{"id":"F2006B08533","name":"AD/CH-3/2 Amdt 1 - Aileron Mass Balance - Inspection","slug":"ad-ch-3-2-amdt-1-aileron-mass-balance-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51297,"registerId":"commonwealth-F2006B08533-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CH-3/2 Amdt 1 - Aileron Mass Balance - Inspection","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)  Chrislea CH-3 Series Aeroplanes\n\n \n\nAD/CH-3/2\n\nAmdt 1\n\n\nAileron Mass Balance - Inspection NK\n\n \n\nApplicability: All series 2 not modified in accordance with Chrislea Service Bulletin No. 5 - Addendum 1.\n\n \n\nDocument: 1. Chrislea SB No. 5; or\n\n \n\n2. ANO 105.1.13.1.6.2.\n\n \n\nCompliance: At intervals not exceeding 50 hours time in service.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument is presented as Amendment 1 to AD/CH-3/2 (Amdt 1), indicating it amends a prior directive. The supplied text does not include the earlier AD or the previous wording, so the precise nature of the change(s) to scope cannot be determined from this document alone. The current text does: (a) apply to CH-3 series 2 aircraft not modified per Chrislea SB No. 5 - Addendum 1, (b) reference Chrislea SB No. 5 or ANO 105.1.13.1.6.2 for the inspection procedure, and (c) set a compliance interval of 50 hours TIS (Applicability; Document; Compliance)."},"complexity_factors":["Narrow applicability limited to Chrislea CH-3 series 2 aircraft not modified per Chrislea SB No. 5 - Addendum 1 (Applicability)","Mandatory recurring interval set at 50 hours time in service, imposing a frequent operational maintenance requirement (Compliance)","Requirement delegates technical details to external documents (Chrislea SB No. 5 or ANO 105.1.13.1.6.2), so procedural clarity depends on those documents being available and precise (Document)","Practical compliance choices: either perform recurring inspections or adopt the modification that removes applicability, creating upfront vs recurring cost trade-offs (Applicability; Compliance)","Limited information in the AD text about enforcement, acceptable alternatives, or repair criteria increases operational interpretation needs (title; Compliance)"],"plain_english_summary":"This AD mandates recurring inspections of the aileron mass balance on Chrislea CH‑3 series 2 aeroplanes (every 50 hours TIS) unless the aircraft has been modified per Chrislea Service Bulletin No. 5 – Addendum 1, which removes it from applicability. Owners/operators bear inspection, repair and downtime costs; the Civil Aviation Safety Authority enforces the requirement and points to the manufacturer’s bulletin or ANO 105.1.13.1.6.2 for the inspection procedure."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted safety directive for a specific vintage aircraft type (Chrislea CH-3). It has not expanded beyond its original purpose of ensuring aileron mass balance integrity. Amendment 1 appears to be a routine update rather than scope expansion."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 defined term implied ('time in service' — standard aviation term)","No cross-references to other legislation beyond 2 cited documents","Single, unambiguous compliance requirement (inspect every 50 hours)","Clear applicability clause with simple exclusion (Series 2 not modified per specific SB)","No conditional logic, exceptions, or nested provisions","Standard AD format following CASA template"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety instruction issued by Australia's Civil Aviation Safety Authority (CASA) that requires owners and operators of specific aircraft to take action to fix a known safety problem.\n\n**What it does:** This AD requires **inspection of the aileron mass balance** on **Chrislea CH-3 Series 2 aeroplanes** that have **not** been modified according to Chrislea Service Bulletin No. 5 - Addendum 1.\n\n- **Aileron mass balance:** A weight attached to the aileron (the moving surface on the wing that controls roll) to prevent dangerous flutter (rapid, uncontrolled vibration that can destroy the wing).\n- **Why it matters:** If the mass balance fails or is missing, the aileron can flutter, potentially causing catastrophic structural failure and loss of the aircraft.\n\n**Who must comply:** Owners/operators of affected Chrislea CH-3 Series 2 aircraft.\n\n**What they must do:** Inspect the aileron mass balance **every 50 hours of flight time** (\"time in service\").\n\n**Key documents referenced:**\n- Chrislea Service Bulletin No. 5 (the manufacturer's official safety notice)\n- ANO 105.1.13.1.6.2 (an older Air Navigation Order — predecessor aviation safety rules)\n\n**Why it exists:** This is **Amendment 1** to an existing AD, suggesting the original directive has been updated — possibly to clarify applicability, change inspection intervals, or update referenced documents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ch-3-2-amdt-1-aileron-mass-balance-inspection","history":"/api/acts/ad-ch-3-2-amdt-1-aileron-mass-balance-inspection/history","analysis":"/api/acts/ad-ch-3-2-amdt-1-aileron-mass-balance-inspection/analysis","conflicts":"/api/acts/ad-ch-3-2-amdt-1-aileron-mass-balance-inspection/conflicts","importantCases":"/api/acts/ad-ch-3-2-amdt-1-aileron-mass-balance-inspection/important-cases","documents":"/api/acts/ad-ch-3-2-amdt-1-aileron-mass-balance-inspection/documents"}}