{"id":"F2006B07072","name":"AD/SM-260/13 Amdt 2 - Nose Gear Barrel - Inspection and Replacement","slug":"ad-sm-260-13-amdt-2-nose-gear-barrel-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48827,"registerId":"commonwealth-F2006B07072-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-260/13 Amdt 2 - Nose Gear Barrel - Inspection and Replacement","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 260 Series Aeroplanes\n\nAD/SM-260/13\n\nAmdt 2\n\n  \nNose Gear Barrel \\- Inspection and Replacement 3/84\n\nApplicability: All model F260, F260B, F260C and F260C to S/N 502, 101 up to and including 125, 2-26 up to and including 2- 75, 3-76 up to and including 3-84, 17-01, 20-01, 10-09,\n\n235, 286, 287, 302, 303, 305, 375, 563, 566 up to and including 568, 635 up to and\n\nincluding 637, 712 up to and including 729.\n\nRequirement: SIAI Marchetti SB No. 260B34A.\n\nCompliance: Unless already accomplished within 100 hours time in service after 9 December 1981 and thereafter at intervals not exceeding 100 hours time in service until replaced.\n\nBackground: a. The possibility of crack development exists during normal service. Requirement and compliance revised to reflect SB intent.\n\nb. This Directive has been amended to reflect the revised applicability and Requirement Document issue.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The directive’s scope and procedural prescription were amended from an earlier version. The Background states that the Requirement and Compliance were revised to reflect the service bulletin’s intent and that the Directive’s applicability and Requirement document issue were updated. This indicates a change in which aircraft are covered and in the specific Requirement document referenced. (Background a and b)"},"complexity_factors":["Single, narrowly defined technical requirement (inspection and replacement of one component). (Requirement)","Clear, short recurrence interval stated in the directive (every 100 hours) which is easy to schedule but frequent. (Compliance)","Applicability limited to a specific list of models and serial numbers, requiring a check of each aircraft’s serial number. (Applicability)","Delegation of technical detail to an external service bulletin (SIAI Marchetti SB No. 260B34A) introduces a dependency on another document for procedural specifics. (Requirement)","Historical compliance date language (reference to 9 December 1981) may require interpretation of maintenance records for past compliance. (Compliance)","Background notes that the directive was amended, so tracking which amendment applies can add administrative steps. (Background a and b)"],"plain_english_summary":"What this instrument does, mechanically\n\n- It requires regular inspection of the nose gear barrel on specified SIAI Marchetti 260-series aeroplanes and eventual replacement following the procedures in the manufacturer’s service bulletin (SIAI Marchetti SB No. 260B34A). (Requirement)\n- It applies to a defined list of airframe models and serial numbers of the F260 family. (Applicability)\n- The inspection schedule is: carry out the inspection unless it has already been done within 100 hours time in service after 9 December 1981, and thereafter repeat inspections at intervals not exceeding 100 hours time in service until the part is replaced. (Compliance)\n\nWho is affected and who decides\n\n- Owners and operators of the listed F260-series aeroplanes must comply with the inspection and replacement requirement. (Applicability, Requirement)\n- The technical steps to be followed are those set out in SIAI Marchetti SB No. 260B34A; the directive refers the detailed work to that service bulletin. (Requirement)\n- The Civil Aviation Safety Authority issued this airworthiness directive under the Part 39 schedule of airworthiness directives. (header)\n\nWhy it matters (stated reason and mechanical implications)\n\n- The directive is prompted by the risk of crack development in the nose gear barrel during normal service; the inspections and replacement are intended to detect and address that risk. (Background a)\n- Mechanically, operators must allocate maintenance time and resources to inspect the nose gear barrel every 100 hours until the barrel is replaced. If operators choose to replace the barrel, the recurring inspection requirement ends. (Compliance)\n\nWho pays, incentives, and trade-offs\n\n- Owners/operators bear the direct costs: recurring inspection labour and downtime every 100 hours, and the one-off replacement cost when the barrel is replaced. (Compliance, Requirement)\n- The directive creates a near-term recurring cost (inspections) that ceases once replacement occurs, so operators face a trade-off between repeated inspection expense and the upfront cost of replacement. (Compliance)\n- Because the directive delegates the technical method to the manufacturer’s service bulletin, maintenance providers must follow that SB to meet the directive; this channels technical compliance through the SB’s specified procedures. (Requirement)\n\nCompliance burden, discretion and implementation risk\n\n- Compliance imposes an operational maintenance burden (repeating at intervals not exceeding 100 hours) until replacement is completed. Scheduling inspections may disrupt flight operations. (Compliance)\n- The directive ties required actions to an external document (the service bulletin), so any ambiguity or detail in that SB will determine exact labour, parts and methods; the directive itself does not specify those technical details. (Requirement)\n- The background notes that Requirement and Compliance were revised to reflect SB intent and that the directive’s applicability and Requirement document issue were amended. This indicates the directive’s scope and procedural details have been modified from earlier versions, which may affect which aircraft are covered and what exact procedures apply. (Background a and b)\n\nConcrete implementation points to watch\n\n- Confirm whether a specific aircraft’s serial number is listed in the Applicability before assuming the directive applies. (Applicability)\n- Follow SIAI Marchetti SB No. 260B34A for the exact inspection and replacement steps. (Requirement)\n- Maintain records of inspections and replacement to demonstrate compliance with the 100-hour interval requirement until replacement. (Compliance)\n\nSource references: Applicability; Requirement: SIAI Marchetti SB No. 260B34A; Compliance; Background a and b."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"Originally issued as Amendment 1 (implied by 'Amdt 2'), this directive has been revised to expand or clarify the serial number applicability and update the referenced Service Bulletin issue. The background notes explicitly state the directive was amended to 'reflect revised applicability and Requirement Document issue', indicating scope creep from the original 1981 baseline."},"complexity_factors":["Dense serial number applicability list spanning multiple ranges and individual numbers","Cross-reference to external manufacturer document (Service Bulletin 260B34A) without reproducing its content","Time-based compliance calculation requiring tracking of 'hours time in service'","Amendment history (Amdt 2) indicates evolution of requirements","Conditional compliance language ('Unless already accomplished')"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific SIAI Marchetti 260 series aircraft.\n\n**What it does:**\n- Requires owners and operators of certain F260 model aeroplanes to inspect the nose gear barrel (a critical landing gear component) for cracks\n- Mandates replacement of the part if cracks are found\n- Sets a strict inspection schedule: every 100 hours of flight time\n\n**Who it affects:**\n- Owners and operators of specific SIAI Marchetti F260, F260B, and F260C aircraft with particular serial numbers (listed in the applicability section)\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\n- Cracks in the nose gear barrel can develop during normal use and could cause landing gear failure\n- This is a **mandatory** directive — compliance is legally required, not optional\n- The directive references a manufacturer's Service Bulletin (SB 260B34A), making that document's requirements legally binding\n\n**Key compliance points:**\n- First inspection must occur within 100 flight hours after 9 December 1981\n- Continues every 100 flight hours until the part is replaced\n- If already done within that timeframe, you're covered"}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-260-13-amdt-2-nose-gear-barrel-inspection-and-replacement","history":"/api/acts/ad-sm-260-13-amdt-2-nose-gear-barrel-inspection-and-replacement/history","analysis":"/api/acts/ad-sm-260-13-amdt-2-nose-gear-barrel-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-sm-260-13-amdt-2-nose-gear-barrel-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-sm-260-13-amdt-2-nose-gear-barrel-inspection-and-replacement/important-cases","documents":"/api/acts/ad-sm-260-13-amdt-2-nose-gear-barrel-inspection-and-replacement/documents"}}