{"id":"F2006B08934","name":"AD/DH114/24 - Nose Undercarriage - Inspection and Modification","slug":"ad-dh114-24-nose-undercarriage-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52521,"registerId":"commonwealth-F2006B08934-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/24 - Nose Undercarriage - Inspection and Modification","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/DH114/24 Nose Undercarriage - Inspection and Modification NK\n\nApplicability: All Series 2 aeroplanes not incorporating Heron Mod. 1093. Document: Hawker Siddeley TNS Heron (114) No. U.13.\n\nCompliance: Inspection: Within 100 hours time in service after 29 May 1970 and thereafter at intervals not exceeding 100 hours time in service until modified.\n\n \n\nModification: Before 1 August 1970.\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 nose undercarriage safety for one aircraft series. It has not expanded beyond its original technical scope."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 operative requirements (inspection and modification)","Single applicability criterion (Series 2 aircraft without Mod. 1093)","No defined terms section","No cross-references to other legislation beyond the enabling regulation (CAR 1998 Part 39)","Simple temporal compliance structure (hours in service and calendar date)","Single technical reference document (Hawker Siddeley TNS Heron No. U.13)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for a specific type of aircraft: the **de Havilland DH114 Heron** (a British twin-engine airliner from the 1950s).\n\n**What it requires:**\n- **Who must comply:** Owners and operators of Series 2 Heron aircraft that haven't already been modified with \"Heron Mod. 1093\"\n- **What must be done:** Two things:\n  1. **Inspection:** Check the nose undercarriage (nose landing gear) within 100 flight hours after 29 May 1970, then re-inspect every 100 flight hours until the modification is done\n  2. **Modification:** Install the required modification before 1 August 1970\n\n**Why it matters:**\nThis directive addresses a safety defect in the nose landing gear of these aircraft. The repetitive inspections are a temporary safety measure until a permanent fix (the modification) is installed. The tight deadline (modification required before August 1970) suggests this was considered a serious safety issue requiring urgent attention.\n\n**Note:** This directive dates from 1970 and applies to a very specific, now-obsolete aircraft type. It would only be relevant today for historical aircraft preservation or museum operations."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied AD sets a specific applicability and compliance schedule; the text does not indicate any change from an earlier or different scope. No information in the provided document suggests the scope has been altered from a prior intent."},"complexity_factors":["Clear, limited applicability: only Series 2 aircraft without Heron Mod. 1093 (Applicability)","Fixed, short inspection interval (every 100 hours) and a hard calendar deadline for the one-off modification (Compliance: Inspection; Modification)","Mandatory reliance on an external technical document for procedures and details (Hawker Siddeley TNS Heron (114) No. U.13) increases the steps needed to comply (Document)","Operational/logistical burden of repeating inspections until modification is fitted (Compliance: Inspection)","Regulatory inflexibility: AD prescribes deadlines and intervals with little room for alternate methods (Applicability; Compliance: Inspection; Modification)"],"plain_english_summary":"This Airworthiness Directive applies to Hawker Siddeley DH114 Heron Series 2 aeroplanes without Mod. 1093, requiring inspections of the nose undercarriage every 100 flight hours from 29 May 1970 until a one‑off modification is fitted.  \n\nThe mandated modification must be completed before 1 August 1970 using Hawker Siddeley TNS Heron No. U.13 procedures; owners/operators and maintenance organisations bear the cost and scheduling burden to remain compliant."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-24-nose-undercarriage-inspection-and-modification","history":"/api/acts/ad-dh114-24-nose-undercarriage-inspection-and-modification/history","analysis":"/api/acts/ad-dh114-24-nose-undercarriage-inspection-and-modification/analysis","conflicts":"/api/acts/ad-dh114-24-nose-undercarriage-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-dh114-24-nose-undercarriage-inspection-and-modification/important-cases","documents":"/api/acts/ad-dh114-24-nose-undercarriage-inspection-and-modification/documents"}}