{"id":"F2006B10180","name":"AD/GAF-N22/33 - Rudder Structure and Trim Tab Control Rod - Inspection and Modification","slug":"ad-gaf-n22-33-rudder-structure-and-trim-tab-control-rod-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55825,"registerId":"commonwealth-F2006B10180-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/33 - Rudder Structure and Trim Tab Control Rod - 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)  GAF N22 and N24 Series Aeroplanes\n\n \n\nAD/GAF-N22/33 Rudder Structure and Trim Tab Control\n\nRod - Inspection and Modification\n\n\n3/80\n\n \n\nApplicability: All N22 and N24 series with S/Nos. listed in GAF Alert SB No. ANMD-55-11. Document:               GAF Alert SB No. ANMD-55-11.\n\nCompliance: As per requirement document.\n\n \n\nBackground:  The manufacturer has received reports of partial failure of an intercostal member and chafing of the trim tab control rod 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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument, as presented, applies to GAF N22 and N24 series aircraft with serial numbers listed in GAF Alert SB No. ANMD-55-11 and requires compliance with that SB. The text does not indicate any change of scope from an earlier or original intent within the provided material; it simply directs operators to follow the referenced service bulletin in response to manufacturer reports of partial intercostal member failure and trim tab control rod chafing (Applicability; Compliance; Background)."},"complexity_factors":["Directive is short and delegates all technical and procedural detail to an external service bulletin (Applicability; Compliance)","Applicability limited to aircraft with serial numbers listed in the external SB, requiring cross-reference to determine coverage (Applicability)","No timelines, cost allocations, or enforcement details included in the AD text, increasing administrative follow-up to determine obligations (Compliance)","Background identifies concrete failure modes but does not quantify frequency or risk, leaving risk management details to the SB (Background)","Dependence on an external document introduces document-access and interpretation steps for operators and maintainers"],"plain_english_summary":"What this instrument does mechanically\n\n- Requires the actions set out in GAF Alert Service Bulletin No. ANMD-55-11 for certain GAF N22 and N24 series aeroplanes (Applicability; Compliance). The directive identifies the affected aircraft by serial number in that service bulletin and directs compliance “as per requirement document” (Applicability; Compliance).\n\nOfficial rationale stated in the instrument\n\n- The manufacturer has reported in-service occurrences of partial failure of an intercostal member and chafing of the trim tab control rod. The directive points to the service bulletin as the requirement document created in response to those reports (Background).\n\nWho pays, who decides, and what changes in behaviour\n\n- Who pays: The directive text does not specify who bears the cost of inspection or modification (Applicability; Compliance).\n- Who decides: The Civil Aviation Safety Authority issued the airworthiness directive and delegates the technical steps to the GAF Alert SB No. ANMD-55-11; the directive makes that SB the operative requirement document (Applicability; Compliance).\n- Behavioural change required: Operators/owners of the serial-numbered N22/N24 aircraft listed in the referenced SB must carry out the inspections and modifications prescribed in that SB (Applicability; Compliance).\n\nImplementation, compliance and discretion\n\n- The AD is brief and does not set technical procedures, time limits, or cost allowances within its text; it relies on the external GAF Alert SB for those details (Applicability; Compliance). This means the practical compliance burden, time-in-service impacts, tooling or parts needs, and any follow-up reporting are defined by the SB rather than in the AD itself.\n- The AD does not state enforcement mechanisms, exemptions, or funding arrangements in the text provided (Compliance; Background).\n\nTrade-offs, incentives and practical effects (text‑based observation)\n\n- The directive’s stated purpose is to address specific structural failures and chafing reported by the manufacturer (Background). The instrument itself does not set out analysis of costs, alternatives, or a timetable; those elements are delegated to the referenced service bulletin (Applicability; Compliance).\n- Effects on private operators and maintenance providers are implied: affected aircraft must be inspected and, where required by the SB, modified. The AD text does not describe whether independent maintenance organisations, manufacturers, or operators will supply parts or perform the work, nor does it quantify disruption to operations (Applicability; Compliance).\n\nSummary takeaway\n\n- Mechanically, the AD makes compliance with GAF Alert SB No. ANMD-55-11 mandatory for the N22/N24 serial numbers listed in that SB. The stated reason is manufacturer reports of a partial failure and chafing of key rudder/trim components. The AD leaves technical, timing, and cost details to the referenced service bulletin; the AD text itself does not allocate costs or elaborate enforcement or exemption details (Applicability; Compliance; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific technical defect in specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","No defined terms section — relies entirely on external reference document","Single condition of applicability (specific serial numbers)","No nested exceptions or conditional logic","Simple structure: applicability, document reference, compliance, background","Technical content is delegated to external manufacturer bulletin (SB No. ANMD-55-11)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for specific GAF aircraft models.\n\n**What it does:**\n- Requires owners and operators of certain GAF N22 and N24 series aeroplanes to inspect and modify the rudder structure and trim tab control rod.\n- The directive references a manufacturer bulletin (GAF Alert SB No. ANMD-55-11) that contains the specific technical instructions.\n\n**Who it affects:**\n- Owners and operators of GAF N22 and N24 series aircraft with specific serial numbers listed in the referenced bulletin.\n\n**Why it matters:**\n- **Safety issue:** The manufacturer received reports of partial failure of an internal structural part (an \"intercostal member\" — a reinforcing piece between the aircraft's frame sections) and chafing (wear from rubbing) of the trim tab control rod.\n- **Risk:** These defects could affect aircraft control or structural integrity, potentially leading to loss of control.\n- **Legal requirement:** Compliance is mandatory under the Civil Aviation Regulations. Aircraft cannot legally fly until this work is done as specified."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-33-rudder-structure-and-trim-tab-control-rod-inspection-and-modification","history":"/api/acts/ad-gaf-n22-33-rudder-structure-and-trim-tab-control-rod-inspection-and-modification/history","analysis":"/api/acts/ad-gaf-n22-33-rudder-structure-and-trim-tab-control-rod-inspection-and-modification/analysis","conflicts":"/api/acts/ad-gaf-n22-33-rudder-structure-and-trim-tab-control-rod-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-gaf-n22-33-rudder-structure-and-trim-tab-control-rod-inspection-and-modification/important-cases","documents":"/api/acts/ad-gaf-n22-33-rudder-structure-and-trim-tab-control-rod-inspection-and-modification/documents"}}