{"id":"F2006B08945","name":"AD/DH114/34 Amdt 1 - Fuselage Keel Frame at Wing Rear Spar - Inspection","slug":"ad-dh114-34-amdt-1-fuselage-keel-frame-at-wing-rear-spar-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52568,"registerId":"commonwealth-F2006B08945-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/34 Amdt 1 - Fuselage Keel Frame at Wing Rear Spar - 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/DH114/34\n\nAmdt 1\n\nApplicability: All models.\n\n\n# Fuselage Keel Frame at Wing NK Rear Spar - Inspection\n\n \n\nDocument: Hawker Siddeley TNS Heron (114) No. F.17, Issue 1.\n\n \n\nCompliance: Within 25 hours time in service or thirty days, after 1 May 1972 whichever occurs first and thereafter at intervals not exceeding 600 hours time in service.\n\n \n\nNote: Inspections performed in accordance with the preceding issue of this Directive may be regarded as the initial inspection required by para. 3 of the requirement document.\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 narrow, technical safety directive focused on a specific aircraft type and structural inspection. It has not expanded beyond its original purpose of ensuring airworthiness of the DH114 Heron fleet."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only one defined term implied ('time in service' — standard aviation term)","No cross-references to other legislation beyond the enabling regulation (CAR 1998 Part 39)","Single compliance pathway with clear timeframes (25 hours/30 days, then 600 hours)","One simple exception/note regarding prior compliance","Technical content refers to external engineering document rather than reproducing complex procedures"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nThis directive requires owners and operators of **de Havilland DH114 Heron series aeroplanes** to inspect a specific structural component — the **fuselage keel frame where it meets the wing rear spar** — for cracks or damage.\n\n**Who it affects:**\n- Anyone who owns or operates a DH114 Heron aircraft (all models)\n- Maintenance engineers responsible for keeping these planes airworthy\n\n**What must be done:**\n- **First inspection:** Within 25 flight hours or 30 days after 1 May 1972 (whichever comes first)\n- **Repeat inspections:** Every 600 flight hours thereafter\n- **How:** Follow the technical instructions in Hawker Siddeley document TNS Heron (114) No. F.17, Issue 1\n\n**Why it matters:**\nThe keel frame is a critical structural part connecting the fuselage to the wing. If it fails, the wing could separate from the body of the aircraft. This AD was issued to catch fatigue cracks before they become catastrophic. The \"Amdt 1\" (Amendment 1) indicates this is an updated version of an earlier directive — if you already did the inspection under the old rules, that counts as your first inspection.\n\n**In short:** If you fly a Heron, you must check this specific joint for cracks regularly, starting by mid-1972 at the latest, then every 600 hours of flying time."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The amendment sets a specific inspection timetable for all DH114 models and explicitly permits inspections done under the preceding issue to count as the initial inspection. The Directive does not, in its text, expand or narrow the class of aircraft affected (Applicability remains “All models”) nor add new structural items to be inspected. The Note indicates continuity with the prior issue (previous inspections may be regarded as the initial inspection), so there is no evident change of scope in the AD text itself."},"complexity_factors":["Narrow, specific technical scope (fuselage keel frame at wing rear spar) which reduces breadth of issues.","Clear, prescriptive timing requirements (25 hours/30 days initial; 600 hours recurring) simplifying compliance scheduling.","Reliance on an external technical document (Hawker Siddeley TNS Heron No. F.17, Issue 1) for procedural detail — requires obtaining and following that document.","Short note allowing prior inspections to be credited reduces procedural friction for some operators.","The AD text omits who conducts the inspection, how it must be recorded, and enforcement detail, creating practical ambiguity that must be resolved through regulatory practice or the referenced document."],"plain_english_summary":"This AD requires inspection of the fuselage keel frame at the wing rear spar on all DH114 (Heron) models, to be carried out per Hawker Siddeley TNS Heron (114) No. F.17, Issue 1.\n\nAn initial inspection is due within 25 hours TIS or 30 days after 1 May 1972 (whichever comes first) and then at intervals not exceeding 600 hours; prior inspections under the previous issue may satisfy the initial check."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-34-amdt-1-fuselage-keel-frame-at-wing-rear-spar-inspection","history":"/api/acts/ad-dh114-34-amdt-1-fuselage-keel-frame-at-wing-rear-spar-inspection/history","analysis":"/api/acts/ad-dh114-34-amdt-1-fuselage-keel-frame-at-wing-rear-spar-inspection/analysis","conflicts":"/api/acts/ad-dh114-34-amdt-1-fuselage-keel-frame-at-wing-rear-spar-inspection/conflicts","importantCases":"/api/acts/ad-dh114-34-amdt-1-fuselage-keel-frame-at-wing-rear-spar-inspection/important-cases","documents":"/api/acts/ad-dh114-34-amdt-1-fuselage-keel-frame-at-wing-rear-spar-inspection/documents"}}