{"id":"F2006B01810","name":"AD/A109/25 Amdt 1 - Main Rotor Pitch Change Link Spherical Bearing","slug":"ad-a109-25-amdt-1-main-rotor-pitch-change-link-spherical-bearing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41008,"registerId":"commonwealth-F2006B01810-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A109/25 Amdt 1 - Main Rotor Pitch Change Link Spherical Bearing","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)  \nAgusta A109 Series Helicopters\n\nAD/A109/25\n\nAmdt 1\n\n  \nMain Rotor Pitch Change Link Spherical Bearing 3/96\n\nApplicability: Models A109C, all serial numbers up to and including 7677, excepting serial numbers 7633, 7654 and 7667; and A109K2, all serial numbers up to and including 10023 excepting serial number 10014. Models fitted with pitch control links P/N 109-0110- 71-107 are exempt from this Directive.\n\nRequirement: Action in accordance with Agusta Bolletinos Tecnico Telegrafico 109-9, or 109K-2, dated 23 March 1995, as applicable.\n\nNote: RAI AD 95-334 superseding RAI AD 95-083, and RAI AD 95-332 superseding RAI 95-082 refer.\n\nCompliance: For Model A109C: within 10 hours’ time in service after 15 March 1995; thereafter at intervals not exceeding 100 hours’ time in service.\n\nFor Model A109K2: within 10 hours’ time in service after the effective date of this Amendment, thereafter at intervals not exceeding 100 hours’ time in service.\n\nThis Amendment has effect from 29 February 1996. The initial Compliance for Model A109C remains unchanged.\n\nBackground: Increases in vibration levels have been attributed to damage to the pitch change link spherical bearings.\n\nAmendment 1 clarifies the Applicability, adds the Model A109K, and provides terminating action.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive (AD/A109/25) only applied to the A109C model. Amendment 1 expanded the scope to include the A109K2 model, effectively doubling the aircraft population covered. It also added a terminating action provision, changing the directive from an ongoing repetitive inspection requirement to one that could be permanently satisfied through modification."},"complexity_factors":["Multiple applicability conditions with serial number ranges and specific exceptions (3 exceptions for A109C, 1 for A109K2)","Cross-reference to external technical documents (Agusta Bolletinos Tecnico Telegrafico 109-9 and 109K-2) without reproducing their content","Different compliance dates for different models (A109C from 15 March 1995, A109K2 from effective date of amendment)","Reference to superseded Italian aviation directives (RAI AD 95-334, RAI AD 95-332) creating historical dependency chain","Technical part number exemption (P/N 109-0110-71-107) requiring lookup"],"plain_english_summary":"This CASA Airworthiness Directive mandates regular inspection and maintenance of main rotor pitch-change link spherical bearings on certain Agusta A109 helicopters (A109C and newly added A109K2 models), to prevent vibration or loss of control caused by bearing damage. \n\nAffected operators must carry out an initial check shortly after the effective date and repeat checks periodically, following the manufacturer’s bulletin; helicopters fitted with the specified improved part are exempt and satisfy the requirement."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 expands and clarifies the original AD: it clarifies Applicability, adds Model A109K2 to the affected fleet, and introduces a terminating action (text notes these changes). As a result the directive's scope broadened beyond the original instrument to include additional aircraft and procedural termination provisions; initial compliance for Model A109C remains unchanged (Compliance, Amendment 1, Background)."},"complexity_factors":["Model and serial-number specificity (Applicability): multiple serial-number inclusions and three explicit serial-number exceptions increase tracking complexity.","Part-number exemption (Applicability): aircraft fitted with pitch control links P/N 109-0110-71-107 are exempt, requiring operators to verify parts fitted.","External-document dependency (Requirement): mandatory compliance with Agusta Bolletinos Tecnico Telegrafico 109-9 or 109K-2 — operators must obtain and follow those bulletins to know exact actions.","Different timing rules (Compliance): A109C and A109K2 have different compliance effective dates and the A109C initial compliance is declared unchanged, requiring attention to which date applies.","Terminating action referenced but not detailed (Amendment 1): the AD provides for terminating action without specifying it in the text, forcing reliance on the referenced documents.","Cross-references to other ADs and effective date (Note/This Amendment has effect): multiple cross-references and a specific effective date (29 Feb 1996) add administrative steps for compliance records."],"plain_english_summary":"This airworthiness directive requires inspections and corrective action on the main-rotor pitch-change-link spherical bearings for specified Agusta A109C and A109K2 helicopters (certain serial numbers; some serials and parts are exempt). It implements short initial inspection windows and 100‑hour repeat intervals per Agusta technical bulletins, prompted by increased vibration traced to bearing damage."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-25-amdt-1-main-rotor-pitch-change-link-spherical-bearing","history":"/api/acts/ad-a109-25-amdt-1-main-rotor-pitch-change-link-spherical-bearing/history","analysis":"/api/acts/ad-a109-25-amdt-1-main-rotor-pitch-change-link-spherical-bearing/analysis","conflicts":"/api/acts/ad-a109-25-amdt-1-main-rotor-pitch-change-link-spherical-bearing/conflicts","importantCases":"/api/acts/ad-a109-25-amdt-1-main-rotor-pitch-change-link-spherical-bearing/important-cases","documents":"/api/acts/ad-a109-25-amdt-1-main-rotor-pitch-change-link-spherical-bearing/documents"}}