{"id":"F2006B10162","name":"AD/GAF-N22/16 Amdt 1 - Horizontal Stabiliser Rivets - Inspection","slug":"ad-gaf-n22-16-amdt-1-horizontal-stabiliser-rivets-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55772,"registerId":"commonwealth-F2006B10162-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/16 Amdt 1 - Horizontal Stabiliser Rivets - Inspection","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-N22/16\n\nAmdt 1\n\n\nHorizontal Stabiliser Rivets - Inspection 1/78\n\n \n\nApplicability: All models N22 with S/Nos. N22-2, N22-3, N22-4, N22-8, N22-9, N22-17, N22-24, N22B-5, N22B-6, N22B-7, N22B-11, N22B-12, N22B-13, N22B-15, N22B-16, N22B-18 to N22B-23, N22B-25 to N22B-28 and N222-31.\n\n \n\nAll models N24 with S/Nos. N24-30, N24-32 and N24-34.\n\n \n\nDocument: GAF Alert SB No. AN22-55-3, Rev. 1.\n\n \n\nCompliance: Unless already accomplished, before further flight, and there-after at intervals not exceeding 100 hours time in service until modified.\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":3,"scope_assessment":{"changed":true,"description":"The instrument is labelled as Amendment 1 to AD/GAF-N22/16 (Amdt 1), indicating it amends a prior airworthiness directive. The provided text does not include the original AD or a redline of what was changed, so the precise nature of the change cannot be determined from the material supplied. The current text specifies applicability to a defined set of N22 and N24 serial numbers, references GAF Alert SB No. AN22-55-3, Rev. 1 for procedure, and sets timing as \"before further flight\" and then at intervals not exceeding 100 hours until modified (Applicability; Document; Compliance)."},"complexity_factors":["Narrow and specific applicability: list of precise serial numbers limits who is affected but requires checking individual aircraft records (Applicability).","Dependence on an external service bulletin for procedural detail, rather than including steps in the AD text (Document).","A conditional termination phrase \"until modified\" creates an ongoing requirement unless a qualifying modification is performed; the AD does not itself describe the terminating modification (Compliance).","Immediate operational constraint from the \"before further flight\" requirement creates time‑sensitive compliance obligations (Compliance).","Simple compliance interval (every 100 hours) reduces procedural complexity but imposes recurring administrative and maintenance scheduling."],"plain_english_summary":"What this instrument does, mechanically:\n\n- It orders a mandatory inspection of the horizontal stabiliser rivets on specific GAF N22 and N24 series aeroplanes listed by serial number. (Applicability)\n- The inspections must be carried out in the way set out in GAF Alert Service Bulletin No. AN22-55-3, Revision 1. (Document)\n- The timing requirement is: inspect before the next flight if not already done, and then repeat the inspection at intervals not exceeding 100 hours time in service, continuing that routine \"until modified\". (Compliance)\n\nWho it affects:\n\n- Owners and operators of the specific N22 and N24 aircraft listed in the Applicability section are required to have the inspections done. (Applicability)\n- Maintenance organisations or technicians who perform the inspections must follow the procedures set out in the referenced GAF Alert SB. (Document)\n- The Civil Aviation Safety Authority is the regulatory origin of the requirement under the Civil Aviation Regulations framework. (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY)\n\nWhy it matters (official purpose-claim and operational implications):\n\n- The AD is issued under the heading \"Horizontal Stabiliser Rivets - Inspection\" and, by its terms, requires immediate and recurring inspections of those rivets on the listed airframes. The AD itself presents the inspection requirement as the corrective measure; it does not include explanatory background or incident history in the text provided. (Title; Compliance)\n\nPractical consequences, trade-offs and incentives (tested against the instrument's mechanics):\n\n- Who pays and bears the burden: operators/owners of the listed aircraft must fund and schedule the initial and recurring inspections (labour, possible parts and any downtime). This follows from the Applicability and the Compliance timing. (Applicability; Compliance)\n- Operational disruption risk: because the inspection is required \"before further flight\" if not already done, an affected aeroplane may be unable to fly until the inspection is completed. That creates a near‑term operational cost (time, ferrying or grounding) for operators. (Compliance)\n- Recurring versus one‑off choice: the requirement continues at intervals not exceeding 100 hours until the aeroplane is \"modified\". That creates an ongoing maintenance burden unless and until a modification that removes the need for the recurring inspection is implemented. The text therefore creates an incentive for operators to pursue whatever modification the AD contemplates (not specified here) to remove the recurrent inspection. (Compliance)\n- Compliance detail and administrative friction: the AD points to an external document (GAF Alert SB No. AN22-55-3, Rev. 1) for the inspection procedure. Operators and maintenance providers must obtain and follow that SB to meet the AD; the AD itself does not set out the step‑by‑step procedure. This imposes a requirement to consult and apply the external service bulletin. (Document)\n- Concentration of costs and benefits: the cost burden falls directly and narrowly on owners/operators of the serial numbers listed. Maintenance providers may gain recurring work from operators while they carry the inspection workload. (Applicability; Compliance)\n- Regulatory certainty and discretion: the AD sets a clear mandatory requirement and timing; it does not, in the text provided, leave procedural discretion to operators beyond following the referenced SB. The AD is issued under the Civil Aviation Regulations framework (Part 39), which is the legal basis for mandatory airworthiness directives. (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY)\n\nWhat to watch for in implementation:\n\n- Operators should confirm the exact inspection method and any modification that terminates the recurring inspections by consulting the referenced GAF Alert SB No. AN22-55-3, Rev. 1. (Document)\n- Recordkeeping and scheduling will be required to show compliance with the \"before further flight\" and the 100‑hour repeat interval. (Compliance)\n\nSource references used in this summary: Applicability; Document: GAF Alert SB No. AN22-55-3, Rev. 1; Compliance; the header identifying the Civil Aviation Safety Authority and the Civil Aviation Regulations framework."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific safety purpose. It has not expanded beyond its original intent of addressing a particular structural defect in specific aircraft models."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 defined elements: applicability (specific aircraft models/serial numbers), reference document (GAF Alert SB No. AN22-55-3), and compliance deadline","Single straightforward requirement with no nested conditions or exceptions","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","Clear, unambiguous compliance instruction: inspect before flight, then every 100 hours until modified"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific GAF N22 and N24 series aircraft to inspect the rivets on their horizontal stabilisers (the small wing at the tail that keeps the plane level).\n\n**Who it affects:**\n- Owners and operators of specific GAF N22 and N24 aeroplanes with particular serial numbers listed in the document\n\n**What they must do:**\n- **Immediately:** Inspect the horizontal stabiliser rivets before the aircraft flies again\n- **Ongoing:** Repeat this inspection every 100 hours of flight time until a permanent modification is made to fix the problem\n\n**Why it matters:**\nFaulty rivets in the horizontal stabiliser could cause structural failure, potentially leading to loss of control of the aircraft. This directive forces operators to check for this specific safety defect and keep checking until it's permanently fixed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-16-amdt-1-horizontal-stabiliser-rivets-inspection","history":"/api/acts/ad-gaf-n22-16-amdt-1-horizontal-stabiliser-rivets-inspection/history","analysis":"/api/acts/ad-gaf-n22-16-amdt-1-horizontal-stabiliser-rivets-inspection/analysis","conflicts":"/api/acts/ad-gaf-n22-16-amdt-1-horizontal-stabiliser-rivets-inspection/conflicts","importantCases":"/api/acts/ad-gaf-n22-16-amdt-1-horizontal-stabiliser-rivets-inspection/important-cases","documents":"/api/acts/ad-gaf-n22-16-amdt-1-horizontal-stabiliser-rivets-inspection/documents"}}