{"id":"F2006B08963","name":"AD/DH114/6 Amdt 2 - Mainplane Upper and Lower Spar Booms - Inspection","slug":"ad-dh114-6-amdt-2-mainplane-upper-and-lower-spar-booms-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52541,"registerId":"commonwealth-F2006B08963-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/6 Amdt 2 - Mainplane Upper and Lower Spar Booms - 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)  DH114 (Heron) Series Aeroplanes\n\n \n\n# AD/DH114/6\n\nAmdt 2\n\nApplicability: All models.\n\n\n# Mainplane Upper and Lower NK Spar Booms - Inspection\n\n \n\nRequirement: 1. Inspect the wing main spar upper and lower booms from outboard of the main fuel tank bays to the tip (i.e. from ribs 04 to 22 rear, and from ribs 03A to 22 front), in accordance with De Havilland and TNS No. W7, Issue 2.\n\n \n\n2. Inspect the wing main spar upper and lower booms in the area of the main fuel tank bays (i.e. from ribs 01 to 04 rear and from ribs 01 to 03A front) in accordance with De Havilland TNS No. W7, Issue 2.\n\n \n\nCompliance: For para. 1:\n\n \n\n(a)     Aircraft not modified in accordance with Heron Mod. No. 790 or No. 779 - at intervals not exceeding 6 months.\n\n \n\n(b)     Aircraft modified in accordance with Heron Mod. No. 790 or No. 779 - at intervals not exceeding 12 months.\n\n \n\nFor para. 2:\n\n \n\n(a)     If corrosion is found to be present on the upper or lower spar booms during inspection in accordance with para. 1 of this Directive - before further flight.\n\n \n\n(b)     Otherwise at intervals not exceeding those specified in De Havilland Heron Recommended Maintenance Schedule for removal of the fuel tanks.\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_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing Airworthiness Directive. The scope remains tightly focused on the original purpose: inspecting wing spar booms on DH114 Heron aircraft. The amendment appears to maintain the same structural inspection requirements, likely updating reference documents or compliance intervals based on operational experience. There is no evidence of scope creep into unrelated aircraft systems or types."},"complexity_factors":["Short, single-purpose document (approximately 300 words)","Only 2 defined technical references (Heron Mod. No. 790 and 779, De Havilland TNS No. W7 Issue 2)","Simple conditional logic: two-tier compliance schedule based on modification status (modified vs unmodified aircraft)","Nested condition for paragraph 2 (corrosion found vs not found)","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Technical aviation terminology requires domain knowledge but is standard for the industry (spar booms, ribs, fuel tank bays)","Clear, numbered structure with distinct applicability, requirement, and compliance sections"],"plain_english_summary":"Owners, operators and maintenance engineers of De Havilland DH114 Heron aircraft must carry out recurring inspections of wing spar booms per De Havilland TNS No. W7, Issue 2 to detect corrosion or fatigue.  \n\nInspections cover inboard and outboard spar areas; intervals are typically 6 months (or 12 months if modified by Heron Mod 790/779), with immediate checks of the main tank area if corrosion is found. The rule prevents wing failure by catching damage early."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument is titled as Amendment 2 (Amdt 2), indicating it amends an earlier AD. It specifies inspection areas, methods (De Havilland TNS No. W7, Issue 2), and differentiated intervals for aircraft modified under Heron Mod. No. 790/779. Without the prior AD text, exact differences cannot be determined from this document alone."},"complexity_factors":["Applicability to all DH114 models but with different intervals depending on modification status (Heron Mod. No. 790 or No. 779) — creates branching compliance paths (Compliance para.1(a)/(b)).","Specific inspection locations defined by rib ranges (outboard of main fuel tank bays to tip: ribs 04–22 rear and 03A–22 front; fuel tank bay area: ribs 01–04 rear and 01–03A front) — requires precise structural access and records.","Condition‑triggered action: finding corrosion during routine inspection requires inspection of tank‑bay area before further flight — immediate operational impact and potential grounding risk (para.2(a)).","Relies on external technical documents for method and intervals (De Havilland TNS No. W7, Issue 2; De Havilland Heron Recommended Maintenance Schedule) — compliance depends on access to and interpretation of manufacturer materials.","Timing complexity: sets fixed short intervals (6 or 12 months) for broad areas and ties some inspections to variable maintenance events (fuel tank removal) — scheduling and potential increased downtime for operators."],"plain_english_summary":"This Airworthiness Directive requires operators of all de Havilland DH114 (Heron) aircraft to inspect the wing main spar upper and lower booms across specified rib ranges, using De Havilland TNS No. W7, Issue 2. It sets recurring inspection intervals and requires immediate inspection before further flight if corrosion is found.\n\nIt treats aircraft modified by Heron Mod. No. 790 or No. 779 differently (longer intervals) and links some checks to fuel‑tank removal schedules, increasing maintenance actions, downtime and costs for operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-6-amdt-2-mainplane-upper-and-lower-spar-booms-inspection","history":"/api/acts/ad-dh114-6-amdt-2-mainplane-upper-and-lower-spar-booms-inspection/history","analysis":"/api/acts/ad-dh114-6-amdt-2-mainplane-upper-and-lower-spar-booms-inspection/analysis","conflicts":"/api/acts/ad-dh114-6-amdt-2-mainplane-upper-and-lower-spar-booms-inspection/conflicts","importantCases":"/api/acts/ad-dh114-6-amdt-2-mainplane-upper-and-lower-spar-booms-inspection/important-cases","documents":"/api/acts/ad-dh114-6-amdt-2-mainplane-upper-and-lower-spar-booms-inspection/documents"}}