{"id":"F2006B10185","name":"AD/GAF-N22/39 Amdt 1 - Horizontal Stabiliser Pivot Bracket Attachment - Inspection and Modification","slug":"ad-gaf-n22-39-amdt-1-horizontal-stabiliser-pivot-bracket-attachment-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55841,"registerId":"commonwealth-F2006B10185-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/39 Amdt 1 - Horizontal Stabiliser Pivot Bracket Attachment - 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-N22/39\n\nAmdt 1\n\n\nHorizontal Stabiliser Pivot Bracket Attachment - Inspection and Modification\n\n\n9/80\n\n \n\nApplicability: All models N22, N22B, N22S, N24 and N24A.\n\n \n\nDocuments: GAF Telex Alert SB No. ANMD-55-13 dated 22 July 1980 and Revision to SB ANMD-55-13 dated 24 July 1980.\n\n \n\nCompliance: Unless already accomplished, within 120 hours time in service after 16 July 1980 or before 16 September, whichever occurs first.\n\n \n\nBackground: This amendment ‘A’ references GAF SB No. ANMD-55-13 as the requirement document which extends scope of inspection and provides detailed inspection instructions.\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":false,"description":"This amendment stays within the original scope of the Airworthiness Directive. It simply references the correct technical document (GAF SB ANMD-55-13) and clarifies that the inspection scope has been expanded with more detailed instructions. This is a typical administrative/technical amendment that refines rather than expands the directive's purpose."},"complexity_factors":["Very short document (approximately 200 words)","Only 5 defined aircraft models in applicability section","Single compliance requirement with clear time-based trigger (120 hours or fixed date)","No nested conditional logic or exceptions","Only 2 referenced technical documents (both versions of the same Service Bulletin)","Straightforward amendment note explaining the change from original AD"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific GAF aircraft models (the N22 and N24 series) to **inspect and modify the horizontal stabiliser pivot bracket attachment** — a critical structural component at the tail of the plane that helps keep the aircraft stable in flight.\n\n**Who it affects:** Anyone who owns or operates these specific GAF aircraft models: N22, N22B, N22S, N24, and N24A. These are Australian-designed utility aircraft commonly used for tasks like aerial surveying, parachuting, and cargo transport.\n\n**What must be done:** Aircraft must undergo the specified inspection and modification within **120 flight hours** after 16 July 1980, or before 16 September 1980 — whichever comes first. The work must follow the technical instructions in GAF Service Bulletin ANMD-55-13 (and its revision dated 24 July 1980).\n\n**Why it matters:** This amendment expands the original safety directive to include more detailed inspection instructions and a broader scope of inspection. The horizontal stabiliser is essential for flight control; if the pivot bracket attachment fails, the pilot could lose control of the aircraft. This AD prevents potential catastrophic accidents by catching structural problems before they cause failure.\n\n**Key point:** This is **Amendment 1**, meaning it updates an earlier version of the directive to make the safety requirements clearer and more comprehensive."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment ('A') alters the directive by explicitly referencing GAF Service Bulletin ANMD-55-13 (and its revision) as the mandatory requirement document and thereby \"extends scope of inspection\" and provides detailed inspection instructions via that bulletin. In other words, the amendment broadens the inspection scope compared with the original AD by making the expanded inspection and its detailed steps mandatory through the service bulletin. (See: \"Documents\", \"Background\".)"},"complexity_factors":["Dependence on external technical documents (GAF Telex Alert SB No. ANMD-55-13 and its revision) for the operative inspection/modification steps","Short, fixed compliance window (120 hours TIS from 16 July 1980 or before 16 September 1980) requiring prompt scheduling","Applies across multiple aircraft variants (N22, N22B, N22S, N24, N24A) which may have small technical differences","Mandates inspection and potential modification (not purely a reporting obligation), which can involve parts, labour and maintenance capability","Limited technical detail in the AD itself — implementation depends on clarity and availability of the referenced bulletin"],"plain_english_summary":"## What this directive does (mechanically)\n\nThis airworthiness directive (AD) requires operators of certain GAF aeroplanes to carry out an inspection and any required modification to the horizontal stabiliser pivot bracket attachment. The AD makes compliance with a manufacturer's service communication (GAF Telex Alert SB No. ANMD-55-13 and its 24 July 1980 revision) mandatory. The work must be done within 120 hours time in service after 16 July 1980 or before 16 September 1980, whichever is earlier. (See: \"Applicability\", \"Documents\", \"Compliance\".)\n\n## Who it affects\n\n- Owners and operators of GAF N22, N22B, N22S, N24 and N24A aircraft. (See: \"Applicability\")\n\n## Why it matters (official claim and the mechanics of implementation)\n\n- The AD references the manufacturer’s telex/service bulletin as the requirement document and says that the bulletin \"extends scope of inspection and provides detailed inspection instructions.\" The AD therefore changes regulatory status by making the manufacturer’s inspection/modification instructions mandatory for the listed aircraft. (See: \"Documents\", \"Background\")\n\n## Costs, incentives and compliance mechanics\n\n- Who pays: owners/operators must arrange and pay for the inspection and any modification called for by the service bulletin (the AD makes that bulletin mandatory). (See: \"Documents\", \"Compliance\".)\n\n- Timing and operational effect: operators must plan maintenance within the fixed compliance window (120 hours TIS from 16 July 1980 or before 16 September 1980). That creates a short scheduling window and potential aircraft downtime. (See: \"Compliance\".)\n\n- Information and implementation risk: the AD delegates technical detail to the referenced telex/service bulletin (ANMD-55-13 and its revision). The AD itself does not specify inspection steps; compliance depends on the content, clarity and practicability of that external document. (See: \"Documents\", \"Background\".)\n\n- Regulatory mechanism: the Director/authority has made the manufacturer’s bulletin a mandatory requirement through this AD rather than prescribing technical steps in the AD text itself. This concentrates the technical specification in an external manufacturer document that is now binding for affected operators. (See: \"Documents\", \"Background\".)\n\n## Trade-offs, burdens and potential effects on choice\n\n- The directive imposes a short-term compliance cost (inspection labour, possible parts and modification work, and aircraft out-of-service time) on a defined set of aircraft owners/operators. (See: \"Applicability\", \"Compliance\".)\n\n- The stated rationale is broader/extended inspection coverage and detailed inspection instructions provided by the bulletin. The trade-off presented by the AD is between that increased inspection scope (the stated safety/airworthiness aim) and the direct economic and scheduling costs to operators associated with meeting the mandatory requirement. (See: \"Documents\", \"Background\".)\n\n- The AD creates limited discretion for operators: the requirement is to follow the referenced bulletin within the timeframe. The AD itself does not set alternative compliance methods or waivers in the text provided. (See: \"Documents\", \"Compliance\".)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-39-amdt-1-horizontal-stabiliser-pivot-bracket-attachment-inspection-and-modification","history":"/api/acts/ad-gaf-n22-39-amdt-1-horizontal-stabiliser-pivot-bracket-attachment-inspection-and-modification/history","analysis":"/api/acts/ad-gaf-n22-39-amdt-1-horizontal-stabiliser-pivot-bracket-attachment-inspection-and-modification/analysis","conflicts":"/api/acts/ad-gaf-n22-39-amdt-1-horizontal-stabiliser-pivot-bracket-attachment-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-gaf-n22-39-amdt-1-horizontal-stabiliser-pivot-bracket-attachment-inspection-and-modification/important-cases","documents":"/api/acts/ad-gaf-n22-39-amdt-1-horizontal-stabiliser-pivot-bracket-attachment-inspection-and-modification/documents"}}