{"id":"F2006B09775","name":"AD/F28/37 - Cargo Door Lock Warning Switch Actuating Mechanism - Modification","slug":"ad-f28-37-cargo-door-lock-warning-switch-actuating-mechanism-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54679,"registerId":"commonwealth-F2006B09775-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/37 - Cargo Door Lock Warning Switch Actuating Mechanism - 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)  Fokker F28 Series Aeroplanes\n\n \n\nAD/F28/37  Cargo Door Lock Warning Switch Actuating Mechanism - Modification\n\n\n5/78\n\n \n\nApplicability: All models with S/Nos. 11003 to 11112, 11115, 11116, 11120 and 11991 to 11993. Document:               1. Fokker SB No. F28/52-80; or\n\n2. RLD Directive 78-13-52. Compliance: Before 1 August 1978.\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":2,"scope_assessment":{"changed":false,"description":"The source text specifies a limited, explicit scope: a single modification required for Fokker F28 aeroplanes with the serial numbers listed and a firm compliance date. The document contains no language indicating that the scope has been expanded or altered from its stated requirements. (See Applicability and Compliance.)"},"complexity_factors":["Narrow applicability limited to specific serial numbers (Applicability: \"All models with S/Nos. 11003 to 11112, 11115, 11116, 11120 and 11991 to 11993.\"), which reduces legal and administrative complexity.","Single mandated action: a modification to a named component (AD title: \"Cargo Door Lock Warning Switch Actuating Mechanism - Modification\"), lowering procedural complexity relative to multi-part measures.","Fixed and short compliance deadline (Compliance: \"Before 1 August 1978.\"), which creates scheduling pressure but simplifies legal interpretation of the timeframe.","Dependence on external technical documents for implementation (Document: \"Fokker SB No. F28/52-80; or RLD Directive 78-13-52.\"), introducing a technical compliance layer that requires specialist maintenance knowledge.","Regulatory enforcement implied by Airworthiness Directive format and Civil Aviation Safety Authority heading, meaning formal monitoring and proof of compliance are required (header: \"CIVIL AVIATION SAFETY AUTHORITY\")."],"plain_english_summary":"This Airworthiness Directive mandates a modification to the cargo door lock warning switch actuating mechanism on specified Fokker F28 aeroplanes (listed serial numbers). Operators must implement the change using Fokker Service Bulletin F28/52-80 or RLD Directive 78-13-52 and complete it by 1 August 1978. Compliance is mandatory under the Civil Aviation Safety Authority framework, with costs, downtime and scheduling borne by the affected aircraft owners/operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive. Airworthiness Directives are inherently narrow in scope—each addresses a specific technical defect on specific aircraft models. There is no evidence of scope creep; the document precisely targets one mechanical system on defined aircraft serial numbers."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined technical references (the Fokker Service Bulletin and RLD Directive)","Simple applicability test (serial number ranges)","Single unconditional requirement with fixed deadline","No nested conditions, exceptions, or cross-references to other legislation","Straightforward binary compliance path (follow Document 1 OR Document 2)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for specific Fokker F28 aircraft. It mandates a safety modification to the cargo door lock warning system.\n\n**What it does:**\n- Requires owners/operators to modify the **actuating mechanism** (the moving parts that trigger the warning) for the cargo door lock warning switch\n- This ensures pilots get proper warnings if the cargo door isn't properly locked\n\n**Who it affects:**\n- Owners and operators of Fokker F28 series aircraft with specific serial numbers: 11003-11112, 11115, 11116, 11120, and 11991-11993\n\n**Why it matters:**\n- Cargo doors that appear locked but aren't properly secured can open in flight, causing rapid decompression or loss of cargo\n- The warning system tells pilots if there's a problem before takeoff\n- This AD had a **hard deadline** (before 1 August 1978), meaning non-compliance would ground the aircraft\n\n**How to comply:**\n- Follow either Fokker Service Bulletin F28/52-80 OR Dutch aviation authority directive RLD 78-13-52"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-37-cargo-door-lock-warning-switch-actuating-mechanism-modification","history":"/api/acts/ad-f28-37-cargo-door-lock-warning-switch-actuating-mechanism-modification/history","analysis":"/api/acts/ad-f28-37-cargo-door-lock-warning-switch-actuating-mechanism-modification/analysis","conflicts":"/api/acts/ad-f28-37-cargo-door-lock-warning-switch-actuating-mechanism-modification/conflicts","importantCases":"/api/acts/ad-f28-37-cargo-door-lock-warning-switch-actuating-mechanism-modification/important-cases","documents":"/api/acts/ad-f28-37-cargo-door-lock-warning-switch-actuating-mechanism-modification/documents"}}