{"id":"F2006B04955","name":"AD/CESSNA 170/24 Amdt 2 - Aileron Mass Balance Weight Attachment Rivets","slug":"ad-cessna-170-24-amdt-2-aileron-mass-balance-weight-attachment-rivets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44826,"registerId":"commonwealth-F2006B04955-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 170/24 Amdt 2 - Aileron Mass Balance Weight Attachment Rivets","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)  Cessna 170, 172, F172, FR172 and 175 Series Aeroplanes\n\n \n\nAD/CESSNA 170/24\n\nAmdt 2\n\nApplicability: All models.\n\n\nAileron Mass Balance Weight Attachment Rivets\n\n\n12/85\n\n \n\nRequirement: Inspect the rivets attaching the lower aileron skin to the balance weight for corrosion.\n\nWhere corrosion is suspected under the rivet heads, attempts should be made to remove the rivet heads by a light sharp blow with a screwdriver. All damaged or corroded rivets must be replaced.\n\n \n\nCompliance: Within 100 hours time in service after 29 September 1971 and thereafter at each issue of a new Maintenance Release.\n\n \n\nBackground:  This amendment revises the compliance requirement to coincide with varying periodic inspection intervals.\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":{"summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"Amendment 2 revises the compliance requirement wording to coincide with varying periodic inspection intervals, replacing an earlier fixed-interval approach."},"complexity_factors":["Recurring inspection requirement tied to maintenance release intervals","Applies across multiple Cessna models (170, 172, F172, FR172 and 175 series)","Narrow technical scope limited to specific rivets on the aileron mass balance assembly","Historical compliance trigger date (1971) still referenced for initial compliance"],"plain_english_summary":"This AD requires recurring inspection of the rivets attaching the lower aileron skin to the mass balance weight on Cessna 170/172/F172/FR172/175 series aeroplanes to detect corrosion. Suspected corrosion under rivet heads must be checked (lightly struck) and any damaged or corroded rivets replaced. Initial compliance was within 100 hours TIS after 29 Sep 1971 and thereafter at each maintenance release; Amendment 2 adjusted the compliance wording. It affects owners, operators and maintenance providers and must be recorded in maintenance documentation."},"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1559},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment only revises the compliance timing (when inspections must occur) to accommodate varying periodic inspection intervals. It does not expand the scope beyond the original rivet corrosion inspection for these specific Cessna models."},"complexity_factors":["Single-page instrument with one specific mechanical requirement","Limited to one aircraft system (aileron balance weight rivets)","Simple two-stage compliance structure (initial inspection + recurring at Maintenance Release)","No defined terms, cross-references, or conditional exceptions","Straightforward technical instruction with minimal regulatory layering"],"plain_english_summary":"This is a **safety rule** for owners and operators of specific Cessna aircraft (models 170, 172, F172, FR172, and 175 series). It mandates regular checks on the rivets that attach balance weights to the ailerons (the movable panels on the wingtips that help control the plane).\n\n**What must be done:**\n- Inspect the specific rivets connecting the lower aileron skin to the balance weight for **corrosion** (rust or metal deterioration)\n- If corrosion is suspected under the rivet heads, remove them by striking lightly with a screwdriver\n- Replace any rivets that are damaged or corroded\n\n**When it must be done:**\n- First inspection within **100 hours of flight time** after 29 September 1971\n- Repeated at every new **Maintenance Release** (the official safety certificate issued after periodic aircraft inspections)\n\nThis rule was updated to align inspection deadlines with modern aircraft maintenance schedules."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-170-24-amdt-2-aileron-mass-balance-weight-attachment-rivets","history":"/api/acts/ad-cessna-170-24-amdt-2-aileron-mass-balance-weight-attachment-rivets/history","analysis":"/api/acts/ad-cessna-170-24-amdt-2-aileron-mass-balance-weight-attachment-rivets/analysis","conflicts":"/api/acts/ad-cessna-170-24-amdt-2-aileron-mass-balance-weight-attachment-rivets/conflicts","importantCases":"/api/acts/ad-cessna-170-24-amdt-2-aileron-mass-balance-weight-attachment-rivets/important-cases","documents":"/api/acts/ad-cessna-170-24-amdt-2-aileron-mass-balance-weight-attachment-rivets/documents"}}