{"id":"F2006B09733","name":"AD/F27/56 Amdt 1 - Rudder Trim Tab - Inspection","slug":"ad-f27-56-amdt-1-rudder-trim-tab-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115925,"registerId":"commonwealth-F2006B09733-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/56 Amdt 1 - Rudder Trim Tab - Inspection","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)  Fokker F27 Series Aeroplanes\n\n \n\nAD/F27/56\n\nAmdt 1\n\n\nRudder Trim Tab - Inspection NK\n\n \n\nApplicability: All models with rudder trim tabs in excess of 1000 hours time in service not incorporating SB B-169.\n\n \n\nDocument: Fokker SB B-165, Issue 3.\n\n \n\nCompliance: At intervals not exceeding 200 hours time in service.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2292},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"As Amendment 1, this maintains the original narrow scope of requiring repetitive inspections of rudder trim tabs on high-time Fokker F27 aircraft. The directive remains tightly focused on this specific airworthiness issue and does not appear to have expanded beyond the original safety intent."},"complexity_factors":["Extremely short operative text (under 100 words)","Single compliance obligation with clear time-based trigger","Dependent on external technical documents (Fokker Service Bulletins B-165 and B-169) for actual inspection procedures","Technical aviation terminology ('time in service', 'SB') used without definition within the instrument"],"plain_english_summary":"**What this requires:**\n\nThis directive mandates safety inspections of the **rudder trim tabs** (small adjustable surfaces on the aircraft's tail that help maintain straight flight) on **Fokker F27 aircraft**.\n\n**Who must comply:**\n- Operators of any Fokker F27 model where the rudder trim tab has accumulated **more than 1,000 hours** of \"time in service\" (flight time)\n- **Unless** the aircraft has already been modified according to **Fokker Service Bulletin B-169** (a manufacturer-issued technical instruction)\n\n**What must be done:**\nOperators must conduct inspections following the procedures detailed in **Fokker Service Bulletin B-165, Issue 3**.\n\n**How often:**\nThese inspections must be performed **every 200 flight hours** (or more frequently).\n\n**Why it matters:**\nWorn or cracked rudder trim tabs can compromise aircraft control. This rule ensures potential failures are detected before they become dangerous."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-56-amdt-1-rudder-trim-tab-inspection","history":"/api/acts/ad-f27-56-amdt-1-rudder-trim-tab-inspection/history","analysis":"/api/acts/ad-f27-56-amdt-1-rudder-trim-tab-inspection/analysis","conflicts":"/api/acts/ad-f27-56-amdt-1-rudder-trim-tab-inspection/conflicts","importantCases":"/api/acts/ad-f27-56-amdt-1-rudder-trim-tab-inspection/important-cases","documents":"/api/acts/ad-f27-56-amdt-1-rudder-trim-tab-inspection/documents"}}