{"id":"F2006B08811","name":"AD/DC3/4 Reissue - Engine Section Throttle Control Rod - Replacement","slug":"ad-dc3-4-reissue-engine-section-throttle-control-rod-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52194,"registerId":"commonwealth-F2006B08811-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DC3/4 Reissue - Engine Section Throttle Control Rod - 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 DC3 Series Aeroplanes\n\n \n\nAD/DC3/4\n\nReissue\n\n\nEngine Section Throttle Control Rod - Replacement\n\n\n1/84\n\n \n\nApplicability: DC3/C47 aircraft - All models fitted with Pratt and Whitney engines. Document: Douglas SB (DC3) No. 219 Section V; or\n\n*  CAA (US) AD 44-7-3; or\n\n \n\n* ANO 105.1.16.1.5.4.\n\n \n\n*  Included for reference purposes as these documents are no longer a requirement.\n\n \n\nCompliance: Before the issue of a Certificate of Airworthiness.\n\n \n\nBackground:  This Directive is re-issued to cover aircraft that are to be added the Register and aircraft requiring Certificate of Airworthiness renewal.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":true,"description":"The re-issue explicitly extends the directive's coverage to aircraft that are to be added to the Register and to aircraft requiring renewal of a Certificate of Airworthiness. The Background states this as the reason for re-issuing the directive, indicating an expansion of the cohort of aircraft to which the replacement requirement applies. (See: \"Background\")."},"complexity_factors":["Narrow technical scope: single specified action (replacement of the throttle control rod) applies to a specific aircraft type and engine fitment (DC3/C47 with Pratt & Whitney engines). (See: \"Applicability\"; title).","Timing requirement: compliance is tied to a regulatory milestone (before Certificate of Airworthiness issuance), which makes the timing critical but procedurally simple. (See: \"Compliance\").","Minimal procedural detail: the directive does not reproduce technical procedures, increasing reliance on external documents or the certifying authority for implementation details. (See: \"Document\").","Reference material listed but non-mandatory: the directive lists three documents for reference and explicitly states they are no longer mandatory requirements, which reduces prescriptive complexity but requires users to seek guidance on acceptable methods. (See: \"Document\").","Re-issued scope: the directive explicitly extends coverage to aircraft being added to the Register and to those requiring CoA renewal, altering the set of affected aircraft compared with a narrower original issuance. (See: \"Background\")."],"plain_english_summary":"What this instrument does, mechanically\n\n- Requires replacement of the engine-section throttle control rod on Douglas DC3/C47 aeroplanes fitted with Pratt & Whitney engines before a Certificate of Airworthiness (CoA) is issued. (See: \"Engine Section Throttle Control Rod - Replacement\" title; \"Applicability\"; \"Compliance\").\n\nWho it affects\n\n- Aircraft owners and operators of DC3/C47 aircraft with Pratt & Whitney engines that are to be added to the Australian Register or that require renewal of a Certificate of Airworthiness. (See: \"Applicability\"; \"Background\").\n\nOfficial rationale and the change in scope\n\n- The directive is a re-issue intended to cover aircraft being added to the Register and aircraft requiring CoA renewal. That purpose is stated in the directive's Background. (See: \"Background\").\n\nCompliance mechanism and procedural scope\n\n- Compliance is required before issuance of a Certificate of Airworthiness. (See: \"Compliance\").\n- The directive lists three documents (Douglas SB (DC3) No. 219 Section V; CAA (US) AD 44-7-3; ANO 105.1.16.1.5.4) as references. The directive states those documents are included for reference and are no longer mandatory requirements. (See: \"Document\" and the note: \"Included for reference purposes as these documents are no longer a requirement.\").\n- The directive does not reproduce detailed technical procedures. Applicants should refer to the listed documents or the certifying authority for technical guidance on acceptable means of compliance. (See: \"Document\" and \"Compliance\").\n\nWho pays, who decides, and what behaviour changes\n\n- Who pays: Owners/operators seeking initial registration or CoA renewal are responsible for ensuring the replacement is done before CoA issuance (the directive sets the timing). (See: \"Compliance\").\n- Who decides: The Civil Aviation Safety Authority enforces the requirement by conditioning Certificate of Airworthiness issuance on compliance. The owner/operator or their contracted maintenance provider decides how and by whom the replacement is carried out, consistent with any technical guidance relied on. (See: \"Compliance\"; \"Document\".)\n- Behaviour changes: Affected owners/operators must arrange for the replacement work and any associated inspections or paperwork before they can obtain a CoA. This will influence maintenance scheduling, parts procurement, and interactions with certificating authorities and maintenance providers. (See: \"Compliance\"; \"Document\").\n\nTrade-offs, incentives and market effects (mechanisms, not judgments)\n\n- Direct cost and time: Requiring replacement before CoA issuance imposes a timing constraint that will create direct costs (parts, labour, downtime) for owners/operators prior to certification. The directive text establishes the timing but does not quantify cost. (See: \"Compliance\").\n- Incentives for service providers and parts suppliers: The requirement creates demand for parts and maintenance services at the point of initial registration or renewal. That demand accrues to whichever maintenance providers and parts suppliers owners select. (See: \"Compliance\" and \"Applicability\").\n- Contract and operation effects: Operators will need to schedule the replacement into their pre-certification workstreams and allocate funds and contractual arrangements to complete the work prior to CoA issuance. The directive sets the timing but does not specify methods. (See: \"Compliance\" and \"Document\").\n- Regulatory discretion and procedural dependence: The directive conditions CoA issuance on compliance and refers applicants to listed documents or the certifying authority for guidance. The text therefore places a procedural reliance on the certificating process and on external technical material that is provided as reference rather than a mandatory method. (See: \"Compliance\"; \"Document\").\n\nImplementation notes (procedural clarity)\n\n- The directive requires the replacement to be done before a Certificate of Airworthiness will be issued. (See: \"Compliance\").\n- The directive lists background and reference documents that are included for reference purposes and are no longer mandatory requirements; it does not reproduce step-by-step procedures. Applicants should refer to the listed documents or to the certifying authority for technical guidance and acceptable means of compliance. (See: \"Document\" and \"Background\")."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a straightforward reissue of an existing airworthiness directive. The scope remains limited to the specific technical requirement (throttle control rod replacement) for the specified aircraft type. The reissue simply extends coverage to newly registered aircraft and those undergoing certificate renewal, which is consistent with the original safety purpose."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 substantive requirement (replace throttle control rod)","No defined terms section","No cross-references to other legislation beyond historical reference documents","Single, clear compliance trigger (Certificate of Airworthiness issue/renewal)","No conditional logic or nested exceptions"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) for **Douglas DC-3/C-47 aircraft** powered by Pratt & Whitney engines.\n\n**What it requires:**\n- The **throttle control rod** in the engine section must be **replaced** before the aircraft can receive or renew its **Certificate of Airworthiness** (the official document that says a plane is safe to fly).\n\n**Why it matters:**\n- This directive was reissued to ensure that **newly registered aircraft** and those **renewing their airworthiness certificates** meet this safety standard. The throttle control rod is a critical component—if it fails, the pilot could lose control of engine power.\n\n**Key details:**\n- **Applies to:** All DC-3/C-47 models with Pratt & Whitney engines\n- **Based on:** Douglas Service Bulletin No. 219 and older US aviation safety orders\n- **When to comply:** Before getting or renewing a Certificate of Airworthiness\n\nThis is essentially a maintenance safety rule to keep these classic aircraft airworthy."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dc3-4-reissue-engine-section-throttle-control-rod-replacement","history":"/api/acts/ad-dc3-4-reissue-engine-section-throttle-control-rod-replacement/history","analysis":"/api/acts/ad-dc3-4-reissue-engine-section-throttle-control-rod-replacement/analysis","conflicts":"/api/acts/ad-dc3-4-reissue-engine-section-throttle-control-rod-replacement/conflicts","importantCases":"/api/acts/ad-dc3-4-reissue-engine-section-throttle-control-rod-replacement/important-cases","documents":"/api/acts/ad-dc3-4-reissue-engine-section-throttle-control-rod-replacement/documents"}}