{"id":"F2006B04874","name":"AD/CASA/18 - Power Quadrant Slots","slug":"ad-casa-18-power-quadrant-slots","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44681,"registerId":"commonwealth-F2006B04874-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CASA/18 - Power Quadrant Slots","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nCasa 212 Series Aeroplanes\n\nAD/CASA/18 Power Quadrant Slots 9/96\n\nApplicability: All models.\n\nRequirement: 1. Inspect the power control levers slot protection installed in accordance with AD/CASA/11 and/or CASA SB 212-76-05 for deterioration to the point where foreign objects may no longer be excluded from the quadrant; i.e. a quadrant slot may no longer fulfil the intent of AD/CASA/11.\n\n2. If deterioration is found, modify the quadrant in accordance with CASA SB 212-76-08.\n\nNote: Spanish DGAC AD 04/96 refers.\n\nCompliance: Within 300 hours time in service or 3 months after 15 August 1996, whichever occurs first; thereafter at intervals not exceeding 300 hours time in service or 3 months, whichever occurs first, until modified.\n\nBackground: Wear in the power lever slots may allow a foreign object to fall into the power lever quadrant and restrict the movement of, or jam, the power lever/s.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted safety directive addressing a specific mechanical wear issue in a specific aircraft type. The scope remains tightly focused on the original safety concern (foreign object intrusion into power quadrants) without expansion into broader operational or regulatory matters."},"complexity_factors":["Single, specific aircraft type (Casa 212 series)","Two straightforward requirements: inspect, then modify if needed","Only 4 defined references (AD/CASA/11, CASA SB 212-76-05, CASA SB 212-76-08, Spanish DGAC AD 04/96)","Simple compliance timeline with binary condition (hours OR months)","No nested exceptions, conditional logic, or cross-references to other legislation","Background explanation provided in plain language","Total length: approximately 150 words"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority (CASA) for **Casa 212 series aeroplanes** — a type of twin-turboprop aircraft.\n\n**What it does:**\n- Requires operators to **inspect the power control lever slots** (the openings around the throttle levers in the cockpit) for wear and tear\n- Specifically checks whether protective modifications made under an earlier directive (AD/CASA/11) are still working — i.e., whether they're still keeping foreign objects (like pens, tools, or debris) from falling into the mechanism\n- If the protection is worn out, operators must **modify the quadrant** following CASA Service Bulletin 212-76-08\n\n**Why it matters:**\nWorn slots could let foreign objects fall into the power lever mechanism. This could **jam or restrict throttle movement** — a serious flight safety hazard if pilots can't control engine power properly.\n\n**Who must comply:**\n- All operators of Casa 212 aircraft\n- Must inspect within **300 flight hours or 3 months** (whichever comes first) from 15 August 1996\n- Repeat inspections every **300 hours or 3 months** until the permanent modification is done\n\n**Key point:** This is a **recurring inspection requirement** with a permanent fix available — once modified per the service bulletin, the repeated checks are no longer needed."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"This AD extends the prior scope (installation of slot protection under AD/CASA/11 or CASA SB 212-76-05) by adding mandatory recurring inspections of that protection and a required modification if deterioration is found. It therefore changes the practical regulatory burden from a one-off installation requirement to an ongoing inspection obligation until a specified modification is completed (Requirement 1–2; Compliance)."},"complexity_factors":["Clear, limited set of actions: inspect and, if necessary, modify (Requirement 1–2).","Fixed, simple compliance intervals (300 hours or 3 months) reduce scheduling ambiguity (Compliance).","Applicability limited to a single aircraft family (Applicability).","Judgment required by maintenance personnel about when slot protection has ‘deteriorated’ creates a point of operational discretion (Requirement 1).","Obligation to follow a specific service bulletin for modification constrains remedy choice (Requirement 2).","Reference to earlier AD/SB means implementers must track prior mandated work (Requirement 1; Applicability)."],"plain_english_summary":"This AD requires operators of CASA 212 aeroplanes to carry out recurring inspections of the previously installed power-lever slot protection and, where deterioration allows foreign objects into the power quadrant, to modify the quadrant per CASA SB 212-76-08. First inspection is required within 300 flight hours or three months after 15 Aug 1996, and repeats at those intervals until modified. It targets the risk of lever restriction/jamming; operators bear inspection/modification costs and face recurring maintenance until the mandated upgrade is done."}},"importantCases":[],"_links":{"self":"/api/acts/ad-casa-18-power-quadrant-slots","history":"/api/acts/ad-casa-18-power-quadrant-slots/history","analysis":"/api/acts/ad-casa-18-power-quadrant-slots/analysis","conflicts":"/api/acts/ad-casa-18-power-quadrant-slots/conflicts","importantCases":"/api/acts/ad-casa-18-power-quadrant-slots/important-cases","documents":"/api/acts/ad-casa-18-power-quadrant-slots/documents"}}