{"id":"F2006B08947","name":"AD/DH114/36 - Outer Engine Mounting Attachment Fittings - Inspection","slug":"ad-dh114-36-outer-engine-mounting-attachment-fittings-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52577,"registerId":"commonwealth-F2006B08947-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/36 - Outer Engine Mounting Attachment Fittings - 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\nAD/DH114/36 Outer Engine Mounting Attachment NK\n\nFittings - Inspection\n\n \n\nApplicability: All models.\n\n \n\nDocument: Hawker Siddeley TNS Heron (114) No. W.18, Issue 1.\n\n \n\nCompliance: Within 300 hours time in service after 31 May 1972 or before 30 September 1972, whichever occurs first.\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, single-issue airworthiness directive focused specifically on engine mounting inspections for one aircraft type. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Very 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 beyond the parent Civil Aviation Regulations 1998","Simple conditional logic (compliance deadline uses basic 'whichever occurs first' formula)","Single technical reference to external manufacturer document rather than detailed procedural requirements within the instrument itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft.\n\n**What it does:**\n- Requires owners and operators of **DH114 (Heron) series aeroplanes** to inspect the **outer engine mounting attachment fittings** — the metal brackets that hold the engines to the wings.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains a DH114 Heron aircraft (all models).\n\n**Why it matters:**\n- Engine mounting fittings are critical safety components. If they fail, an engine could detach from the wing in flight. This directive ensures these parts are checked for wear, cracks, or damage before a specific deadline.\n\n**What must be done:**\n- The inspection must be completed **within 300 hours of flying time after 31 May 1972**, or **before 30 September 1972** — whichever comes first.\n- The technical details of how to perform the inspection are found in **Hawker Siddeley Technical Note W.18, Issue 1**.\n\n**Key point:** This is a **time-critical safety requirement**. Aircraft cannot legally fly past the deadline without completing this inspection."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text provided sets a clear, single requirement (inspect outer engine mounting attachment fittings) that applies to all Heron models and specifies the compliance document and timing. There is no indication in the provided text that the directive’s scope has been changed from an earlier version; the directive as presented applies to all models and requires inspection per the referenced document within the stated time window."},"complexity_factors":["Short, narrowly framed requirement with a single, clear action (inspection).","Relies on an external technical document for inspection procedure (cross-reference increases operational complexity).","Tight and specific compliance window creates scheduling pressure for operators.","No procedural detail, enforcement mechanism or penalty set out in the text itself (implementation requires consulting regulator/Part 39 framework).","Broad applicability (\"All models\") increases the number of affected parties despite the simple instruction."],"plain_english_summary":"This directive mandates a one‑time inspection of the outer engine mounting attachment fittings on all Hawker Siddeley TNS Heron (114) aeroplanes, using the referenced Hawker Siddeley No. W.18, Issue 1 maintenance instruction.  \n\nIt imposes a short, fixed compliance window (within 300 flight hours after 31 May 1972 or before 30 Sept 1972), shifting inspection and any repair costs, downtime and scheduling burden onto aircraft operators, owners and maintenance organisations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-36-outer-engine-mounting-attachment-fittings-inspection","history":"/api/acts/ad-dh114-36-outer-engine-mounting-attachment-fittings-inspection/history","analysis":"/api/acts/ad-dh114-36-outer-engine-mounting-attachment-fittings-inspection/analysis","conflicts":"/api/acts/ad-dh114-36-outer-engine-mounting-attachment-fittings-inspection/conflicts","importantCases":"/api/acts/ad-dh114-36-outer-engine-mounting-attachment-fittings-inspection/important-cases","documents":"/api/acts/ad-dh114-36-outer-engine-mounting-attachment-fittings-inspection/documents"}}