{"id":"F2006B10217","name":"AD/GAF-N22/68 - Horizontal Stabiliser - Main Spar and Upper Skin","slug":"ad-gaf-n22-68-horizontal-stabiliser-main-spar-and-upper-skin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55875,"registerId":"commonwealth-F2006B10217-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/68 - Horizontal Stabiliser - Main Spar and Upper Skin","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-N22/68 Horizontal Stabiliser \\- Main Spar\n\nand Upper Skin\n\n  \n11/94\n\nApplicability: All Nomad N22 series and N24 series aircraft fitted with Mod N663 and N768.\n\nRequirement: Perform a detailed visual inspection of the horizontal stabiliser main spar and skins.\n\nInspect in accordance with Nomad Alert Service Bulletin ANMD-55-32.\n\nReport the findings of the first inspection, negative as well as positive, to the Authority. Include the total time in service of the horizontal stabiliser, and the time in service since mod’s N663 and N768 were fitted.\n\nCompliance: Initially inspect before 100 hours time in service after 13 October 1994, or before 13 November 1994, whichever occurs first.\n\nRe-inspect the spar and skins at each inspection of the airplane for the purpose of issuing a maintenance release, but not less frequently than annually, or every 115 hours time in service.\n\nBackground: Fatigue testing has revealed fatigue cracks in the horizontal stabiliser upper skin and main spar.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive with a narrow, specific purpose: addressing a known fatigue cracking issue in a particular aircraft type. It has not expanded beyond its original safety-critical intent."},"complexity_factors":["Single, specific applicability (two aircraft models with two specific modifications)","Clear, sequential compliance deadlines (initial + recurring)","Single inspection procedure referenced externally (Alert Service Bulletin ANMD-55-32)","Minimal defined terms (only standard aviation terms like 'time in service' and 'maintenance release')","No nested exceptions or conditional logic","Short document (approximately 200 words)"],"plain_english_summary":"This order requires owners/operators of Australian-made Nomad N22 and N24 aircraft fitted with Mod N663 and N768 to inspect the horizontal stabiliser for fatigue cracks in the main spar and upper skin.  \n\nIt mandates an early compliance inspection and regular checks (periodic maintenance or at least yearly/115 flight hours) with the first-inspection results reported to CASA. It addresses discovered fatigue that could cause tail structural failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies only to Nomad N22/N24 aircraft fitted with Mods N663 and N768 and mandates inspection, reporting and recurring checks to address fatigue cracks in the stabiliser (Background, Applicability, Requirement, Compliance). It does not broaden applicability beyond those aircraft or add other structural elements, so the scope has not changed from the measure's stated purpose."},"complexity_factors":["Applicability restricted to N22 and N24 aircraft fitted with Mod N663 and N768 — operators must identify affected airframes (Applicability).","Inspection procedures are defined by an external document (Nomad Alert Service Bulletin ANMD-55-32), so compliance requires accessing and following that bulletin (Requirement).","Initial compliance deadline has two alternative limits (100 hours after 13 Oct 1994 or by 13 Nov 1994), creating a short compliance window for operators (Compliance).","Recurring inspection schedule ties inspections to maintenance-release events and sets minimum frequencies (annually or every 115 hours), requiring ongoing tracking of time-in-service and maintenance cycles (Compliance).","Mandatory reporting of first-inspection findings (positive and negative) to the Authority creates an administrative obligation and a monitoring point (Requirement).","Operational interpretation issues (e.g. exact calculation of 'time in service' and what counts as a maintenance-release) may require operator procedures or regulator guidance, increasing implementation overhead."],"plain_english_summary":"Requires operators of GAF Nomad N22/N24 aircraft fitted with Mod N663 and N768 to carry out a detailed visual inspection of the horizontal stabiliser main spar and upper skin per Nomad Alert Service Bulletin ANMD-55-32, report the first-inspection results (positive and negative) to the Authority, and repeat inspections at each maintenance release but at least annually or every 115 hours. Initial inspection is due within 100 hours after 13 October 1994 or by 13 November 1994. The action follows fatigue testing that revealed cracks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-68-horizontal-stabiliser-main-spar-and-upper-skin","history":"/api/acts/ad-gaf-n22-68-horizontal-stabiliser-main-spar-and-upper-skin/history","analysis":"/api/acts/ad-gaf-n22-68-horizontal-stabiliser-main-spar-and-upper-skin/analysis","conflicts":"/api/acts/ad-gaf-n22-68-horizontal-stabiliser-main-spar-and-upper-skin/conflicts","importantCases":"/api/acts/ad-gaf-n22-68-horizontal-stabiliser-main-spar-and-upper-skin/important-cases","documents":"/api/acts/ad-gaf-n22-68-horizontal-stabiliser-main-spar-and-upper-skin/documents"}}