{"id":"F2006B02727","name":"AD/B727/27 - Main Landing Gear Actuator Beam - Inspection and Modification","slug":"ad-b727-27-main-landing-gear-actuator-beam-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42043,"registerId":"commonwealth-F2006B02727-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/27 - Main Landing Gear Actuator Beam - Inspection and 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)  Boeing 727 Series Aeroplanes\n\n \n\nAD/B727/27 Main Landing Gear Actuator Beam - Inspection\n\nand Modification\n\n\n6/66\n\n \n\nApplicability: All models.\n\n \n\nDocument: Boeing SB No. 32-46, Rev. 1. 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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The excerpt shows a standalone airworthiness directive applying to all Boeing 727 models and directing compliance with Boeing SB No. 32-46 Rev. 1 forthwith. There is no indication in this text that the scope of affected aircraft or required actions has been changed from the directive's original framing in this excerpt (Applicability: All models; Document: Boeing SB No. 32-46, Rev. 1; Compliance: Forthwith)."},"complexity_factors":["Immediate compliance requirement (Compliance: Forthwith) increases short-term operational complexity.","Applicability covers all Boeing 727 models, so the universe of affected operators is broad (Applicability: All models).","Technical steps and specifics are delegated to an external document (Boeing SB No. 32-46, Rev. 1), creating dependency on that bulletin for detailed implementation (Document: Boeing SB No. 32-46, Rev. 1).","Potential for logistical complexity (parts, skilled labour, scheduling) despite the AD text being short.","Regulatory enforcement is binary (must comply); the AD text offers little operational discretion (Compliance: Forthwith)."],"plain_english_summary":"This AD mandates immediate inspection and modification of the main landing-gear actuator beam on all Boeing 727 series aeroplanes, to be done per Boeing Service Bulletin No. 32-46 Rev. 1. It affects owners, operators and maintenance organisations, who must bear the costs and schedule the work forthwith; CASA enforces the mandatory compliance."},"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 — they address specific technical defects in specific aircraft types. There is no indication of scope creep; the instrument does exactly what its title suggests and nothing more."},"complexity_factors":["Extremely short document — approximately 150 words","No defined terms section — uses plain operational language","Single, unambiguous compliance requirement ('Forthwith')","No nested exceptions or conditional logic","Single cross-reference to external Boeing document (SB 32-46)","No internal cross-references within the instrument itself","Clear applicability statement ('All models') with no exclusions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to **all Boeing 727 aircraft** operating in Australia.\n\n**What it requires:**\n- **Inspection and modification** of the **main landing gear actuator beam** — a critical structural component that helps operate the aircraft's main wheels.\n- **Compliance:** \"Forthwith\" means immediately — operators must do this right away, not on their next scheduled maintenance.\n\n**Why it matters:**\nThe actuator beam is essential for safe landing gear operation. This directive likely addresses a discovered defect or failure mode that could compromise flight safety. The reference to **Boeing Service Bulletin 32-46, Revision 1** indicates this follows the manufacturer's official repair instructions.\n\n**Who must comply:**\n- Owners and operators of all Boeing 727 models\n- Maintenance organisations servicing these aircraft\n\nFailure to comply grounds the aircraft — it cannot legally fly in Australian airspace."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-27-main-landing-gear-actuator-beam-inspection-and-modification","history":"/api/acts/ad-b727-27-main-landing-gear-actuator-beam-inspection-and-modification/history","analysis":"/api/acts/ad-b727-27-main-landing-gear-actuator-beam-inspection-and-modification/analysis","conflicts":"/api/acts/ad-b727-27-main-landing-gear-actuator-beam-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-b727-27-main-landing-gear-actuator-beam-inspection-and-modification/important-cases","documents":"/api/acts/ad-b727-27-main-landing-gear-actuator-beam-inspection-and-modification/documents"}}