{"id":"F2006B04183","name":"AD/BEECH 76/8 - Rudder and Rudder Trim Tab","slug":"ad-beech-76-8-rudder-and-rudder-trim-tab","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43936,"registerId":"commonwealth-F2006B04183-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 76/8 - Rudder and Rudder Trim Tab","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)  Beechcraft 76 (Duchess) Series Aeroplanes\n\n \n\nAD/BEECH 76/8 Rudder and Rudder Trim Tab 4/80\n\nApplicability: All model 76 with S/Nos. ME-1 to ME-316. Requirement:  Action in accordance with Beechcraft SI No. 1116. Compliance:               Within 25 hours’ time in service after 11 March 1980.\n\nBackground: There is a possibility of water accumulating in the rudder and/or trim tab.\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\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-limited safety directive from 1980 with a narrow, specific scope (one aircraft model, specific serial number range, single maintenance action). It has not expanded beyond its original purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 4 defined elements: applicability (specific serial numbers), requirement (single reference to manufacturer document), compliance deadline, and background","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No conditional logic or exceptions — applies to all listed aircraft with a single, absolute deadline","Single operational requirement with clear, unambiguous compliance criteria","No nested definitions or interpretive provisions"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners and operators of certain Beechcraft 76 \"Duchess\" aeroplanes to take specific maintenance action to address a safety risk.\n\n**Who it affects:** Anyone who owns or operates a Beechcraft Model 76 aircraft with serial numbers ME-1 through ME-316.\n\n**The safety issue:** Water can accumulate inside the rudder and/or the rudder trim tab (the small adjustable surface on the rudder that helps keep the plane flying straight). Water in these control surfaces can cause corrosion, imbalance, or control problems — all serious flight safety risks.\n\n**What must be done:** The aircraft must be inspected and maintained according to Beechcraft Service Instruction No. 1116 (the manufacturer's official maintenance guidance).\n\n**When:** Within 25 hours of flying time after 11 March 1980.\n\n**Why it matters:** This prevents potential loss of control or structural failure due to water damage in critical flight control components. Ignoring an AD is illegal and dangerous — aircraft cannot legally fly until the directive is complied with."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD, as supplied, sets a specific and narrow scope: it targets all Beechcraft Model 76 aircraft with serial numbers ME-1 to ME-316 and requires action per Beechcraft Service Instruction No. 1116 within a single 25‑hour time‑in‑service window after 11 March 1980. Nothing in the text indicates any expansion or narrowing of that scope from the instrument’s stated requirements; therefore there is no evident change in scope from its expressed intent. (Applicability; Requirement; Compliance; Background)"},"complexity_factors":["Narrow applicability limited to Beechcraft Model 76 S/N ME-1 to ME-316 (Applicability)","Single external technical reference (Beechcraft SI No. 1116) required to perform the mandated work (Requirement)","Short fixed compliance window (25 hours time in service after 11 March 1980) creates scheduling urgency but simplifies timing rules (Compliance)","No alternative compliance methods or discretionary relief stated — mandate is binary (Requirement)","Limited administrative detail in the AD itself; implementers must obtain and interpret the external service instruction (Requirement)"],"plain_english_summary":"This AD requires owners/operators of Beechcraft Model 76 (serials ME-1 through ME-316) to perform the action in Beechcraft Service Instruction No. 1116 to prevent possible water accumulation in the rudder and rudder trim tab. Compliance is mandatory within 25 hours TIS after 11 March 1980.\n\nCosts for inspection, parts and labour fall to owners/operators; the Civil Aviation Safety Authority issued the directive and the technical method is in the referenced service instruction."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-76-8-rudder-and-rudder-trim-tab","history":"/api/acts/ad-beech-76-8-rudder-and-rudder-trim-tab/history","analysis":"/api/acts/ad-beech-76-8-rudder-and-rudder-trim-tab/analysis","conflicts":"/api/acts/ad-beech-76-8-rudder-and-rudder-trim-tab/conflicts","importantCases":"/api/acts/ad-beech-76-8-rudder-and-rudder-trim-tab/important-cases","documents":"/api/acts/ad-beech-76-8-rudder-and-rudder-trim-tab/documents"}}