{"id":"F2006B02627","name":"AD/B727/104 - Main Landing Gear Lock System","slug":"ad-b727-104-main-landing-gear-lock-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41943,"registerId":"commonwealth-F2006B02627-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/104 - Main Landing Gear Lock System","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/B727/104 Main Landing Gear Lock System 9/88\n\nCANCELLED.\n\n \n\nBackground: Refer AD/B727/84 Amdt 3.\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\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a cancellation notice for a specific airworthiness directive. It has not expanded beyond its original purpose; rather, it has terminated that purpose. The scope has contracted to zero — it now serves only as a historical pointer to the current applicable directive (AD/B727/84 Amdt 3)."},"complexity_factors":["Document is only 4 substantive lines long","No defined terms section","No conditional logic or cross-references to other legislation (only a simple pointer to a related directive)","Content is purely administrative — a cancellation notice with a reference to the replacement directive","No operative provisions, penalties, or compliance requirements (since cancelled)"],"plain_english_summary":"This is a **cancelled airworthiness directive** for Boeing 727 aircraft.\n\n**What it was:** An official safety instruction (called an \"Airworthiness Directive\" or AD) that required owners and operators of Boeing 727 series aeroplanes to take specific action regarding the **main landing gear lock system** — the mechanism that keeps the plane's main wheels locked in place when retracted or extended.\n\n**What happened to it:** This directive has been **cancelled** (no longer in force). If you need to know what safety requirements currently apply, you should look at **AD/B727/84 Amendment 3** instead — that's the directive that replaced or superseded this one.\n\n**Who it affected:** Airlines, charter operators, and private owners of Boeing 727 aircraft registered in Australia.\n\n**Why it mattered:** Landing gear failures can be catastrophic. Airworthiness directives are legally binding safety orders issued by the Civil Aviation Safety Authority (CASA) to fix unsafe conditions in aircraft. When a directive is cancelled, it usually means the issue was resolved through a different directive, the aircraft were retired, or the safety requirement was incorporated into another rule."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"This entry cancels AD/B727/104 (Main Landing Gear Lock System), thereby removing the legal force of that specific directive. The document itself provides no detail about the original measures or whether their substance has been absorbed elsewhere; it only directs the reader to AD/B727/84 Amendment 3 for background. As a result, the scope of active requirements under AD/B727/104 is changed (terminated), but the exact extent of change relative to operational obligations requires consulting the referenced AD(s). (AD/B727/104; Background: Refer AD/B727/84 Amdt 3)"},"complexity_factors":["Document is extremely short and contains only a cancellation statement.","Cross-reference to another AD (AD/B727/84 Amdt 3) requires consulting external material to determine substantive effects.","Absence of operative detail about prior obligations or reasons for cancellation increases interpretive ambiguity.","Historical nature (cancellation) means regulatory effect is binary (active vs cancelled), reducing procedural complexity but increasing compliance‑tracking needs.","No schedules, compliance steps, or enforcement provisions are included in the text."],"plain_english_summary":"This instrument cancels Airworthiness Directive AD/B727/104 (Main Landing Gear Lock System) for Boeing 727 series aeroplanes. It contains no new compliance steps and directs readers to AD/B727/84 Amdt 3 for background.\n\nOperators, owners and maintenance organisations should note the legal obligation under AD/B727/104 is removed, but must check AD/B727/84 Amdt 3 and related ADs to determine any remaining or transferred requirements and avoid compliance gaps."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-104-main-landing-gear-lock-system","history":"/api/acts/ad-b727-104-main-landing-gear-lock-system/history","analysis":"/api/acts/ad-b727-104-main-landing-gear-lock-system/analysis","conflicts":"/api/acts/ad-b727-104-main-landing-gear-lock-system/conflicts","importantCases":"/api/acts/ad-b727-104-main-landing-gear-lock-system/important-cases","documents":"/api/acts/ad-b727-104-main-landing-gear-lock-system/documents"}}