{"id":"F2006B02704","name":"AD/B727/18 - Outboard Trailing Edge Foreflap Track Guide Block - Installation","slug":"ad-b727-18-outboard-trailing-edge-foreflap-track-guide-block-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42020,"registerId":"commonwealth-F2006B02704-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/18 - Outboard Trailing Edge Foreflap Track Guide Block - 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/B727/18 Outboard Trailing Edge Foreflap Track\n\nGuide Block - Installation\n\n\n6/67\n\n \n\nApplicability: All models. Document: Boeing SB No. 57-59. 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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to all Boeing 727 models and mandates installation of the outboard trailing edge foreflap track guide block per Boeing SB No. 57-59, with compliance required forthwith. The excerpt contains no indication that the scope has been altered from an earlier or original intent; it states applicability and requirement directly (\"Applicability: All models.\" \"Document: Boeing SB No. 57-59.\" \"Compliance: Forthwith.\")."},"complexity_factors":["Directive text is short and prescriptive: it requires a single listed action (installation of a specified part).","Applicability is broad but simple: \"All models\" (clear population but wide coverage).","Compliance timing is immediate (\"Forthwith\"), creating operational urgency despite simple technical scope.","Technical execution and precise procedures are delegated to an external Boeing Service Bulletin (SB No. 57-59), requiring operators to obtain and follow that document.","AD does not include procedural detail, tolerances or inspection criteria in the text provided, which shifts complexity into the external SB and maintenance processes."],"plain_english_summary":"This CASA airworthiness directive mandates immediate installation of an outboard trailing edge foreflap track guide block on all Boeing 727 series aeroplanes, requiring operators to follow Boeing Service Bulletin No. 57‑59. \n\nIt affects owners/operators who must procure parts, schedule maintenance and record compliance forthwith; costs, downtime and reliance on the Boeing SB for technical steps are borne by operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused on one specific mechanical component on one aircraft type. It represents the standard, narrow scope of individual ADs under Part 39 of the Civil Aviation Regulations."},"complexity_factors":["Extremely short document — approximately 100 words of substantive content","No defined terms section — all language is technical but self-explanatory to aviation professionals","No conditional logic or nested exceptions","Single compliance requirement with immediate effect","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Simple structure: applicability, reference document, compliance deadline"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:** It requires owners and operators of **Boeing 727 series aeroplanes** to install a specific part called an \"outboard trailing edge foreflap track guide block.\" This is a hardware component that helps guide the movement of the foreflap — a movable surface on the wing's trailing edge that helps with lift during takeoff and landing.\n\n**Who it affects:** Anyone who owns, operates, or maintains Boeing 727 aircraft in Australia.\n\n**Why it matters:** The directive references **Boeing Service Bulletin No. 57-59**, which typically means Boeing identified a safety issue — possibly wear, fatigue, or potential failure of the existing component — that could affect flight safety. The \"compliance: forthwith\" instruction means this must be done immediately, not on a future maintenance schedule.\n\n**Key details:**\n- **Applies to:** All Boeing 727 models\n- **Action required:** Install the specified guide block\n- **When:** Immediately (\"forthwith\")\n- **Source document:** Boeing Service Bulletin 57-59"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-18-outboard-trailing-edge-foreflap-track-guide-block-installation","history":"/api/acts/ad-b727-18-outboard-trailing-edge-foreflap-track-guide-block-installation/history","analysis":"/api/acts/ad-b727-18-outboard-trailing-edge-foreflap-track-guide-block-installation/analysis","conflicts":"/api/acts/ad-b727-18-outboard-trailing-edge-foreflap-track-guide-block-installation/conflicts","importantCases":"/api/acts/ad-b727-18-outboard-trailing-edge-foreflap-track-guide-block-installation/important-cases","documents":"/api/acts/ad-b727-18-outboard-trailing-edge-foreflap-track-guide-block-installation/documents"}}