{"id":"F2006B07081","name":"AD/SM-260/4 Amdt 3 - Main Landing Gear Control Bellcrank Bolts","slug":"ad-sm-260-4-amdt-3-main-landing-gear-control-bellcrank-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48843,"registerId":"commonwealth-F2006B07081-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-260/4 Amdt 3 - Main Landing Gear Control Bellcrank Bolts","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-260/4\n\nAmdt 3\n\n\nMain Landing Gear Control Bellcrank Bolts 5/88\n\n \n\nApplicability: Models F260, F260B, F260C and F260D with S/Nos listed in SIAI-Marchetti SB No 260B36 revision C.\n\n \n\nRequirement: Action in accordance with SIAI-Marchetti Service Bulletin No 260B36 revision C.\n\n \n\nNote: RAI AD No 87-227/F260-29 Rev 3 refers.\n\n \n\nCompliance: At maintenance inspection intervals as listed in the Requirement document.\n\n \n\nNote: Improved replacement bolts P/No 260-14-35-5 are now inspected at maintenance intervals not exceeding 1500 hours time in service.\n\n \n\nBackground:  This amendment has been raised to expand applicability and inspection intervals in accordance with a revision of the Requirement document.\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":true,"description":"Originally this AD likely applied to a narrower set of aircraft or had different inspection intervals. Amendment 3 explicitly 'expands applicability and inspection intervals' — meaning the safety concern was found to affect more planes than initially thought, or experience showed the original inspection schedule was inadequate."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined applicability criteria (specific aircraft models and serial numbers)","Single requirement referencing an external technical document (Service Bulletin)","No nested conditional logic or exceptions","Straightforward compliance timeline (maintenance intervals)","Minimal cross-referencing (one note to a related Italian aviation authority directive)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific **SIAI Marchetti 260 series aircraft** (models F260, F260B, F260C, and F260D with certain serial numbers).\n\n**What it does:**\n- Requires owners and operators to inspect or replace **main landing gear control bellcrank bolts** — critical components that help control the landing gear mechanism.\n- The work must follow **SIAI-Marchetti Service Bulletin No 260B36 revision C** (a manufacturer's technical instruction).\n\n**Who it affects:**\n- Owners and operators of the affected aircraft models.\n- Maintenance engineers responsible for keeping these planes airworthy.\n\n**Why it matters:**\n- Landing gear failures can be catastrophic. This directive prevents accidents by ensuring bolts are inspected regularly and replaced with improved parts when needed.\n- **Amendment 3** expands which aircraft are covered and adjusts how often inspections must occur.\n\n**Key compliance point:**\n- If your aircraft has the improved replacement bolts (part number 260-14-35-5), you must inspect them **every 1,500 flight hours** or less."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expands the set of affected aircraft and revises inspection intervals in line with the revised Service Bulletin. It also specifies a separate maximum inspection interval (1500 hours TIS) for improved replacement bolts P/No 260‑14‑35‑5. (See: Background; Applicability; Note.)"},"complexity_factors":["Cross-reference to an external technical document (Requirement: SIAI‑Marchetti Service Bulletin No 260B36 revision C) — obligations depend on the SB's technical content and schedules.","Applicability is limited to specific models and serial numbers listed in the Service Bulletin (Applicability) — operators must match aircraft to the SB list to determine obligation.","Compliance timing is determined by inspection intervals set in the Service Bulletin rather than fixed calendar times in the AD text (Compliance) — variable scheduling and record‑keeping required.","Specific part‑numbered replacement bolts have their own inspection limit (Note: P/No 260‑14‑35‑5 inspected at intervals not exceeding 1500 hours TIS) — creates a separate tracking requirement for that part.","Amendment changed scope (Background) — operators may need to revise prior maintenance plans and confirm historical compliance for newly captured aircraft.","Statutory placement in the Airworthiness Directives schedule makes compliance mandatory for regulated operators — enforcement and documentation obligations follow standard AD practice."],"plain_english_summary":"Mandates inspection and any required action for the main landing gear control bellcrank bolts on specified SIAI‑Marchetti F260 series aeroplanes by requiring compliance with SIAI‑Marchetti Service Bulletin No 260B36 revision C. Affects aircraft owners, operators and maintenance organisations: inspections must be carried out at the intervals set out in the Service Bulletin, and improved replacement bolts (P/No 260‑14‑35‑5) must be inspected at intervals not exceeding 1500 hours time in service. The amendment expands applicability and revises inspection intervals."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-260-4-amdt-3-main-landing-gear-control-bellcrank-bolts","history":"/api/acts/ad-sm-260-4-amdt-3-main-landing-gear-control-bellcrank-bolts/history","analysis":"/api/acts/ad-sm-260-4-amdt-3-main-landing-gear-control-bellcrank-bolts/analysis","conflicts":"/api/acts/ad-sm-260-4-amdt-3-main-landing-gear-control-bellcrank-bolts/conflicts","importantCases":"/api/acts/ad-sm-260-4-amdt-3-main-landing-gear-control-bellcrank-bolts/important-cases","documents":"/api/acts/ad-sm-260-4-amdt-3-main-landing-gear-control-bellcrank-bolts/documents"}}