{"id":"F2006B04888","name":"AD/CASA/8 - Flight Controls - Fail-Safe Requirements","slug":"ad-casa-8-flight-controls-fail-safe-requirements","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44695,"registerId":"commonwealth-F2006B04888-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CASA/8 - Flight Controls - Fail-Safe Requirements","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)  Casa 212 Series Aeroplanes\n\n \n\nAD/CASA/8 Flight Controls - Fail-Safe Requirements 9/84\n\nApplicability: All models CASA-212.\n\n \n\nDocument: Construcciones Aeronauticas SB 212-27-25. Compliance: Prior to issue of Certificate of Airworthiness.\n\nBackground: Modification of the elevator, rudder and aileron trim tab controls is required to meet Australian Certification Requirements.\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, single-purpose airworthiness directive focused specifically on trim tab control modifications for one aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section","No cross-references to other legislation beyond a single reference to the Civil Aviation Regulations 1998","Single, unambiguous compliance requirement ('Prior to issue of Certificate of Airworthiness')","No conditional logic, exceptions, or nested provisions","References only one technical document (Construcciones Aeronauticas SB 212-27-25) without reproducing its contents"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all models of the **CASA-212 aircraft** (a Spanish-built twin-turboprop plane).\n\n**What it requires:**\nBefore a Certificate of Airworthiness can be issued for any CASA-212, the aircraft must be modified. Specifically, the **elevator, rudder, and aileron trim tab controls** must be upgraded to meet Australian safety standards.\n\n**Why this matters:**\nTrim tabs are small adjustable surfaces on the control surfaces of an aircraft that help pilots maintain steady flight without constant pressure on the controls. If these fail, the pilot could lose control of the aircraft. This directive ensures these critical flight controls have \"fail-safe\" features — meaning if something goes wrong, the system defaults to a safe state rather than a dangerous one.\n\n**Who needs to act:**\nAnyone seeking to register or operate a CASA-212 in Australia must ensure this modification is completed before the aircraft is certified as airworthy."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope aligns with its stated purpose: it applies to all CASA-212 models and requires modification of elevator, rudder and aileron trim tab controls to meet Australian Certification Requirements. The AD references the manufacturer's service bulletin for the technical work and makes completion a precondition for issue of a Certificate of Airworthiness, consistent with the Background, Document and Compliance statements."},"complexity_factors":["Narrow applicability: covers a single aircraft type (All models CASA-212) (Applicability).","Single, clearly defined action: modification of elevator, rudder and aileron trim tab controls (Background).","Clear compliance timing: must be done prior to issuance of Certificate of Airworthiness (Compliance).","Technical detail delegated to external document (Construcciones Aeronauticas SB 212-27-25), increasing reliance on that document for implementation (Document).","Regulatory enforcement tied to CASA's Certificate of Airworthiness process rather than prescribing in-AD enforcement procedures (header, Compliance).","No alternate compliance routes, waivers, or phased timelines specified in the text provided (Compliance)."],"plain_english_summary":"This AD requires modification of the elevator, rudder and aileron trim‑tab controls on all CASA‑212 aeroplanes, to be carried out per Construcciones Aeronauticas Service Bulletin SB 212‑27‑25. \n\nCompliance is mandatory before a Certificate of Airworthiness will be issued in Australia; the party seeking that certificate must arrange and fund the modification, with CASA enforcing the requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-casa-8-flight-controls-fail-safe-requirements","history":"/api/acts/ad-casa-8-flight-controls-fail-safe-requirements/history","analysis":"/api/acts/ad-casa-8-flight-controls-fail-safe-requirements/analysis","conflicts":"/api/acts/ad-casa-8-flight-controls-fail-safe-requirements/conflicts","importantCases":"/api/acts/ad-casa-8-flight-controls-fail-safe-requirements/important-cases","documents":"/api/acts/ad-casa-8-flight-controls-fail-safe-requirements/documents"}}