{"id":"F2006B10198","name":"AD/GAF-N22/50 Amdt 2 - Fin Attachment Fittings","slug":"ad-gaf-n22-50-amdt-2-fin-attachment-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55856,"registerId":"commonwealth-F2006B10198-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/50 Amdt 2 - Fin Attachment Fittings","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-N22/50\n\nAmdt 2\n\n  \nFin Attachment Fittings 11/89\n\nApplicability: All Nomad N22 and N24 series aeroplanes which do not incorporate modification N602 together with either modification N600A or N600B.\n\nRequirement: 1. Action in accordance with ASTA Alert Service Bulletin ANMD-55-23, dated 27 June 1989.\n\n2. Action in accordance with GAF Service Bulletin NMD-53-5 and GAF Service Bulletin NMD-55-21.\n\nNote: Compliance with Requirement 2 constitutes terminating action for Requirement 1.\n\nCompliance: 1. Not later than the first issue of a Maintenance Release after 30 November 1989, unless Requirement 2 has been accomplished.\n\n2. Before exceeding 3000 hours component time in service.\n\nBackground: The original retirement life of 3000 hours was promulgated based on fatigue analysis. Recent service experience of pre-mod N331 aircraft has revealed that the original bolt P/N 2/N-00-43 may be susceptible to cracking before reaching 3000 hours component time in service. This Amendment calls up a bolt replacement as an interim alternative to incorporating modification N600A or N600B.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing Airworthiness Directive. It remains tightly focused on the original safety issue (fin attachment bolt fatigue) and does not expand beyond the specific aircraft models and components originally targeted. The amendment simply adds an interim compliance option (bolt replacement) while maintaining the original permanent modification pathway."},"complexity_factors":["Single, specific technical requirement with clear alternative compliance paths","Only 4 defined technical references (modification numbers and service bulletins)","Simple conditional logic: 'unless Requirement 2 has been accomplished'","No nested exceptions or cross-references to other legislation","Short, self-contained document (approximately 200 words)","Technical but straightforward aviation terminology"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of GAF Nomad N22/N24 aircraft (without factory mods N602+N600A/B) to address premature cracking of fin‑to‑fuselage attachment bolts that could lead to tail separation. Compliance is by either replacing the bolts under the specified service bulletin by the deadline or installing the permanent factory modifications, which also satisfies the requirement. The measure prevents catastrophic in‑flight failure by limiting bolt life well below the previously assumed safe hours."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment adds an interim bolt‑replacement requirement as an alternative to immediately fitting modifications N600A/N600B for certain pre‑mod aircraft, narrows applicability to Nomad N22/N24 without the cited mods, and sets specific compliance deadlines (Maintenance Release after 30 Nov 1989 or before 3000 component hours)."},"complexity_factors":["Conditional applicability: applies only to aircraft lacking modification N602 plus either N600A or N600B (Applicability).","Dual compliance paths: an interim bolt replacement (Requirement 1) or incorporation of listed GAF modifications (Requirement 2) with Requirement 2 as terminating action (Requirement/Note).","Component life tracking: compliance deadline tied to component time in service (3000 hours) (Compliance 2).","Action timing linked to the maintenance administration cycle (first Maintenance Release after 30 Nov 1989) rather than a calendar date for some aircraft (Compliance 1).","Dependence on multiple external documents (ASTA Alert Service Bulletin ANMD-55-23; GAF Service Bulletins NMD-53-5 and NMD-55-21) for the technical steps and parts (Requirement).","Specific part identification and fatigue risk: reference to original bolt P/N 2/N-00-43 and service experience prompting interim action (Background).","Operational burden on operators to schedule replacement or modification, source parts, and record component hours and maintenance releases (Requirements/Compliance)."],"plain_english_summary":"**What it does:** This airworthiness directive requires owners/operators of `Nomad N22/N24` aeroplanes that do not have modification N602 together with either N600A or N600B to replace a specific fin‑attachment bolt or install the listed GAF modifications; installing N600A/N600B removes the bolt requirement. It cites ASTA and GAF service bulletins. Operators pay for parts and maintenance. Compliance is by the first Maintenance Release after 30 Nov 1989 (unless mods done) or before 3000 component hours; CASA enforces compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-50-amdt-2-fin-attachment-fittings","history":"/api/acts/ad-gaf-n22-50-amdt-2-fin-attachment-fittings/history","analysis":"/api/acts/ad-gaf-n22-50-amdt-2-fin-attachment-fittings/analysis","conflicts":"/api/acts/ad-gaf-n22-50-amdt-2-fin-attachment-fittings/conflicts","importantCases":"/api/acts/ad-gaf-n22-50-amdt-2-fin-attachment-fittings/important-cases","documents":"/api/acts/ad-gaf-n22-50-amdt-2-fin-attachment-fittings/documents"}}