{"id":"F2006B09479","name":"AD/EMB-110/39 Amdt 2 - Trim Tab Actuator Attachments","slug":"ad-emb-110-39-amdt-2-trim-tab-actuator-attachments","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53989,"registerId":"commonwealth-F2006B09479-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-110/39 Amdt 2 - Trim Tab Actuator Attachments","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)  Embraer EMB-110 (Bandeirante) Series Aeroplanes\n\n \n\n# AD/EMB-110/39\n\nAmdt 2\n\nApplicability: All models.\n\n# Trim Tab Actuator Attachments 12/87\n\n \n\nRequirement: Action in accordance with Embraer SB110-027-0083. Compliance:  Within 500 hours time in service after 3 December 1987.\n\nBackground: The Department has received reports of fractured spring pins on Australian aircraft. Pin failure could result in control surface flutter. Amdt 1 of this Directive extended compliance to all trim tab actuators. Amdt 2 of this Directive references SB110-027- 0083 which replaces existing spring pins with solid pins.\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":true,"description":"The original directive (12/87) addressed specific trim tab actuators where spring pin failures were reported. Amendment 1 expanded the scope to cover ALL trim tab actuators on the aircraft type, not just those with reported failures. Amendment 2 further evolved the scope by updating the technical method of compliance to reference a newer manufacturer service bulletin. While still focused on the same safety issue (pin failure preventing flutter), the coverage expanded from targeted to universal application across the aircraft fleet."},"complexity_factors":["Single, specific technical requirement (replace spring pins with solid pins)","Only one defined term of note ('time in service' — flight hours)","No nested exceptions or conditional logic","Short document (approximately 150 words of substantive content)","Single cross-reference to manufacturer service bulletin (SB110-027-0083)","Clear applicability statement ('All models')","Straightforward compliance deadline (500 hours after fixed date)"],"plain_english_summary":"This is an **Airworthiness Directive** — 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 **Embraer EMB-110 Bandeirante aircraft** (a Brazilian-made twin-turboprop plane) to replace spring pins in the trim tab actuator attachments with solid pins.\n\n**Why it matters:**\n- **The problem:** Spring pins in the trim tab system were fracturing (breaking). The trim tabs are small control surfaces that help pilots adjust the aircraft's pitch (nose up/down).\n- **The danger:** If these pins fail, it can cause **control surface flutter** — a rapid, uncontrolled vibration of the aircraft's control surfaces that can damage the plane or cause loss of control.\n- **The fix:** Amendment 2 updates the repair instructions to reference a specific Embraer Service Bulletin (SB110-027-0083) that replaces the faulty spring pins with stronger solid pins.\n\n**Who must comply:**\nAll operators of Embraer EMB-110 series aircraft in Australia.\n\n**When:**\nThe work must be done within 500 hours of flight time after 3 December 1987.\n\n**Key changes in this version (Amendment 2):**\n- Originally, the directive only applied to certain trim tab actuators.\n- Amendment 1 expanded it to cover **all** trim tab actuators.\n- Amendment 2 updates the technical reference to use the latest manufacturer instructions (the service bulletin)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Yes. The directive's scope was broadened in earlier amendment history: Amendment 1 extended compliance to all trim tab actuators, and Amendment 2 mandates replacement of existing spring pins with solid pins by reference to Embraer SB110-027-0083. The current text therefore moves from a narrower set of affected parts or units to a universal requirement for all trim tab actuator attachments on the EMB-110 series. (Background: \"Amdt 1 of this Directive extended compliance to all trim tab actuators. Amdt 2 of this Directive references SB110-027-0083 which replaces existing spring pins with solid pins.\")"},"complexity_factors":["Narrow technical scope limited to trim tab actuator pin replacement (low substantive legal complexity). (Applicability: \"All models.\")","Reference to an external technical document (Embraer SB110-027-0083) means compliance depends on reading/implementing that bulletin rather than the directive containing full technical detail. (Requirement: \"Action in accordance with Embraer SB110-027-0083\".)","Fixed compliance timeframe (500 hours TIS) introduces operational scheduling complexity for operators. (Compliance: \"Within 500 hours time in service after 3 December 1987\".)","Amendment history changes scope incrementally (Amdt 1 and Amdt 2), so understanding the full obligation requires attention to amendment notes. (Background discusses amendments.)","Implementation relies on physical parts supply and maintenance capability, creating practical logistic complexity beyond the text itself."],"plain_english_summary":"The directive requires Embraer EMB‑110 operators to replace spring pins that attach trim‑tab actuators with solid pins per Embraer SB110‑027‑0083, within 500 hours time‑in‑service after 3 December 1987. Operators bear parts, labour and downtime costs. The change removes a reported pin‑fracture failure mode that could allow control‑surface flutter, improving safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-110-39-amdt-2-trim-tab-actuator-attachments","history":"/api/acts/ad-emb-110-39-amdt-2-trim-tab-actuator-attachments/history","analysis":"/api/acts/ad-emb-110-39-amdt-2-trim-tab-actuator-attachments/analysis","conflicts":"/api/acts/ad-emb-110-39-amdt-2-trim-tab-actuator-attachments/conflicts","importantCases":"/api/acts/ad-emb-110-39-amdt-2-trim-tab-actuator-attachments/important-cases","documents":"/api/acts/ad-emb-110-39-amdt-2-trim-tab-actuator-attachments/documents"}}