{"id":"F2006B04883","name":"AD/CASA/3 - Wing Flap Control Hinge Bearing - Replacement","slug":"ad-casa-3-wing-flap-control-hinge-bearing-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44690,"registerId":"commonwealth-F2006B04883-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CASA/3 - Wing Flap Control Hinge Bearing - Replacement","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/3 Wing Flap Control Hinge Bearing - Replacement 3/83\n\nApplicability: All models CASA-212 with S/Nos. referenced in the requirement document. Document:               Construcciones Aeronauticas SB 212-27-19.\n\nCompliance: Within 100 hours time in service after 31 March 1983 unless previously accomplished.\n\n \n\nBackground: The manufacturer reports breakage and corrosion of premod bearings.\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, time-bound safety directive from 1983 addressing a specific mechanical defect. It has not expanded beyond its original purpose of mandating bearing replacement on affected aircraft."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 operative provisions: applicability, document reference, compliance deadline, and background","No defined terms section — all language is technical but self-explanatory","Single cross-reference to manufacturer service bulletin (SB 212-27-19)","No conditional logic, exceptions, or nested provisions","Linear structure: applicability → requirement → deadline → rationale"],"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). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it requires:** Owners and operators of **CASA-212 series aeroplanes** (a Spanish-built utility aircraft) must replace specific **wing flap control hinge bearings** within 100 hours of flying time after 31 March 1983.\n\n**Why it matters:** The manufacturer found these bearings were breaking and corroding. Wing flaps are crucial for controlling lift during takeoff and landing. Failed bearings could jam or detach the flaps, potentially causing loss of control.\n\n**Who must comply:** Anyone operating a CASA-212 with serial numbers listed in the manufacturer's Service Bulletin 212-27-19. The work had to be done by the deadline unless already completed.\n\n**Key point:** This is **time-critical safety maintenance** — not optional. Non-compliance means the aircraft cannot legally fly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD, as written, confines its scope to CASA-212 aeroplanes with the serial numbers listed in the referenced service document and mandates replacement of the premod hinge bearings within the stated time. The directive's content is consistent with the stated manufacturer report (Background) and does not expand beyond replacing the specified bearings or adding other requirements in the provided text (Applicability; Document; Compliance; Background)."},"complexity_factors":["Narrow technical scope (single part: wing flap control hinge bearings) reduces legal complexity.","External reference to a manufacturer document (Construcciones Aeronauticas SB 212-27-19) requires operators to obtain and follow another document, adding procedural steps.","Time-based compliance window (100 hours TIS) requires operational scheduling and tracking.","Applicability limited to serial numbers listed in the referenced document — requires cross-checking aircraft records.","Safety-critical maintenance task may require certified personnel and parts sourcing, introducing logistical complexity."],"plain_english_summary":"### What this directive does\n\nThis Airworthiness Directive (AD) requires replacement of the wing flap control hinge bearings on certain CASA 212 aeroplanes. The directive applies to all CASA-212 models listed by serial number in the manufacturer's requirement document (Construcciones Aeronauticas SB 212-27-19) (Applicability; Document).\n\nMechanically, the rule obliges operators to have the specified hinge bearings replaced within 100 hours time in service after 31 March 1983 unless the replacement has already been done (Compliance).\n\n### Who this affects\n\n- Aircraft owners and operators of CASA 212 aeroplanes that have the serial numbers listed in the referenced requirement document (Applicability; Document).\n- Maintenance organisations or engineers who perform the bearing replacement and record the work.\n\n### Why it matters (stated reason and practical implications)\n\n- The manufacturer reported breakage and corrosion of the premod bearings; the AD follows that report and sets a mandatory replacement requirement (Background). This is the directive’s stated safety rationale.\n\n- Who pays: aircraft owners/operators bear the direct costs — parts, labour and aircraft downtime — of carrying out the replacement (Compliance; Applicability). The compliance window (100 hours TIS) creates a near-term scheduling and cashflow requirement for affected operators.\n\n- Who decides: the Civil Aviation Safety Authority issued the AD and tied the technical requirement to the manufacturer’s service bulletin (Document). Operators must follow the manufacturer document to determine which serial numbers and parts are affected and what work is required.\n\n- Behaviour change required: operators must locate affected aircraft by serial number, arrange the bearing replacement per the referenced document, and accomplish it within the stated time limit (Compliance; Document).\n\n### Implementation and practical trade-offs\n\n- Compliance burden: locating affected serial numbers, procuring parts, scheduling maintenance, and completing the work within 100 hours TIS impose operational and administrative costs. The requirement document is external to the AD, so operators must obtain and follow that document to identify affected aircraft and the exact procedure (Document).\n\n- Incentives and costs: operators incur immediate costs to avoid non-compliance and to address the manufacturer-identified failure mode (Background). The cost is concentrated on operators of the listed serial-number aircraft; other CASA 212 operators are not affected unless their serial numbers are listed (Applicability).\n\n- Implementation risks and opportunity costs: potential delays if parts or qualified maintenance capacity are limited, and aircraft out-of-service time while work is done. The AD does not specify alternatives, inspection-only options, or a staged replacement schedule — it sets a replacement within the 100-hour window (Compliance).\n\n- Bureaucratic discretion: the AD references the manufacturer’s service document for the technical requirement (Document). The AD defines the compliance deadline and applicability; it does not, within the text provided, set penalties or exemptions.\n\n### Concrete mechanics (sections cited)\n\n- Applicability: all CASA-212 models with serial numbers specified in Construcciones Aeronauticas SB 212-27-19 (Applicability; Document).\n- Required action and timing: replacement of wing flap control hinge bearings within 100 hours time in service after 31 March 1983 unless already accomplished (Compliance).\n- Stated reason: manufacturer reports of breakage and corrosion of premod bearings (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-casa-3-wing-flap-control-hinge-bearing-replacement","history":"/api/acts/ad-casa-3-wing-flap-control-hinge-bearing-replacement/history","analysis":"/api/acts/ad-casa-3-wing-flap-control-hinge-bearing-replacement/analysis","conflicts":"/api/acts/ad-casa-3-wing-flap-control-hinge-bearing-replacement/conflicts","importantCases":"/api/acts/ad-casa-3-wing-flap-control-hinge-bearing-replacement/important-cases","documents":"/api/acts/ad-casa-3-wing-flap-control-hinge-bearing-replacement/documents"}}