{"id":"F2006B02741","name":"AD/B727/40 - Cargo Door Mechanism Protective Cover - Installation","slug":"ad-b727-40-cargo-door-mechanism-protective-cover-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42083,"registerId":"commonwealth-F2006B02741-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/40 - Cargo Door Mechanism Protective Cover - Installation","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)  Boeing 727 Series Aeroplanes\n\n \n\nAD/B727/40  Cargo Door Mechanism Protective Cover - Installation\n\n\n4/67\n\n \n\nApplicability: All models. Document: Boeing SB No. 52-34. Compliance: Forthwith.\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 discrete, targeted safety directive. It has not expanded beyond its original purpose of mandating a specific physical modification to address a known safety issue with cargo door mechanisms."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","No defined terms section","No cross-references to other legislation beyond a single Boeing technical document reference","Simple unconditional mandate: install the cover, do it now","Single applicability criterion ('All models') with no exceptions or conditional logic","Minimal regulatory machinery — essentially a direct command with citation authority"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of **Boeing 727 aircraft** to install a protective cover over the cargo door mechanism.\n\n**What it does:**\n- Mandates a specific safety modification to prevent potential failures of the cargo door system\n- References Boeing Service Bulletin 52-34 as the technical standard for how to do the work\n\n**Who it affects:**\n- All operators of Boeing 727 series aircraft in Australia\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nCargo door failures can have catastrophic consequences (including explosive decompression). This directive ensures a known vulnerability is addressed immediately across the entire Australian fleet of this aircraft type.\n\n**Key requirement:** \"Forthwith\" means **immediately** — there is no grace period for compliance."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The provided AD text sets applicability as \"All models,\" references Boeing Service Bulletin No. 52-34, and mandates compliance \"Forthwith.\" The text contains no language indicating a change in scope from an earlier instrument or a narrowing/broadening of coverage; therefore no change in scope is indicated within the supplied material."},"complexity_factors":["Short, narrowly framed directive with a single mandated action (installation of protective cover). (Title; Document: Boeing SB No. 52-34)","Immediate compliance timing labelled \"Forthwith\" increases operational urgency but does not add procedural steps. (Compliance: Forthwith)","Reliance on an external technical document (Boeing SB No. 52-34) for implementation details introduces dependency on that bulletin for parts and procedure, rather than embedding technical complexity in the AD text. (Document: Boeing SB No. 52-34)","No alternatives, deferments or exemptions specified in the provided text, reducing interpretive complexity but increasing compliance certainty. (Compliance: Forthwith)","Applicability set to all models simplifies scope determination but broadens the number of affected operators. (Applicability: All models)"],"plain_english_summary":"This airworthiness directive mandates immediate installation of a protective cover on the cargo‑door mechanism of all Boeing 727 series aeroplanes, to be carried out per Boeing Service Bulletin No. 52‑34. It affects owners/operators, who must fund and schedule the work “forthwith” (no alternatives or deferments specified), potentially causing downtime and maintenance rescheduling to achieve mandatory compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-40-cargo-door-mechanism-protective-cover-installation","history":"/api/acts/ad-b727-40-cargo-door-mechanism-protective-cover-installation/history","analysis":"/api/acts/ad-b727-40-cargo-door-mechanism-protective-cover-installation/analysis","conflicts":"/api/acts/ad-b727-40-cargo-door-mechanism-protective-cover-installation/conflicts","importantCases":"/api/acts/ad-b727-40-cargo-door-mechanism-protective-cover-installation/important-cases","documents":"/api/acts/ad-b727-40-cargo-door-mechanism-protective-cover-installation/documents"}}