{"id":"F2006B06707","name":"AD/S-76/25 Amdt 1 - MLG Positioning Rod and Lower Drag Race Rod End Assemblies","slug":"ad-s-76-25-amdt-1-mlg-positioning-rod-and-lower-drag-race-rod-end-assemblies","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114520,"registerId":"commonwealth-F2006B06707-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-76/25 Amdt 1 - MLG Positioning Rod and Lower Drag Race Rod End Assemblies","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nSikorsky S-76 Series Helicopters\n\nAD/S-76/25\n\nAmdt 1\n\n  \n\nMLG Positioning Rod and Lower Drag Race Rod End Assemblies\n\n  \n1/87\n\nDM\n\nApplicability: All models S-76A prior to S/No. 760308.\n\nRequirement: 1. Inspection in accordance with Sikorsky Alert SB 76-32-10.\n\n2. Modification in accordance with Sikorsky CSN 76-134A.\n\nNote: FAA AD 82-25-01 R 1 also refers.\n\nCompliance: 1. For aircraft with landing gear positioning rod ends with 1500 or more hours time in service after 31 December 1986; within 25 hours time in service after 31 December 1986 and thereafter at each Maintenance Release inspection.\n\nFor aircraft with landing gear positioning rod ends with less than 1500 hours time in service after 31 December 1986; before 1525 hours time in service and thereafter at each Maintenance Release inspection.\n\n2. Within 300 hours time in service after 31 December 1986 or before 30 June 1987 whichever occurs first.\n\nNote: Installation of the landing gear modification kit terminates the requirement of the inspection requirements of this Directive.\n\nBackground: This Directive has been amended to include a repetitive inspection of the landing gear positioning rod ends and modification of the main landing gear.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment expands the Directive to add a repetitive inspection regime for landing gear positioning rod ends and to require modification of the main landing gear; previously the Directive did not include these repetitive inspections and the specified modification."},"complexity_factors":["Applicability limited to S‑76A helicopters prior to S/No. 760308 (narrow fleet scope)","Time‑based conditional compliance: different actions depending on whether rod ends had ≥1500 hours or <1500 hours after 31 Dec 1986","Mixed deadline types: short interval after 31 Dec 1986 (25 hours), absolute hour threshold (1525 hours), recurring at each Maintenance Release, and a calendar cutoff for modification (by 30 June 1987)","External normative references: inspection and modification are defined by Sikorsky Alert SB 76‑32‑10 and CSN 76‑134A (operators must obtain and follow these documents)","Terminating action: installation of the landing gear modification kit cancels the inspection requirement (creates an elective compliance path)","Cross‑reference to FAA AD 82‑25‑01 R 1 (inter-jurisdictional coordination may affect recordkeeping or duplicate obligations)"],"plain_english_summary":"This airworthiness directive applies to Sikorsky S‑76A helicopters with serial numbers before 760308. It requires operators to perform recurring inspections of main landing gear positioning rod ends (per Sikorsky Alert SB 76‑32‑10) and to install a landing‑gear modification (per Sikorsky CSN 76‑134A). Deadlines depend on recorded rod‑end hours and an absolute calendar cutoff; installing the modification ends the inspection requirement. It matters to operators because it creates inspection, modification, and scheduling costs and changes maintenance obligations."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive likely only required a one-time modification. This amendment expands the scope to include ongoing, repetitive inspections of the positioning rod ends until the modification is completed. The 'Background' note explicitly states this expansion: 'This Directive has been amended to include a repetitive inspection.'"},"complexity_factors":["Short, single-purpose document (1 page)","Only 4 defined applicability criteria (aircraft model, serial number range)","Two-tier compliance schedule based on flight hours threshold (1,500 hours)","Simple conditional logic: 'whichever occurs first' clause for modification deadline","Cross-reference to external technical documents (Sikorsky Alert SB 76-32-10, CSN 76-134A, FAA AD 82-25-01 R 1) — but these are cited rather than reproduced","No nested definitions or interpretive sections"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections and a mandatory modification of the main landing gear on Sikorsky S‑76A helicopters with serial numbers before 760308, targeting the positioning rod and lower drag race rod end assemblies. It requires prompt recurring checks based on accumulated hours and installation of an updated landing‑gear kit within specified flight‑hour/date limits.\n\nIt matters because worn or failing gear components can cause catastrophic accidents; once the kit is fitted, repetitive inspections cease."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-25-amdt-1-mlg-positioning-rod-and-lower-drag-race-rod-end-assemblies","history":"/api/acts/ad-s-76-25-amdt-1-mlg-positioning-rod-and-lower-drag-race-rod-end-assemblies/history","analysis":"/api/acts/ad-s-76-25-amdt-1-mlg-positioning-rod-and-lower-drag-race-rod-end-assemblies/analysis","conflicts":"/api/acts/ad-s-76-25-amdt-1-mlg-positioning-rod-and-lower-drag-race-rod-end-assemblies/conflicts","importantCases":"/api/acts/ad-s-76-25-amdt-1-mlg-positioning-rod-and-lower-drag-race-rod-end-assemblies/important-cases","documents":"/api/acts/ad-s-76-25-amdt-1-mlg-positioning-rod-and-lower-drag-race-rod-end-assemblies/documents"}}