{"id":"F2006B04868","name":"AD/CASA/12 - Flap Control Rod Joints","slug":"ad-casa-12-flap-control-rod-joints","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44675,"registerId":"commonwealth-F2006B04868-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CASA/12 - Flap Control Rod Joints","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/12 Flap Control Rod Joints  7/89 DM\n\n \n\nApplicability: All model C-212.\n\n \n\nRequirement: Action in accordance with CASA Service Bulletin 212-27-22 Rev. 3. Compliance:  Prior to 30 September 1989.\n\nBackground:  Reports have been received overseas that failed bolts, lacking positive retention, may separate from the flap linkage. This could lead to flap control system failure and asymmetric flap condition on retraction. The F.A.A. have issued an A.D. 89-05-01 on the subject.\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":2,"scope_assessment":{"changed":false,"description":"The directive's scope is consistent with its stated purpose: it targets all model C-212 aircraft to address reported bolt retention failures in the flap linkage. The instrument does not expand beyond that applicability and simply mandates compliance with a specific service bulletin by the listed date (Applicability; Requirement; Compliance)."},"complexity_factors":["Short text with a single clear requirement: follow CASA Service Bulletin 212-27-22 Rev. 3 (Requirement).","Applies to a single aircraft type set: all model C-212 (Applicability).","Relies on an external technical document for procedural detail (service bulletin), which requires operators to obtain and interpret that document (Requirement).","Imposes a fixed compliance deadline (Compliance), creating scheduling and resource-planning demands.","Technical nature of the mandated work (flap control linkage/bolts) requires qualified maintenance personnel and possible parts, adding practical complexity beyond the directive itself (Background; Requirement)."],"plain_english_summary":"This directive mandates that owners/operators of CASA C‑212 aircraft have flap control rod joints inspected and modified exactly as specified in CASA Service Bulletin 212‑27‑22 Rev. 3, to be completed prior to 30 September 1989. It responds to overseas reports (and an FAA AD) of bolts separating from flap linkages—risking flap‑control failure and asymmetric retraction—and shifts the cost and execution responsibility to operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating a particular inspection/repair."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only one defined applicability criterion (\"All model C-212\")","Single, unambiguous compliance action (follow Service Bulletin 212-27-22 Rev. 3)","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","No conditional logic, exceptions, or nested requirements","Clear, fixed deadline (30 September 1989)","Straightforward cause-and-effect safety rationale"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\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 flap control rod joints.\n\n**The safety problem:** Bolts in the flap linkage system were failing because they lacked \"positive retention\" (meaning they weren't properly secured and could fall out). If these bolts separate from the flap linkage, the pilot could lose control of the flaps — the movable surfaces on the wings that help with takeoff and landing. This could cause \"asymmetric flap condition\" (one flap working differently from the other), which is extremely dangerous during flight.\n\n**Who must act:** Anyone who owns or operates a CASA 212 aircraft.\n\n**What they must do:** Follow the instructions in CASA Service Bulletin 212-27-22 Revision 3 (a technical repair notice from the manufacturer/regulator).\n\n**Deadline:** Before 30 September 1989.\n\n**Why it matters:** This prevents potential catastrophic loss of aircraft control. The directive was issued after overseas reports of failures, and mirrors a similar US Federal Aviation Administration (FAA) safety order."}},"importantCases":[],"_links":{"self":"/api/acts/ad-casa-12-flap-control-rod-joints","history":"/api/acts/ad-casa-12-flap-control-rod-joints/history","analysis":"/api/acts/ad-casa-12-flap-control-rod-joints/analysis","conflicts":"/api/acts/ad-casa-12-flap-control-rod-joints/conflicts","importantCases":"/api/acts/ad-casa-12-flap-control-rod-joints/important-cases","documents":"/api/acts/ad-casa-12-flap-control-rod-joints/documents"}}