{"id":"F2006B08940","name":"AD/DH114/3 - ASI Drain Cocks - Modification","slug":"ad-dh114-3-asi-drain-cocks-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52547,"registerId":"commonwealth-F2006B08940-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH114/3 - ASI Drain Cocks - 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/DH114/3 ASI Drain Cocks - Modification NK\n\nApplicability: All Series 1B and 2. Document: 1. DH Heron Mod. No. 342; or\n\n2. ANO 105.1.14.17.5.3.\n\n \n\nCompliance: Before 28 February 1955.\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":"The text of this directive imposes a modification requirement on all DH114 (Heron) Series 1B and 2 aircraft and specifies the acceptable modification documents and a compliance date. The provided excerpt gives no indication that the directive's scope has been altered from its original stated requirement; it continues to apply to the same aircraft series and to mandate the modification by the referenced documents (Applicability/Document/Compliance lines)."},"complexity_factors":["Narrow, clearly specified applicability (All DH114 Heron Series 1B and 2). (Applicability line)","Requires a concrete physical modification performed to external, referenced documents rather than prescribing technical detail in the directive itself (Document line)","Fixed historical compliance deadline creates a binary time constraint but no phased compliance or alternative timeline (Compliance line)","Directive text provides no enforcement or reporting details, increasing uncertainty about follow-up procedures and administrative burden (absence of such provisions in provided text)","Operational impact depends on maintenance logistics (downtime, parts, labour) even though those costs are not quantified in the text"],"plain_english_summary":"Owners and operators of DH114 (Heron) Series 1B and Series 2 aircraft must have ASI drain cocks physically modified in accordance with either DH Heron Mod. No. 342 or ANO 105.1.14.17.5.3. The modification is mandatory and must be completed before 28 February 1955, with costs, scheduling and downtime borne by the owner/operator. The directive sets the requirement and deadline but gives no rationale or enforcement details."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on ASI drain cock modifications for DH114 Heron aircraft. It has not expanded beyond its original technical safety purpose. The scope remains tightly constrained to the specific aircraft type and modification described."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined technical references (the modification documents)","No nested conditional logic or exceptions","Single, unambiguous compliance requirement with one deadline","No cross-referencing to other legislation beyond the enabling regulations (Civil Aviation Regulations 1998, Part 39)","Straightforward applicability clause (specific aircraft models only)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998. It applies to **DH114 (Heron) Series 1B and 2 aeroplanes** (a type of aircraft).\n\n**What it requires:**\n- Aircraft owners/operators must **modify the Air Speed Indicator (ASI) drain cocks** on these specific aircraft models.\n- The modification must follow either:\n  - **DH Heron Modification No. 342**, or\n  - **ANO 105.1.14.17.5.3** (an Air Navigation Order — essentially an official aviation safety instruction).\n\n**Who must comply:**\n- Anyone operating or maintaining DH114 Heron Series 1B or 2 aircraft.\n\n**Deadline:**\n- The modification had to be completed **before 28 February 1955**.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. They exist to fix known safety problems in aircraft. This particular directive addresses a specific technical issue with the drain cocks on air speed indicators — components that help ensure accurate speed readings, which are critical for safe flight. Non-compliance means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh114-3-asi-drain-cocks-modification","history":"/api/acts/ad-dh114-3-asi-drain-cocks-modification/history","analysis":"/api/acts/ad-dh114-3-asi-drain-cocks-modification/analysis","conflicts":"/api/acts/ad-dh114-3-asi-drain-cocks-modification/conflicts","importantCases":"/api/acts/ad-dh114-3-asi-drain-cocks-modification/important-cases","documents":"/api/acts/ad-dh114-3-asi-drain-cocks-modification/documents"}}