{"id":"F2006B07084","name":"AD/SM-260/7 - Landing Gear Actuator Brackets - Inspection and Modification","slug":"ad-sm-260-7-landing-gear-actuator-brackets-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48846,"registerId":"commonwealth-F2006B07084-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-260/7 - Landing Gear Actuator Brackets - Inspection and Modification","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)  SIAI Marchetti 260 Series Aeroplanes\n\n \n\nAD/SM-260/7 Landing Gear Actuator Brackets - Inspection\n\nand Modification\n\n\n7/73\n\n \n\nApplicability: All models F260 and F260B with S/Nos. 101 to 125, 2-26 to 2-57, 2-59 to 2-61, 3-76\n\nto 3-81, 3-84 and 502.\n\n \n\nDocument: SIAI Marchetti SB No. 260B13.\n\n \n\nCompliance: 1. Inspect within 25 hours time in service after 17 July 1975 and thereafter at intervals not exceeding 50 hours time in service until modified.\n\n \n\n2. Modify before 1 September 1976.\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, targeted safety directive focused on a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of ensuring landing gear actuator bracket integrity."},"complexity_factors":["Very short document (under 200 words)","Only 4 defined elements: applicability (aircraft models/serial numbers), reference document (Service Bulletin), and two compliance requirements","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Simple conditional logic: inspect first, then modify by deadline","Clear, unambiguous deadlines and intervals"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners and operators of certain SIAI Marchetti 260 series aeroplanes (models F260 and F260B with specific serial numbers) to:\n- **Inspect** the landing gear actuator brackets within 25 flight hours after 17 July 1975, then repeat this inspection every 50 flight hours until the modification is done\n- **Modify** the brackets before 1 September 1976 (per the manufacturer's Service Bulletin 260B13)\n\n**Who it affects:** Owners and operators of the listed SIAI Marchetti aircraft — specifically those with serial numbers 101–125, 2-26 to 2-57, 2-59 to 2-61, 3-76 to 3-81, 3-84, and 502.\n\n**Why it matters:** Landing gear actuator brackets are critical structural components. If they fail, the landing gear could collapse. This AD addresses a known safety defect by mandating both temporary inspections (to catch problems early) and a permanent fix (the modification)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope remains as stated: it applies only to the listed F260 and F260B serial numbers and requires inspections per the timetable and a mandatory modification by 1 September 1976, following SIAI Marchetti SB No. 260B13 (Applicability; Document; Compliance 1–2). There is no information in the provided text indicating any change from that original scope."},"complexity_factors":["Narrow applicability limited to specific models and serial numbers (Applicability).","Clear, short timetable with only two mandatory requirements: recurring inspections until modification, and a fixed modification deadline (Compliance 1–2).","Reference to a single external technical document (SIAI Marchetti SB No. 260B13) for procedural detail (Document).","No multiple conditional pathways, approvals, or alternative methods set out in the text (absence of complexity).","Operational complexity arises mainly from logistics (scheduling inspections and modification) rather than legal ambiguity."],"plain_english_summary":"What this instrument does, in plain language\n\n- What it changes mechanically: This Airworthiness Directive (AD/SM-260/7) orders owners/operators of certain SIAI Marchetti 260-series aeroplanes to inspect and then modify the landing gear actuator brackets according to SIAI Marchetti Service Bulletin No. 260B13. (See: Applicability; Document: SIAI Marchetti SB No. 260B13; Compliance 1–2.)\n\n- Who it affects: Owners and operators of F260 and F260B aeroplanes having the serial numbers listed in the Applicability section: all models F260 and F260B with S/Nos. 101 to 125, 2-26 to 2-57, 2-59 to 2-61, 3-76 to 3-81, 3-84 and 502. (See: Applicability.)\n\n- What behaviour it requires and when: Operators must inspect the specified landing gear actuator brackets within 25 hours time in service after 17 July 1975 and then re-inspect at intervals not exceeding 50 hours time in service until the modification required by the directive has been carried out. The required modification must be completed before 1 September 1976. (See: Compliance 1–2.)\n\n- Document reference that governs how to do it: The inspections and modification are to be performed in accordance with SIAI Marchetti Service Bulletin No. 260B13. (See: Document: SIAI Marchetti SB No. 260B13.)\n\nStated purpose and how to evaluate it\n\n- Stated/attributed purpose: The AD implements the actions set out in SIAI Marchetti SB No. 260B13 (Document line). The bulletin is the source document for what to inspect and how to modify the brackets. The instrument itself does not set out a narrative explanation in the text provided here; it prescribes the inspections and a mandatory modification deadline. (See: Document; Compliance.)\n\n- Practical trade-offs and implementation considerations:\n  - Who pays: Aircraft owners or operators bear the cost of inspections, repeated re-inspections until modification, and the modification itself (Compliance 1–2). Those costs include parts, labour, and any aircraft downtime while work is carried out.\n  - Who decides and enforces: The Civil Aviation Safety Authority issued this AD under Part 39 (header). Operators must follow the AD’s timetable and the referenced service bulletin; CASA or its authorised inspectors administer compliance under airworthiness regulation (header). (See: header referencing Civil Aviation Safety Authority; Part 39.)\n  - Compliance burden: The directive creates an initial short-term inspection deadline (within 25 hours TIS after 17 July 1975) followed by frequent inspections (every 50 hours TIS) until the modification is done (Compliance 1). It also creates a hard deadline to modify (before 1 September 1976) (Compliance 2). Recordkeeping and scheduling are required to show inspections occurred within those intervals.\n  - Operational effects and opportunity cost: Operators may need to schedule inspections and modification work that can take aircraft out of service temporarily. Until modification is complete, aircraft remain subject to the repeated inspection interval, which can increase maintenance overhead and potentially reduce available flight hours.\n  - Implementation risk and compliance friction: Risks include missed inspection intervals or delays in completing the required modification before the deadline; such lapses would leave the operator non-compliant with the AD. The AD itself does not describe enforcement penalties in this text; enforcement follows civil aviation regulation processes under Part 39. (See: header referencing Civil Aviation Safety Authority; Part 39.)\n  - Bureaucratic discretion: The AD prescribes specific timing and refers to a manufacturer service bulletin for the technical method. Any variations, repairs, or alternative methods would depend on the regulator’s approval process (not detailed in this text). (See: Document; Compliance.)\n\nNet effect in plain terms\n\nOperators of the listed SIAI Marchetti F260/F260B aircraft must carry out a short-term inspection regime and then complete a mandated modification by a fixed date, following the referenced service bulletin. Owners/operators pay for inspections and modification and must schedule the work to meet the AD’s specified intervals and deadline. The Civil Aviation Safety Authority is the issuing/enforcing authority referenced in the instrument header."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-260-7-landing-gear-actuator-brackets-inspection-and-modification","history":"/api/acts/ad-sm-260-7-landing-gear-actuator-brackets-inspection-and-modification/history","analysis":"/api/acts/ad-sm-260-7-landing-gear-actuator-brackets-inspection-and-modification/analysis","conflicts":"/api/acts/ad-sm-260-7-landing-gear-actuator-brackets-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-sm-260-7-landing-gear-actuator-brackets-inspection-and-modification/important-cases","documents":"/api/acts/ad-sm-260-7-landing-gear-actuator-brackets-inspection-and-modification/documents"}}