{"id":"F2006B09740","name":"AD/F27/82 - RH Aileron Trim Tab Actuator - Inspection and Modification","slug":"ad-f27-82-rh-aileron-trim-tab-actuator-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115939,"registerId":"commonwealth-F2006B09740-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/82 - RH Aileron Trim Tab Actuator - Inspection and Modification","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/F27/82 RH Aileron Trim Tab Actuator - Inspection\n\nand Modification\n\n\n1/74\n\n \n\nApplicability: All model F27 with Airesearch Aileron Trim Tab Actuator RH P/N 525458, 540601- 1 or 540604-2-1 with S/Nos. prior to -355.\n\n \n\nDocument: 1. Inspection - Fokker SB 27-96;\n\n \n\n2. Modification - Fokker SB 27-105.\n\n \n\nCompliance: 1. Unless already accomplished before 15 February 1974.\n\n \n\n2. Unless already accomplished before 1 May 1974.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive as provided is narrowly targeted to specific Airesearch RH aileron trim tab actuator part numbers and serial numbers (S/No. prior to -355). It mandates an inspection and a modification via the referenced Fokker service bulletins with fixed cut-off dates. There is no indication in the supplied text that the directive has expanded or altered its original, narrow scope."},"complexity_factors":["Narrow applicability defined by specific aircraft model, part numbers and serial numbers (Applicability).","Compliance requires following two specific manufacturer service bulletins (SB 27-96 and SB 27-105) which determine technical steps (Document).","Fixed compliance dates with no staged options; however, the deadlines are binary (already done before date or must be done) (Compliance).","No alternative compliance pathways or exemptions are provided in the text supplied.","Administrative simplicity: short directive with only inspection and modification obligations and clear deadlines."],"plain_english_summary":"This directive mandates inspection and modification of the right‑hand aileron trim tab actuator on Fokker F27 aircraft fitted with Airesearch actuators P/N 525458, 540601‑1, or 540604‑2‑1 with S/N earlier than ‑355. Work must follow Fokker SB 27‑96 (inspection) and SB 27‑105 (modification); inspection is required unless done before 15 Feb 1974 and modification unless done before 1 May 1974. Owners/operators arrange and pay for compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical component in a specific aircraft type. It has not expanded beyond its original purpose of ensuring the airworthiness of Fokker F27 aileron trim tab actuators."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 defined part numbers and 1 serial number range in applicability","Simple two-step compliance structure (inspection + modification)","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","No nested conditions or exceptions — straightforward 'unless already accomplished' clauses","Single technical reference to manufacturer service bulletins"],"plain_english_summary":"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:**\nThis directive requires owners and operators of certain **Fokker F27 aircraft** to inspect and modify the **right-hand (RH) aileron trim tab actuator** — a mechanical component that helps control the plane's roll and keeps it flying straight.\n\n**Who it affects:**\n- All Fokker F27 model aircraft fitted with specific Airesearch aileron trim tab actuators (part numbers 525458, 540601-1, or 540604-2-1) with serial numbers below 355.\n- Aircraft operators, maintenance organisations, and owners responsible for keeping these planes airworthy.\n\n**What must be done:**\n1. **Inspection** — Check the actuator following Fokker Service Bulletin 27-96, unless already done before 15 February 1974.\n2. **Modification** — Modify the actuator following Fokker Service Bulletin 27-105, unless already done before 1 May 1974.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety requirements. If operators don't comply, the aircraft cannot legally fly. This particular AD addresses potential defects in the aileron trim system that could affect flight control safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-82-rh-aileron-trim-tab-actuator-inspection-and-modification","history":"/api/acts/ad-f27-82-rh-aileron-trim-tab-actuator-inspection-and-modification/history","analysis":"/api/acts/ad-f27-82-rh-aileron-trim-tab-actuator-inspection-and-modification/analysis","conflicts":"/api/acts/ad-f27-82-rh-aileron-trim-tab-actuator-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-f27-82-rh-aileron-trim-tab-actuator-inspection-and-modification/important-cases","documents":"/api/acts/ad-f27-82-rh-aileron-trim-tab-actuator-inspection-and-modification/documents"}}