{"id":"F2006B10210","name":"AD/GAF-N22/61 Amdt 1 - Trim Tab Hinge","slug":"ad-gaf-n22-61-amdt-1-trim-tab-hinge","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55868,"registerId":"commonwealth-F2006B10210-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/61 Amdt 1 - Trim Tab Hinge","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nGAF N22 and N24 Series Aeroplanes\n\nAD/GAF-N22/61\n\nAmdt 1\n\n  \nTrim Tab Hinge 6/91\n\nApplicability: Nomad series aircraft with S/Nos N22S-159 to N22S-165 inclusive, incorporating Mod N663.\n\nRequirement: Action in accordance with ASTA Nomad Alert SB ANMD-55-25 Parts 1 and 2.\n\nCompliance: For Part 1. In accordance with initial issue of this Directive: Prior to exceeding 10 hours time in service after 6 June 1990.\n\nFor Part 2. In accordance with initial issue of this Directive: Prior to exceeding 200 hours time in service after 6 June 1990.\n\nThe effective date of this amendment is 13 June 1991.\n\nBackground: A condition may exist where the trim tab position of the horizontal stabilizers is incorrect, leading to a possibility of binding and overstress of the trim tab linkage with the stabilizer and trim setting at certain positions.\n\nThis Amendment is raised to introduce a Revision of the Requirement document, which issues the accomplishment instructions for Part 2; replacement of the trim tab hinge.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment stays tightly within the original scope of the airworthiness directive. It simply updates the technical instructions for Part 2 (hinge replacement) without expanding the applicability, adding new requirements, or changing the fundamental safety purpose. The original intent was to address a trim tab hinge defect; this amendment merely refines the implementation details."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined elements: specific aircraft serial numbers, modification number, and two compliance timeframes","Single technical requirement referencing an external service bulletin (SB ANMD-55-25)","No nested exceptions or conditional logic — just two sequential compliance deadlines","Clear applicability statement leaves no ambiguity about which aircraft are affected"],"plain_english_summary":"This airworthiness directive targets GAF Nomad N22/N24 aircraft (serials N22S-159–165) with Mod N663, requiring inspection and corrective action on the horizontal stabilizer trim tab hinge to prevent linkage binding and overstress. Compliance is mandatory: short‑term inspection and hinge replacement deadlines apply, and Amendment 1 supplies clarified instructions for performing the replacement."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment revises the requirement document that supplies accomplishment instructions for Part 2 (replacement of the trim tab hinge), changing the procedural detail implementers must follow. It does not broaden aircraft applicability or alter the stated compliance time limits (see 'This Amendment is raised...' and the 'Applicability' and 'Compliance' notes)."},"complexity_factors":["Narrow applicability to specific serial numbers creates straightforward scope but requires operators to check serial records (Applicability).","Mandates two actions (inspection; replacement where indicated) referenced to an external service bulletin, so compliance depends on accessing and following that document (Requirement).","Short, asymmetric compliance deadlines — 10 hours TIS for inspection; 200 hours TIS for replacement — can create scheduling pressure for operators and maintenance providers (Compliance).","Technical judgement and certified maintenance capability required to assess binding and to perform hinge replacement, generating a modest skills/parts burden for operators.","Amendment updates the requirement document governing Part 2 (replacement), so implementers must use the revised accomplishment instructions rather than earlier editions (Background).","Recordkeeping and evidence of compliance will be necessary for airworthiness records and inspections, imposing administrative tasks on owners/operators."],"plain_english_summary":"Requires inspection and, if needed, replacement of the horizontal‑stabiliser trim tab hinge on specific GAF Nomad aircraft (S/N N22S‑159 to N22S‑165) by following ASTA Nomad Alert SB ANMD‑55‑25 Parts 1 and 2. Operators must inspect within 10 hours TIS and complete any hinge replacement within 200 hours TIS after 6 June 1990 to address a reported risk of trim‑tab binding and overstress of the linkage."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-61-amdt-1-trim-tab-hinge","history":"/api/acts/ad-gaf-n22-61-amdt-1-trim-tab-hinge/history","analysis":"/api/acts/ad-gaf-n22-61-amdt-1-trim-tab-hinge/analysis","conflicts":"/api/acts/ad-gaf-n22-61-amdt-1-trim-tab-hinge/conflicts","importantCases":"/api/acts/ad-gaf-n22-61-amdt-1-trim-tab-hinge/important-cases","documents":"/api/acts/ad-gaf-n22-61-amdt-1-trim-tab-hinge/documents"}}