{"id":"F2006B07053","name":"AD/SM-205/31 Amdt 1 - Landing Gear Dampers","slug":"ad-sm-205-31-amdt-1-landing-gear-dampers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48783,"registerId":"commonwealth-F2006B07053-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-205/31 Amdt 1 - Landing Gear Dampers","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)  \nSIAI Marchetti S205 and S208 Series Aeroplanes\n\nAD/SM-205/31\n\nAmdt 1\n\n  \nLanding Gear Dampers 7/89\n\nApplicability: All models S205-18/R, 20/R, 22/R. S208 and S208A. Requirement: Action in accordance with SIAI Marchetti SB No. 205B49A.\n\nNote: RAI AD 89-28/S205-43, S208-17 Rev 2 refers.\n\nCompliance: 1. Within 100 hours time in service after 31 August 1979 and thereafter at intervals not exceeding 500 hours time in service.\n\n    2. Replace the shock absorber units with new units for:\n\n    Shock absorber units with greater than 5 years from date of manufacture or 1000 hours time in service; within six months or 50 hours time in service after 13 July 1989 whichever is earlier.\n\n    b. Shock absorber units with less than 5 years from date of manufacture or 1000 hours time in service; prior to accumulating 5 years or 1000 hours time in service whichever is the earlier.\n\nBackground: Deformation and cracking of the rubber damper assemblies may interfere with the down locking action of the main landing gear. Amendment 1 mandates the manufacturers life limit on the shock absorber units.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment stays tightly focused on its original purpose — landing gear damper safety for specific SIAI Marchetti aircraft. The change from inspection-only to mandatory replacement with life limits is a strengthening of the existing safety regime, not an expansion into new operational areas."},"complexity_factors":["Short, single-purpose instrument (approximately 200 words)","Only 4 defined applicability categories (specific aircraft models)","Two-tier compliance structure with clear time/flight hour triggers","One cross-reference to manufacturer service bulletin (SB No. 205B49A)","Simple conditional logic (age OR hours, whichever is earlier)","No nested exceptions or recursive definitions"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of specified SIAI Marchetti S205/S208 series aeroplanes in Australia to inspect and replace landing-gear rubber damper assemblies on a mandated schedule to prevent deformation/cracking that can stop the main gear locking—an imminent landing safety risk.\n\nAmendment 1 adds a mandatory life limit for these shock absorbers, making replacement compulsory after set time/usage rather than relying on inspection alone."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 makes the manufacturer's life limit on shock absorber units mandatory by specifying replacement based on age or hours and setting explicit compliance intervals, expanding from inspection timing to compulsory replacement when life limits are reached (as described in the Background and Requirement)."},"complexity_factors":["Two overlapping compliance metrics: flight hours and calendar age trigger inspections/replacement (earliest-of rules).","Time deadlines include legacy fixed dates (31 Aug 1979; 13 Jul 1989) plus rolling intervals (500 hours), complicating retrospective compliance.","Procedural detail is delegated to the manufacturer's Service Bulletin (external document required to implement the AD).","Applicability is limited to several specific submodels, requiring operators to verify model/serial applicability and maintenance records."],"plain_english_summary":"This directive requires owners/operators of SIAI Marchetti S205 (specified submodels) and S208 series aeroplanes to follow the manufacturer’s service bulletin to inspect and replace main landing‑gear shock absorber (rubber damper) units. It sets an initial inspection within 100 hours after 31 August 1979, recurring every 500 hours, and mandates replacement when units exceed specified age or hours. Operators pay for replacements; the regulator (CASA) enforces compliance; behaviour changes are regular inspections and pre‑emptive replacement to avoid down‑lock interference."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-205-31-amdt-1-landing-gear-dampers","history":"/api/acts/ad-sm-205-31-amdt-1-landing-gear-dampers/history","analysis":"/api/acts/ad-sm-205-31-amdt-1-landing-gear-dampers/analysis","conflicts":"/api/acts/ad-sm-205-31-amdt-1-landing-gear-dampers/conflicts","importantCases":"/api/acts/ad-sm-205-31-amdt-1-landing-gear-dampers/important-cases","documents":"/api/acts/ad-sm-205-31-amdt-1-landing-gear-dampers/documents"}}