{"id":"F2006B02771","name":"AD/B727/68 - Main Landing Gear Aft Trunnion - Inspection and Rework","slug":"ad-b727-68-main-landing-gear-aft-trunnion-inspection-and-rework","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42113,"registerId":"commonwealth-F2006B02771-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/68 - Main Landing Gear Aft Trunnion - Inspection and Rework","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/B727/68 Main Landing Gear Aft Trunnion - Inspection\n\nand Rework\n\n\n7/75\n\n \n\nApplicability: All models.\n\n \n\nDocument: Boeing SB No. 727-32-230. Compliance: Before 31 July 1975.\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, time-bound safety directive with a narrow technical scope focused on a specific aircraft component. It has not expanded beyond its original purpose of mandating inspection and rework of the Boeing 727 main landing gear aft trunnion."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined elements: applicability (all models) and compliance deadline","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","No conditional logic or nested exceptions — straightforward mandatory requirement","Single operational requirement with clear external reference to Boeing technical documentation","No interpretative provisions or definitions section"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nThis directive requires owners and operators of **Boeing 727 aircraft** to inspect and potentially repair a specific part of the main landing gear called the \"aft trunnion\" (a structural mounting point that connects the landing gear to the aircraft body).\n\n**Who it affects:**\n- All operators of Boeing 727 series aircraft in Australia\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nThe aft trunnion is critical to the structural integrity of the landing gear. Failure of this component during landing could cause catastrophic damage to the aircraft and endanger lives. This directive mandates a specific safety inspection and any necessary repairs based on Boeing's Service Bulletin 727-32-230.\n\n**Key requirements:**\n- **Compliance deadline:** Before 31 July 1975\n- **Reference document:** Boeing Service Bulletin No. 727-32-230 (which contains the detailed inspection and rework instructions)\n- **Applies to:** All Boeing 727 models"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text presents a standalone airworthiness directive that applies to all Boeing 727 models and sets a compliance deadline; it does not show or refer to any amendment or narrowing/widening of scope from an earlier instrument. There is no information in this document indicating a change from any prior stated intent."},"complexity_factors":["Short, single-subject directive with a clear mandatory action (low legal complexity).","Reference to an external technical document (Boeing SB No. 727-32-230) shifts technical detail out of the AD and requires implementers to consult another source.","Firm compliance deadline creates operational scheduling complexity for operators and maintenance providers.","Universal applicability to all models increases practical implementation load across the fleet.","AD text is brief and omits technical rationale and procedural detail, increasing reliance on the service bulletin and any approval processes for alternatives."],"plain_english_summary":"This directive requires inspection and, where necessary, rework of the main landing gear aft trunnion on all Boeing 727s, to be done by following Boeing Service Bulletin No. 727-32-230 and completed before 31 July 1975. It affects owners/operators (who bear the cost and downtime) and centralises the technical method in the Boeing service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-68-main-landing-gear-aft-trunnion-inspection-and-rework","history":"/api/acts/ad-b727-68-main-landing-gear-aft-trunnion-inspection-and-rework/history","analysis":"/api/acts/ad-b727-68-main-landing-gear-aft-trunnion-inspection-and-rework/analysis","conflicts":"/api/acts/ad-b727-68-main-landing-gear-aft-trunnion-inspection-and-rework/conflicts","importantCases":"/api/acts/ad-b727-68-main-landing-gear-aft-trunnion-inspection-and-rework/important-cases","documents":"/api/acts/ad-b727-68-main-landing-gear-aft-trunnion-inspection-and-rework/documents"}}