{"id":"F2006B08843","name":"AD/DC4/36 - Nose Gear Yoke End Fitting - Inspection and Replacement","slug":"ad-dc4-36-nose-gear-yoke-end-fitting-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52322,"registerId":"commonwealth-F2006B08843-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DC4/36 - Nose Gear Yoke End Fitting - Inspection and Replacement","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)  Douglas DC4 Series Aeroplanes\n\n \n\nAD/DC4/36 Nose Gear Yoke End Fitting - Inspection NK\n\nand Replacement\n\n \n\nDocument: 1. Douglas SL A-214-T.51/WBM, dated 7 January 1948, A-214 TS 2249/WBM, dated 25 November 1947 and A-214 TS1572/WBM, dated 20 October 1947; or\n\n \n\n2. FAA AD 49-27-3; or\n\n \n\n3. ANO 105.1.16.2.6.5.\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 narrow, technical safety directive focused on a specific mechanical component of a specific aircraft type. It has not expanded beyond its original purpose of ensuring the airworthiness of DC-4 nose gear assemblies."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 substantive operative requirement (inspect and replace)","3 external document references but no internal defined terms","No conditional logic, exceptions, or nested provisions","Single aircraft type applicability (Douglas DC-4 series)","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for **Douglas DC-4 series aircraft**.\n\n**What it does:**\n- Requires owners and operators to **inspect and replace** a specific part called the **\"nose gear yoke end fitting\"** — a component in the aircraft's front landing gear.\n- The directive references three technical documents that specify exactly how to perform the inspection and replacement:\n  1. Douglas Service Letters from 1947-1948\n  2. An equivalent US Federal Aviation Administration (FAA) directive (AD 49-27-3)\n  3. An old Australian National Order (ANO 105.1.16.2.6.5)\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains Douglas DC-4 aircraft in Australia.\n\n**Why it matters:**\n- Airworthiness Directives are **legally binding safety orders**. If you don't comply, your aircraft cannot legally fly.\n- This particular AD addresses a potential safety issue with the nose landing gear — failure of this component during takeoff or landing could be catastrophic.\n- The \"NK\" marking indicates this is a **non-kit** directive, meaning operators must source their own parts rather than receiving a kit from the manufacturer."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The provided AD text sets a requirement for inspection and replacement of the DC-4 nose-gear yoke end fitting and points to three external documents for the procedures. The AD text supplied does not indicate any expansion or reduction in scope relative to prior instruments; it simply establishes the inspection/replacement obligation and references the sources that contain the detailed criteria."},"complexity_factors":["Reliance on multiple external documents (three Douglas service letters, an FAA AD, and an ANO) for procedural detail","The AD text does not include inspection intervals, acceptance/rejection criteria or step-by-step procedures; those details reside in the referenced sources","Cross-jurisdictional reference (an FAA AD) requires operators to interpret foreign-origin material alongside Australian requirements","Vintage nature of the referenced Douglas documents (dated 1947–1948) can complicate locating originals and interpreting older maintenance practices","Regulatory binding effect under Part 39 means operational and commercial consequences for non-compliance","Aircraft-specific applicability (Douglas DC-4 series) concentrates the impact on a small, specialised operator base","Potential supply and logistics considerations for replacement fittings given the age of the type and parts availability"],"plain_english_summary":"This AD (AD/DC4/36) mandates inspection and, if necessary, replacement of the nose‑gear yoke end fitting on Douglas DC‑4 series aircraft as a condition of continued airworthiness under Part 39. It affects owners/operators, who must follow one of the referenced service letters/FAA AD/ANO for procedures and bear inspection and repair costs. CASA issues the requirement; specific intervals and acceptance criteria are contained in the external documents named in the AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dc4-36-nose-gear-yoke-end-fitting-inspection-and-replacement","history":"/api/acts/ad-dc4-36-nose-gear-yoke-end-fitting-inspection-and-replacement/history","analysis":"/api/acts/ad-dc4-36-nose-gear-yoke-end-fitting-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-dc4-36-nose-gear-yoke-end-fitting-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-dc4-36-nose-gear-yoke-end-fitting-inspection-and-replacement/important-cases","documents":"/api/acts/ad-dc4-36-nose-gear-yoke-end-fitting-inspection-and-replacement/documents"}}