{"id":"F2006B02773","name":"AD/B727/70 - Main Landing Gear Down-Lock Torque Shaft P/N 65-23366 - Replacement","slug":"ad-b727-70-main-landing-gear-down-lock-torque-shaft-p-n-65-23366-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42115,"registerId":"commonwealth-F2006B02773-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/70 - Main Landing Gear Down-Lock Torque Shaft P/N 65-23366 - Replacement","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/B727/70 Main Landing Gear Down-Lock Torque Shaft\n\nP/N 65-23366 - Replacement\n\n\n10/75\n\n \n\nApplicability: All models listed in Boeing SB No. 32-180 Rev. 1. with main landing gear down-lock torque shaft P/No. 65-23366.\n\n \n\nDocument: FAA AD 72-12-01, Boeing Amdt. 39-2353. Compliance:  As detailed in the requirement document.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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 focused on a single mechanical component. It has not expanded beyond its original purpose of mandating replacement of a specific defective part in Boeing 727 landing gear systems."},"complexity_factors":["Very short document — essentially a single paragraph of operative text","Only one defined applicability criterion (Boeing SB No. 32-180 Rev. 1 with specific part number)","No conditional logic or nested exceptions — straightforward mandatory replacement","Cross-references to external documents (FAA AD and Boeing Service Bulletin) but does not reproduce their content","No interpretation section or defined terms within the instrument itself"],"plain_english_summary":"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:**\nIt requires owners and operators of **Boeing 727 series aircraft** to replace a specific part in the main landing gear — the \"down-lock torque shaft\" with part number 65-23366.\n\n**Why it matters:**\nThe down-lock torque shaft is a critical component that helps lock the main landing gear in the \"down\" position during landing. If this part fails, the landing gear could collapse on landing, with potentially catastrophic consequences. This AD mandates replacement to prevent mechanical failure.\n\n**Who it affects:**\n- Airlines and operators flying Boeing 727 aircraft\n- Maintenance organisations servicing these aircraft\n- The specific part applies to all Boeing 727 models covered by Boeing Service Bulletin 32-180 Revision 1\n\n**What must be done:**\nOperators must follow the detailed instructions in the referenced FAA AD 72-12-01 and Boeing Amendment 39-2353 to replace the faulty torque shaft. The directive was originally issued in October 1975 (hence \"10/75\")."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD text itself defines its scope narrowly: it applies to Boeing 727 models listed in Boeing SB No. 32-180 Rev. 1 that have main landing gear down-lock torque shaft P/N 65-23366 and mandates replacement as specified in the referenced FAA/Boeing documents (Applicability; Document; Compliance). The instrument does not indicate any amendment or expansion of scope from an earlier statement within this text, nor does it state a different original scope; based on the AD text alone there is no evidence the scope has changed."},"complexity_factors":["External dependency: the AD refers to an external FAA Airworthiness Directive and a Boeing Service Bulletin for the detailed technical and compliance steps (Document).","Limited on-face detail: the AD text specifies the action (replacement) and applicability but does not include procedures, intervals, or acceptance criteria (Compliance).","Applicability is model-specific and tied to a service bulletin list, requiring cross-reference to determine which airframes are affected (Applicability).","Operational logistics: replacement requires parts, maintenance access and scheduling, which vary by operator and are not described in the AD (Applicability; Compliance)."],"plain_english_summary":"This AD requires replacement of the main landing‑gear down‑lock torque shaft (P/N 65‑23366) on specified Boeing 727s, and delegates the detailed procedure and timing to FAA AD 72‑12‑01 and Boeing SB No. 32‑180 Rev. 1.\n\nIt affects operators, maintenance organisations and parts suppliers—operators pay for parts, labour and downtime and must schedule the work, while reliance on the FAA/Boeing documents and parts availability are the main implementation risks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-70-main-landing-gear-down-lock-torque-shaft-p-n-65-23366-replacement","history":"/api/acts/ad-b727-70-main-landing-gear-down-lock-torque-shaft-p-n-65-23366-replacement/history","analysis":"/api/acts/ad-b727-70-main-landing-gear-down-lock-torque-shaft-p-n-65-23366-replacement/analysis","conflicts":"/api/acts/ad-b727-70-main-landing-gear-down-lock-torque-shaft-p-n-65-23366-replacement/conflicts","importantCases":"/api/acts/ad-b727-70-main-landing-gear-down-lock-torque-shaft-p-n-65-23366-replacement/important-cases","documents":"/api/acts/ad-b727-70-main-landing-gear-down-lock-torque-shaft-p-n-65-23366-replacement/documents"}}