{"id":"F2006B08965","name":"AD/DH114/8 - Centre Section Spar Boom Inspection for Chafing","slug":"ad-dh114-8-centre-section-spar-boom-inspection-for-chafing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52548,"registerId":"commonwealth-F2006B08965-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/8 - Centre Section Spar Boom Inspection for Chafing","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)  DH114 (Heron) Series Aeroplanes\n\n \n\nAD/DH114/8 Centre Section Spar Boom Inspection for Chafing NK\n\nApplicability: All models not modified in accordance with DH Heron Mod. No. 604. Document:  De Havilland TNS Series Heron (114) No. F.10, Issue 2.\n\nCompliance: Before 31 December 1960.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1960 addressing a specific technical issue on a specific aircraft type. It has not expanded beyond its original narrow scope of requiring a one-time inspection for chafing on unmodified DH114 Herons."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 4 operative provisions: applicability, document reference, compliance deadline, and subject matter","No defined terms section","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single condition (applicability exclusion for modified aircraft)","No nested exceptions or conditional logic"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\n- Requires owners and operators of **De Havilland DH114 Heron series aeroplanes** to inspect the **centre section spar boom** (a structural component in the middle of the aircraft wing/fuselage area) for **chafing** (wear caused by rubbing or friction).\n\n**Who it affects:**\n- All DH114 Heron aircraft **that have NOT been modified** according to \"DH Heron Modification No. 604\".\n\n**What must be done:**\n- The inspection must be carried out **before 31 December 1960**.\n- The technical details of how to perform this inspection are found in a specific De Havilland technical document: **TNS Series Heron (114) No. F.10, Issue 2**.\n\n**Why it matters:**\n- Spar booms are critical structural elements. Chafing can weaken the airframe and potentially lead to structural failure. This directive ensures a specific safety defect is identified and addressed before a deadline, preventing accidents."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text gives a focused, single-purpose requirement (inspect centre section spar boom for chafing) with a clear applicability rule and deadline. There is no internal text indicating an expansion or narrowing of scope from an earlier version; the instrument itself does not show any change to scope from an original intent."},"complexity_factors":["Narrow subject-matter: single inspection requirement (centre section spar boom chafing).","Clear, single compliance deadline (Before 31 December 1960).","Narrow applicability with a single explicit exclusion (aircraft modified per Mod. No. 604).","Procedural detail is external (references De Havilland TNS Series Heron (114) No. F.10, Issue 2), requiring operators to obtain and follow another document.","No phased implementation, discretionary provisions, or complex compliance schedules in the text.","Historical timing in the text (1960) makes operational relevance time-bound."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of De Havilland Heron (DH114) aeroplanes — except those already modified by DH Heron Mod. No. 604 — to have the centre‑section spar boom inspected for chafing using the manufacturer’s procedure (De Havilland TNS Series Heron No. F.10, Issue 2) by 31 December 1960. The regulator enforces the one‑time, date‑certain obligation; affected operators must arrange and pay for the inspection, creating an incentive to adopt Mod. No. 604 where available."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-8-centre-section-spar-boom-inspection-for-chafing","history":"/api/acts/ad-dh114-8-centre-section-spar-boom-inspection-for-chafing/history","analysis":"/api/acts/ad-dh114-8-centre-section-spar-boom-inspection-for-chafing/analysis","conflicts":"/api/acts/ad-dh114-8-centre-section-spar-boom-inspection-for-chafing/conflicts","importantCases":"/api/acts/ad-dh114-8-centre-section-spar-boom-inspection-for-chafing/important-cases","documents":"/api/acts/ad-dh114-8-centre-section-spar-boom-inspection-for-chafing/documents"}}