{"id":"F2006B02761","name":"AD/B727/59 Amdt 1 - Main Landing Gear Down Lock Torque Tubes - Inspection and Modification","slug":"ad-b727-59-amdt-1-main-landing-gear-down-lock-torque-tubes-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42103,"registerId":"commonwealth-F2006B02761-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/59 Amdt 1 - Main Landing Gear Down Lock Torque Tubes - 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/B727/59\n\nAmdt 1\n\nApplicability: All models.\n\n\nMain Landing Gear Down Lock Torque Tubes - Inspection and Modification\n\n\n12/68\n\n \n\nDocument: Boeing SB No. 32-160, 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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical component on a specific aircraft type. It has not expanded beyond its original purpose of ensuring main landing gear integrity on Boeing 727 aircraft."},"complexity_factors":["Extremely short document (approximately 150 words)","Only one defined term implicitly referenced (Boeing SB No. 32-160)","No conditional logic or nested exceptions","Single, unambiguous compliance requirement","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Straightforward applicability statement ('All models')","Binary compliance status (comply forthwith or ground aircraft)"],"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**.\n\n**What it requires:**\n- **Inspection and modification** of the **main landing gear down lock torque tubes** — these are mechanical components that help lock the main wheels in the 'down' position for landing.\n\n**Why it matters:**\n- If these torque tubes fail, the landing gear might not lock properly when extended. This could cause the gear to collapse during landing, with potentially catastrophic consequences.\n\n**What operators must do:**\n- Follow **Boeing Service Bulletin No. 32-160, Revision 1** — this is the manufacturer's official repair/inspection instructions.\n- **Compliance deadline:** \"Forthwith\" — meaning immediately, without delay.\n\n**Who is affected:**\n- Airlines, cargo operators, or any entity operating Boeing 727 aircraft in Australia.\n\n**In short:** This is an urgent safety fix for a specific mechanical defect in Boeing 727 landing gear. Operators must inspect and modify their aircraft immediately using the manufacturer's specified procedure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied text is Amendment 1 of AD/B727/59 but does not include the original AD text or any comparison showing a change in scope. Based solely on the supplied document, the AD applies to all Boeing 727 models and requires immediate compliance with Boeing SB No. 32-160, Rev. 1; the supplied material does not demonstrate a change from the original intent or prior scope."},"complexity_factors":["Short, procedural AD referencing an external manufacturer service bulletin rather than setting technical detail in the AD itself (adds a dependence on the Boeing SB).","Immediate compliance timing (\"Forthwith\") which creates operational scheduling pressure.","Broad applicability (\"All models\") — affects entire fleet of Boeing 727 series, increasing aggregate operational impact.","Technical nature of the required work (landing gear torque-tube inspection/modification) requires specialist maintenance capability and parts.","Lack of detail in the AD text about inspection criteria, modification steps, or acceptable alternatives — operators must consult the Boeing SB to determine exact tasks and acceptance standards."],"plain_english_summary":"This AD mandates immediate inspection and modification of the main landing‑gear down‑lock torque tubes on all Boeing 727 models, requiring operators to follow Boeing Service Bulletin No. 32‑160, Rev. 1.  \n\nIt affects all owners/operators and their maintenance providers, who must fund parts, labour and downtime; technical details and execution are delegated to the Boeing service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-59-amdt-1-main-landing-gear-down-lock-torque-tubes-inspection-and-modification","history":"/api/acts/ad-b727-59-amdt-1-main-landing-gear-down-lock-torque-tubes-inspection-and-modification/history","analysis":"/api/acts/ad-b727-59-amdt-1-main-landing-gear-down-lock-torque-tubes-inspection-and-modification/analysis","conflicts":"/api/acts/ad-b727-59-amdt-1-main-landing-gear-down-lock-torque-tubes-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-b727-59-amdt-1-main-landing-gear-down-lock-torque-tubes-inspection-and-modification/important-cases","documents":"/api/acts/ad-b727-59-amdt-1-main-landing-gear-down-lock-torque-tubes-inspection-and-modification/documents"}}