{"id":"F2006B02789","name":"AD/B727/85 - Main Landing Gear Side Strut","slug":"ad-b727-85-main-landing-gear-side-strut","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42131,"registerId":"commonwealth-F2006B02789-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/85 - Main Landing Gear Side Strut","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/B727/85 Main Landing Gear Side Strut 1/80\n\nApplicability: All model 727 with line numbers 1 to 1361 inclusive. Document: 1. FAA AD 79-20-06, Amdt. 39-3581; or\n\n2. Boeing SB No. 727-32-268, Rev. 1.\n\n \n\nCompliance: As per requirement document No. 1.\n\n \n\nBackground:  Incorrect parts may have been installed in the M-L-G side strut assemblies at manufacture.\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":4,"scope_assessment":{"changed":false,"description":"The AD’s scope, as set out in the text supplied, is focused and specific: it applies to Boeing 727 aircraft with line numbers 1–1361 and requires compliance with FAA AD 79-20-06 (Applicability; Compliance). The stated purpose (incorrect parts may have been installed in the M‑L‑G side strut assemblies) matches the scope targeted at those airframes (Background). Nothing in the supplied text expands or narrows that scope beyond addressing that manufacturing issue and directing operators to the referenced requirement document."},"complexity_factors":["Delegates substantive technical requirements to an external document (FAA AD 79-20-06) rather than containing them in-line (Compliance).","Cross-reference to manufacturer service bulletin as related guidance creates a two‑document compliance path (Document No. 2).","Applicability limited by aircraft line numbers requires verifying serial/line identity (Applicability).","Absence of cost, enforcement, and scheduling details in the AD excerpt increases implementation uncertainty.","Potential need for cross-jurisdictional interpretation because the operative requirement is an FAA AD cited by an Australian AD (Document No. 1)."],"plain_english_summary":"This Airworthiness Directive applies to Boeing 727s (line numbers 1–1361) and, because incorrect parts may have been fitted in main‑landing‑gear side strut assemblies, mandates compliance with FAA AD 79‑20‑06 as the operative technical requirement. Affected operators must obtain and follow that FAA AD (and the cited Boeing service bulletin) for the specific inspections and corrective actions; the AD itself delegates technical detail rather than reproducing it."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of addressing the landing gear side strut manufacturing defect."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section — relies entirely on external technical documents","Simple conditional structure: applicability rule (line numbers 1-1361) + compliance reference","No nested exceptions or cross-references to other legislation","Single operational requirement: follow the FAA AD or Boeing Service Bulletin","Background explanation is one sentence"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or inspections on aircraft.\n\n**What it does:** It orders owners and operators of certain Boeing 727 aeroplanes to check and fix a problem with the **main landing gear side strut** (a structural component that helps support the aircraft's weight on the ground). The concern is that **wrong parts may have been installed during manufacturing**, which could weaken the landing gear.\n\n**Who it affects:** Anyone who owns or operates Boeing 727 aircraft with **line numbers 1 to 1361** (essentially the early production models of this aircraft type).\n\n**What must be done:** Operators must follow the instructions in **FAA Airworthiness Directive 79-20-06** or **Boeing Service Bulletin 727-32-268** (technical documents that spell out exactly what inspections or replacements are needed).\n\n**Why it matters:** Landing gear failure during takeoff or landing could be catastrophic. This directive ensures potentially defective components are identified and corrected before they cause an accident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-85-main-landing-gear-side-strut","history":"/api/acts/ad-b727-85-main-landing-gear-side-strut/history","analysis":"/api/acts/ad-b727-85-main-landing-gear-side-strut/analysis","conflicts":"/api/acts/ad-b727-85-main-landing-gear-side-strut/conflicts","importantCases":"/api/acts/ad-b727-85-main-landing-gear-side-strut/important-cases","documents":"/api/acts/ad-b727-85-main-landing-gear-side-strut/documents"}}