{"id":"F2006B09464","name":"AD/EMB-110/23 - Trim Tab Control Systems - Inspection and Modification","slug":"ad-emb-110-23-trim-tab-control-systems-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53930,"registerId":"commonwealth-F2006B09464-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-110/23 - Trim Tab Control Systems - 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)  Embraer EMB-110 (Bandeirante) Series Aeroplanes\n\n \n\n# AD/EMB-110/23 Trim Tab Control Systems - Inspection\n\nand Modification\n\nApplicability: All models EMB-110 with S/Nos. 110001 to 110364 and 110366 to 110384. Document:               Embraer SB No. 110-27-062 Parts I and II.\n\nNote: Brazilian AD 82-11-03 refers.\n\nCompliance: PART 1: Within 25 hours time in service after 25 January 1983.\n\n# 3/83\n\n \n\nPART II: Within 125 hours time in service or one month, whichever occurs first, after 25 January, 1983.\n\n \n\nBackground: Investigation by the manufacturer revealed that the attaching nuts of the actuating rod ends of the trim cab systems may become loose.\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":3,"scope_assessment":{"changed":false,"description":"The instrument implements mandatory inspections and modifications for the EMB-110 trim tab control system within specified timeframes for the listed serial numbers. The directive's scope—identifying affected aircraft, citing the Embraer service bulletin as the compliance method, and setting two compliance windows—is consistent with the stated purpose (manufacturer finding of potentially loose attaching nuts) and does not indicate an expansion or contraction of scope beyond that stated purpose in the text (Applicability; Document; Compliance; Background)."},"complexity_factors":["Narrow aircraft applicability by serial number range (Applicability)","Two-part compliance with different time limits (PART 1: 25 hours; PART II: 125 hours or one month) creating operational scheduling pressure (Compliance)","Mandated use of a manufacturer service bulletin for technical method, but the AD text does not include the technical detail itself (Document)","Reference to a foreign AD (Brazilian AD 82-11-03) which may require cross-checking additional material (Note)","No procedural detail in the AD about reporting, approvals for alternative methods, or enforcement steps, requiring implementers to consult regulator/manufacturer guidance (Civil Aviation Regulations 1998, PART 39 reference)"],"plain_english_summary":"### What this instrument does, in plain terms\n\nThis airworthiness directive (AD/EMB-110/23) requires operators of certain Embraer EMB-110 (Bandeirante) aeroplanes to inspect and modify the trim tab control system. It applies to all EMB-110 aircraft with serial numbers 110001 to 110364 and 110366 to 110384 (Applicability). The inspections/modifications must follow the procedures in Embraer Service Bulletin No. 110-27-062 Parts I and II (Document).\n\nMechanically, the directive imposes two mandatory steps with short deadlines: PART 1 inspections must be done within 25 hours time in service after 25 January 1983; PART II inspections/modifications must be done within 125 hours time in service or one month (whichever comes first) after 25 January 1983 (Compliance: PART 1; PART II).\n\nThe stated reason for the action is that the manufacturer found the attaching nuts on the actuating rod ends of the trim tab systems may become loose (Background). The directive references an equivalent Brazilian AD (Brazilian AD 82-11-03) as related material (Note).\n\n### Who this affects and who decides\n\n- Operators/owners of the affected EMB-110 aircraft are the parties required to carry out the inspections and modifications (Applicability; Compliance). They are the ones who will incur the direct costs (labour, parts, downtime). The AD itself is issued under the Commonwealth schedule of airworthiness directives (Civil Aviation Regulations 1998, PART 39 — Civil Aviation Safety Authority), so the regulator sets the mandatory requirement.\n- The method and technical details for compliance are specified by Embraer Service Bulletin No. 110-27-062 Parts I and II (Document). Maintenance organisations will implement the work using that service bulletin as the instruction set.\n\n### Practical effects, incentives and trade-offs\n\n- Immediate compliance demand: The short compliance windows (25 hours and 125 hours/one month) create near-term operational scheduling requirements for affected aircraft (Compliance: PART 1; PART II). That can cause aircraft downtime and reallocation of flight hours to meet the AD.\n- Cost bearer: The text does not provide any funding or exemption; therefore the operators bear inspection and modification costs (Applicability; Document). The AD text itself does not specify compensation, subsidies or fee changes.\n- Implementation path: The AD points to a manufacturer service bulletin for the required work (Document). This centralises the technical method to the manufacturer’s instructions, leaving limited technical discretion to maintenance providers except as permitted by standard regulatory approval processes.\n- Enforcement and verification: As an airworthiness directive in the Commonwealth schedule, the regulator requires compliance within the stated timeframes; the AD sets mandatory action and deadline but does not describe inspection reporting, certification or penalty mechanisms in this text (Civil Aviation Regulations 1998, PART 39 reference).\n\n### Risks, limits and opportunity costs\n\n- The directive targets a specific mechanical risk (loose attaching nuts on trim tab actuating rod ends) and prescribes remediation tied to a service bulletin (Background; Document). The text does not describe alternative compliance methods, staged rollouts, or financial relief; so operators must either follow the service bulletin or seek an approved alternative through regulatory processes.\n- Concentration of benefit vs. diffusion of cost: The safety benefit is concentrated on the affected aircraft and their users (owners, crews, passengers). The compliance cost is borne by those same operators; the AD does not indicate broader state financial support (Applicability; Document; Background).\n\n### Source citations\n\n- Applicability: \"All models EMB-110 with S/Nos. 110001 to 110364 and 110366 to 110384.\" (Applicability)\n- Required method: \"Embraer SB No. 110-27-062 Parts I and II.\" (Document)\n- Deadlines: \"PART 1: Within 25 hours time in service after 25 January 1983.\"; \"PART II: Within 125 hours time in service or one month, whichever occurs first, after 25 January, 1983.\" (Compliance)\n- Rationale stated: \"Investigation by the manufacturer revealed that the attaching nuts of the actuating rod ends of the trim cab systems may become loose.\" (Background)\n- Cross-reference: \"Note: Brazilian AD 82-11-03 refers.\" (Note)\n"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive for a specific aircraft type. It has not expanded beyond its original purpose of addressing a known mechanical defect in the trim tab control systems."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined applicability criteria (aircraft model and serial number ranges)","Simple two-part compliance structure with clear timeframes","No cross-references to other legislation beyond a single note about a Brazilian AD","Single technical issue addressed with straightforward remedy","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft — the Embraer EMB-110 Bandeirante.\n\n**What it does:** It orders owners and operators of these planes to inspect and modify the **trim tab control systems**. Trim tabs are small adjustable surfaces on an aircraft's control surfaces (like the elevator or rudder) that help reduce the pilot's workload by keeping the plane flying straight and level without constant pressure on the controls.\n\n**The problem:** The manufacturer found that nuts holding the actuating rod ends in the trim tab systems could work loose. If these nuts come loose, the pilot could lose control of the trim tabs, potentially making the aircraft difficult or dangerous to fly.\n\n**Who must comply:** Anyone operating an EMB-110 aircraft with serial numbers 110001 to 110364 and 110366 to 110384.\n\n**What must be done:**\n- **Part I:** Inspect the system within 25 flight hours after 25 January 1983\n- **Part II:** Complete modifications within 125 flight hours or one month (whichever comes first) after the same date\n\n**Why it matters:** This is a mandatory safety fix. Non-compliance means the aircraft cannot legally fly in Australian airspace. The directive references an Embraer Service Bulletin and a Brazilian airworthiness directive, showing how aviation safety relies on international cooperation between regulators and manufacturers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-110-23-trim-tab-control-systems-inspection-and-modification","history":"/api/acts/ad-emb-110-23-trim-tab-control-systems-inspection-and-modification/history","analysis":"/api/acts/ad-emb-110-23-trim-tab-control-systems-inspection-and-modification/analysis","conflicts":"/api/acts/ad-emb-110-23-trim-tab-control-systems-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-emb-110-23-trim-tab-control-systems-inspection-and-modification/important-cases","documents":"/api/acts/ad-emb-110-23-trim-tab-control-systems-inspection-and-modification/documents"}}