{"id":"F2006B04880","name":"AD/CASA/23 - Aileron Control Rod Movable Joint","slug":"ad-casa-23-aileron-control-rod-movable-joint","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44687,"registerId":"commonwealth-F2006B04880-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CASA/23 - Aileron Control Rod Movable Joint","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/23 Aileron Control Rod Movable Joint 9/96\n\nApplicability: All models.\n\n \n\nRequirement: Action in accordance with CASA SB 212-27-48.\n\n \n\nNote: Spanish DGAC AD 05/96 refers.\n\n \n\nCompliance: Within 100 hours time in service after 15 August 1996.\n\n \n\nBackground: Excessive wear has been discovered in the spherical bearings of the aileron command bar at the base of the control column. The wear is the result of inadequate retaining washers, and may result in the displacement of the bearings from their housings.\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":2,"scope_assessment":{"changed":false,"description":"The AD's scope is stated within the instrument: it applies to all CASA 212 models and requires action per CASA SB 212-27-48 within a fixed time (100 hours TIS after 15 August 1996). There is no indication in the text that the AD expands or narrows that scope beyond these elements (Applicability; Requirement; Compliance)."},"complexity_factors":["Single, narrowly framed directive referencing one specific service bulletin (low procedural complexity) (Requirement).","Broad fleet applicability (all CASA 212 models) increases operational reach but not legal complexity (Applicability).","Short compliance window (100 hours TIS) raises scheduling and logistical pressure for operators (Compliance).","Dependence on external technical document (CASA SB 212-27-48) and reference to a foreign AD creates a dependency on external technical content and parts availability (Requirement; Note).","Technical subject matter (airframe control bearings) requires certified maintenance capability, adding practical complexity despite simple legal form (Background)."],"plain_english_summary":"What this instrument changes mechanically\n\n- The directive requires operators of CASA 212 series aeroplanes to carry out the work specified in CASA Service Bulletin SB 212-27-48 (\"Action in accordance with CASA SB 212-27-48.\") and to do so within 100 hours time-in-service after 15 August 1996 (\"Compliance: Within 100 hours time in service after 15 August 1996.\"). (Requirement; Compliance.)\n\nWho it affects\n\n- All CASA 212 aeroplanes are covered (\"Applicability: All models.\"). Operators, owners and the maintenance organisations that service those aeroplanes must arrange and pay for the required inspections and corrective work. (Applicability; Requirement.)\n\nWhy it matters (official rationale and practical implications)\n\n- The technical reason given is excessive wear found in the spherical bearings of the aileron command bar at the base of the control column, caused by inadequate retaining washers; that wear may allow the bearings to be displaced from their housings. (Background.)\n\n- Mechanically, the AD compels a specific maintenance action (as set out in the referenced service bulletin) within a defined short timeframe. That creates a near-term obligation to inspect and, if necessary, replace or repair bearings and associated retainers per the bulletin.\n\nCosts, incentives and trade-offs (source-grounded observations)\n\n- Who pays: Aircraft operators/owners bear the direct costs (labour, parts, aircraft downtime) of complying with the service bulletin because the AD obliges the operator to carry out the work within the stated time. (Applicability; Requirement; Compliance.)\n\n- Decision authority and discretion: The Civil Aviation Safety Authority (CASA) sets the mandatory action by issuing the AD and identifying the service bulletin as the required method of compliance. The AD itself points to the SB for technical detail, limiting scope for alternative procedures unless otherwise approved by CASA. (Requirement.)\n\n- Compliance burden and operational impact: The short compliance window (100 hours TIS) creates scheduling pressure for operators and maintenance providers; it may cause temporary aircraft downtime and create demand for replacement parts or specialised labour. (Compliance; Requirement.)\n\n- Implementation risk and dependencies: The AD references an external technical document (CASA SB 212-27-48) for the required work and also notes a related foreign authority AD (Spanish DGAC AD 05/96). This creates dependency on the content and availability of that service bulletin and on any parts or tooling it specifies. (Requirement; Note.)\n\nEffects on private enterprise and market considerations\n\n- Maintenance providers: Independent maintenance organisations can perform the mandated work if they follow the SB; the AD therefore generates short-term commercial work for those firms but also requires them to meet the SB's technical requirements. (Requirement.)\n\n- Competition and ownership: The AD does not change ownership rights or market entry rules. It does impose an operational cost on all CASA 212 operators equally (\"Applicability: All models.\"), which may be concentrated on those operators still flying the type. (Applicability.)\n\n- Prices and productivity: Operators face one-off or periodic maintenance costs and potential aircraft downtime that reduce available flying hours until compliance is achieved; the AD does not directly regulate fares, contracts or competitive behaviour beyond imposing a safety-related maintenance obligation. (Compliance; Requirement.)\n\nPractical next steps for affected parties\n\n- Consult CASA SB 212-27-48 immediately to determine the detailed inspection and corrective steps required. (Requirement.)\n- Schedule the work within 100 hours TIS after 15 August 1996 and record compliance in maintenance logs. (Compliance.)\n\nSource citations: Applicability: All models; Requirement: Action in accordance with CASA SB 212-27-48; Compliance: Within 100 hours time in service after 15 August 1996; Background: Excessive wear ... inadequate retaining washers ... displacement of the bearings; Note: Spanish DGAC AD 05/96 refers."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspection/repair of aileron control rod bearings."},"complexity_factors":["Extremely short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced (CASA SB 212-27-48)","No cross-references to other legislation or regulations beyond the single service bulletin","Simple conditional logic: single applicability criterion (all models) and single compliance deadline","No nested exceptions or conditional sub-clauses","Straightforward factual background with clear causal chain"],"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 like a compulsory recall notice, but for aircraft rather than cars.\n\n**What it does:** It requires owners and operators of all CASA 212 series aeroplanes (a type of twin-turboprop aircraft) to inspect and fix a specific mechanical problem with the aileron control system — the parts that help steer the plane left and right.\n\n**The problem:** The spherical bearings (ball-and-socket joints) in the aileron control rod at the base of the control column were wearing out excessively. This happened because the retaining washers (metal rings that hold parts in place) weren't adequate. If left unfixed, the bearings could pop out of their housings, potentially causing loss of roll control — a serious flight safety risk.\n\n**What must be done:** Operators must follow the instructions in CASA Service Bulletin 212-27-48 (a technical repair notice) to fix the issue.\n\n**Who it affects:** Anyone who owns, operates, or maintains CASA 212 series aircraft in Australia.\n\n**When it had to be done:** Within 100 flight hours after 15 August 1996.\n\n**Why it matters:** This directive prevents potential catastrophic failure of the aircraft's primary roll control system. The reference to a Spanish aviation authority directive (DGAC AD 05/96) indicates this was a known international safety issue."}},"importantCases":[],"_links":{"self":"/api/acts/ad-casa-23-aileron-control-rod-movable-joint","history":"/api/acts/ad-casa-23-aileron-control-rod-movable-joint/history","analysis":"/api/acts/ad-casa-23-aileron-control-rod-movable-joint/analysis","conflicts":"/api/acts/ad-casa-23-aileron-control-rod-movable-joint/conflicts","importantCases":"/api/acts/ad-casa-23-aileron-control-rod-movable-joint/important-cases","documents":"/api/acts/ad-casa-23-aileron-control-rod-movable-joint/documents"}}