{"id":"F2006B08941","name":"AD/DH114/30 - Main Undercarriage - Inspection","slug":"ad-dh114-30-main-undercarriage-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52552,"registerId":"commonwealth-F2006B08941-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/30 - Main Undercarriage - 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/DH114/30 Main Undercarriage - Inspection NK Applicability:              All models fitted with down lock operating lever assemblies P/N 14-2U. 181A/1. Document:              Hawker Siddeley TNS Heron (114) No. U.12 Issue 1.\n\nCompliance: As detailed in 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\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on the text provided, the AD's scope is explicit and limited to DH114/Heron aircraft fitted with the down lock operating lever assembly P/N 14-2U (\"Applicability: All models fitted with down lock operating lever assemblies P/N 14-2U\"). The instrument delegates technical requirements to the named manufacturer document and does not indicate any alteration or expansion of that scope within the text supplied."},"complexity_factors":["Short, single-issue directive with narrow applicability (specific part-number P/N 14-2U).","Procedural detail entirely delegated to an external manufacturer document (Hawker Siddeley TNS Heron No. U.12 Issue 1), requiring operators to obtain and interpret that document.","Technical content (undercarriage inspection) requires qualified maintenance personnel and potential parts/repair capability.","Limited ambiguity in who is affected, but lack of procedural detail in the AD increases operational coordination burden.","Dependency on availability and clarity of the referenced requirement document for compliance timing, acceptance criteria, and remedial actions."],"plain_english_summary":"This instrument is an airworthiness directive titled \"AD/DH114/30 — Main Undercarriage - Inspection\" issued under the Commonwealth of Australia (Civil Aviation Regulations 1998), Part 39, by the Civil Aviation Safety Authority (header). Mechanically, it does three things:\n\n- Identifies the affected fleet: all Hawker Siddeley DH114 (Heron) series aeroplanes that are fitted with the down lock operating lever assembly part-numbered 14-2U (\"Applicability: All models fitted with down lock operating lever assemblies P/N 14-2U\").\n- Specifies the procedural source to follow: the inspection and any associated actions are set out in the manufacturer document \"Hawker Siddeley TNS Heron (114) No. U.12 Issue 1\" (\"Document: Hawker Siddeley TNS Heron (114) No. U.12 Issue 1\").\n- Directs compliance to the referenced procedure: \"Compliance: As detailed in requirement document.\"\n\nWho this affects and what they must do\n\n- Aircraft operators and owners of DH114/Heron aeroplanes that have the specific part (P/N 14-2U) must carry out the inspection and any follow-on tasks set out in the referenced requirement document.\n- Maintenance organisations and licensed engineers who perform inspections and repairs will need to apply the procedures in the Hawker Siddeley document.\n\nWho pays and who decides\n\n- The immediate financial and operational costs (labour, inspection time, any parts and repairs, and any aircraft down-time) fall to the aircraft owners/operators and their maintenance providers. (Source: the AD's applicability and compliance wording.)\n- The Civil Aviation Safety Authority is the issuing authority (header). The detailed inspection steps and technical requirements are defined in the manufacturer-issued requirement document cited in the AD (\"Hawker Siddeley TNS Heron (114) No. U.12 Issue 1\").\n\nMechanical effects on behaviour and operations\n\n- Operators must obtain and follow the referenced requirement document and allocate maintenance resources to complete the inspection and any corrective action the document specifies.\n- Completing the inspection may remove an aircraft from service temporarily, impose recurring inspection or repair costs, or require replacement of the specified part if the requirement document calls for that.\n\nImplementation, compliance burden and risks\n\n- The AD itself is short and delegates procedural detail to the referenced manufacturer document; this creates a dependency on that external document for work scope, intervals, acceptance criteria and remedial steps (\"Compliance: As detailed in requirement document\"; \"Document: Hawker Siddeley TNS Heron (114) No. U.12 Issue 1\").\n- Practical compliance therefore requires access to the manufacturer document, suitably qualified maintenance personnel, and parts or repair capability for P/N 14-2U.\n- Potential operational impacts include inspection-related aircraft downtime and associated scheduling or commercial disruptions. Any replacement or repair costs will be borne by owners/operators.\n\nTrade-offs and incentive structure (mechanical, not normative)\n\n- The AD concentrates technical direction (inspection procedure) in a single manufacturer document, so operators trade off straightforwardness in following an authoritative procedure against the need to rely on that external document and its availability.\n- The specificity of the affected component (P/N 14-2U) means costs fall on operators who use that part; suppliers and repair organisations that service that part may see demand for inspections, repairs, or replacement parts.\n\nKey text citations from the instrument\n\n- Issuer and legal context: \"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\" (header).\n- AD identifier and subject: \"AD/DH114/30 Main Undercarriage - Inspection\".\n- Applicability: \"All models fitted with down lock operating lever assemblies P/N 14-2U.\"\n- Requirement document: \"Hawker Siddeley TNS Heron (114) No. U.12 Issue 1.\"\n- Compliance instruction: \"As detailed in requirement document.\"\n\nIn short: the directive requires operators of DH114/Heron aircraft fitted with the specific down-lock lever assembly to perform inspections and any follow-up actions set out in the cited Hawker Siddeley document. The operator bears the compliance costs and must rely on that external document for technical detail."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive focused on a specific mechanical inspection. It has not expanded beyond its original purpose of mandating a safety inspection for a particular aircraft part."},"complexity_factors":["Extremely short document (approximately 150 words of substantive content)","No defined terms section — relies entirely on external technical reference document","Single, straightforward applicability criterion (specific part number)","No conditional logic, exceptions, or nested provisions","Compliance requirement simply defers to external technical document ('As detailed in requirement document')","No cross-references to other legislation beyond basic enabling regulation (Civil Aviation Regulations 1998, Part 39)"],"plain_english_summary":"**What this is:** 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:** It requires owners and operators of **DH114 (Heron) series aeroplanes** to inspect the **main undercarriage** (the main landing gear that supports the aircraft on the ground). Specifically, it targets aircraft fitted with a particular part: **down lock operating lever assemblies** with part number **14-2U.181A/1**.\n\n**Why it matters:** Airworthiness Directives are legally binding safety instructions. If you own or operate one of these aircraft, you **must** follow the inspection requirements detailed in the referenced technical document (Hawker Siddeley TNS Heron No. U.12 Issue 1). Failing to comply means the aircraft cannot legally fly in Australian airspace. These directives are typically issued when a safety defect or potential failure mode has been identified that could affect flight safety.\n\n**Who it affects:**\n- Owners and operators of DH114 Heron aircraft with the specified down lock lever assembly\n- Licensed aircraft maintenance engineers who perform the inspections\n- CASA, which enforces compliance"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-30-main-undercarriage-inspection","history":"/api/acts/ad-dh114-30-main-undercarriage-inspection/history","analysis":"/api/acts/ad-dh114-30-main-undercarriage-inspection/analysis","conflicts":"/api/acts/ad-dh114-30-main-undercarriage-inspection/conflicts","importantCases":"/api/acts/ad-dh114-30-main-undercarriage-inspection/important-cases","documents":"/api/acts/ad-dh114-30-main-undercarriage-inspection/documents"}}