; compliance is the responsibility of the aircraft owner/operator. (header)\n\nIncentives and behavioural effects\n\n- The rule creates a recurring, time‑based compliance obligation (inspection every 100 hours) that operators must schedule into maintenance cycles. (Compliance)\n- Operators have the option to remove the inspection obligation for a particular aeroplane by carrying out the modification described in Dornier TB No. 27‑33; that imposes an upfront cost but eliminates the recurring inspection requirement for aircraft modified as specified. (Applicability & Document)\n\nCompliance burden and practical risks\n\n- Direct costs are inspection labour, any required parts, and/or the cost of performing the Dornier TB No. 27‑33 modification. (Applicability, Document & Compliance)\n- Administrative burdens include tracking time‑in‑service hours and scheduling inspections every 100 hours. (Compliance)\n- Implementation risk centres on operators having access to Dornier TB No. 27‑33 and the technical capability to perform the inspection or modification to the standard it specifies. (Document)\n\nTrade‑offs and mechanics (source‑grounded)\n\n- The Directive replaces an open choice (no mandated inspection) with either: (a) recurring inspections at specified time intervals, or (b) a one‑off modification that, if performed to the referenced standard, removes an aeroplane from the Directive's applicability. (Applicability & Compliance)\n- Who bears costs: the aircraft owner/operator pays for inspections or the modification. (Applicability & Compliance)\n- Who decides: the regulator (Civil Aviation Safety Authority) issued the requirement; the owner/operator decides whether to comply by recurring inspections or to undertake the modification referenced. (header, Applicability & Document)\n\nSource citations\n\n- Issuing authority and program: \"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES\" (header).\n- Applicability: \"All DO‑27Q and H series not modified in accordance with Dornier TB no. 27‑33.\" (Applicability)\n- Referenced technical document: \"Dornier TB No. 27‑33.\" (Document)\n- Timing and intervals: \"Within 100 hours time in service after 15 April 1969 and thereafter at intervals not exceeding 100 hours time in service.\" (Compliance)\n\nNote on purpose claims\n\n- The instrument is issued as an Airworthiness Directive (header), which by form and placement signals an objective of preserving airworthiness through the specified inspections or modifications. That stated objective is implemented by the inspection schedule and the alternative of modification; the practical costs, scheduling effects, and need for access to the referenced technical bulletin follow from those mechanics. (header, Applicability, Document, Compliance)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1969 addressing a specific structural inspection requirement. It has not expanded beyond its original purpose of ensuring wing attachment integrity on particular Dornier aircraft models."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","Zero defined terms within the document itself (relies on external aviation terminology)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998 citation","Simple conditional logic: applies to specific aircraft models UNLESS already modified per Dornier TB 27-33","Single compliance requirement with clear time trigger (100 hours time in service) and repeating interval","No nested exceptions or sub-exceptions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific **Dornier DO-27 aircraft** (the Q and H series models that haven't been modified according to a particular Dornier technical bulletin).\n\n**What it requires:**\n- **Inspection of the wing-to-fuselage attachment points** — the critical structural connections where the wings bolt onto the main body of the aircraft\n- **When:** First inspection must happen within 100 hours of flying time after 15 April 1969, then repeated every 100 hours of flight time thereafter\n\n**Why it matters:**\nWing attachment failures are catastrophic. This directive forces operators to regularly check these high-stress joints for cracks, corrosion, or wear before they become dangerous. It's a preventive measure to stop the wings from separating from the fuselage in flight.\n\n**Who it affects:**\n- Owners and operators of Dornier DO-27Q and DO-27H aircraft\n- Maintenance engineers servicing these planes\n- Anyone flying in these aircraft (indirectly, via improved safety)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-27-8-wing-fuselage-attachment-inspection","history":"/api/acts/ad-do-27-8-wing-fuselage-attachment-inspection/history","analysis":"/api/acts/ad-do-27-8-wing-fuselage-attachment-inspection/analysis","conflicts":"/api/acts/ad-do-27-8-wing-fuselage-attachment-inspection/conflicts","importantCases":"/api/acts/ad-do-27-8-wing-fuselage-attachment-inspection/important-cases","documents":"/api/acts/ad-do-27-8-wing-fuselage-attachment-inspection/documents"}}