{"id":"F2006B10211","name":"AD/GAF-N22/62 Amdt 1 - Stub Fin","slug":"ad-gaf-n22-62-amdt-1-stub-fin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55869,"registerId":"commonwealth-F2006B10211-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/62 Amdt 1 - Stub Fin","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-N22/62\n\nAmdt 1\n\n  \nStub Fin 12/90 DM\n\nApplicability: All Nomad N22 and N24 Aircraft.\n\nRequirement: Action in accordance with Nomad Alert SB ANMD-53-12 Rev.1.\n\nCompliance: 1. For aircraft that have not complied with SB NMD-53-5 or have not incorporated modification N600A or N600B \\- Prior to exceeding 25 hours time in service after 26 September 1990, and thereafter at periods not exceeding 100 hours time in service.\n\n    2. For aircraft that have complied with SB NMD-53-5 or have incorporated modification N600A or N600B \\- Prior to exceeding 100 hours time in service after 26 September 1990, and thereafter at periods not exceeding 100 hours time in service.\n\n    3. For aircraft that have incorporated modification N663 \\- Prior to exceeding 100 hours time in service after 26 September 1990.\n\nNote: Deformed or cracked parts shall be repaired or replaced before further flight.\n\nBackground: A number of defects have been found involving the right hand stub fin spar cap, caused by horizontal stabiliser impact upon the lower stop. Defects in this area will cause a reduction in strength, and ability to carry design loads.\n\nAircraft incorporating SB NMD 53-5 (mod N600A & B) have increased strength in the area and allow later initial compliance.\n\nAircraft with modification N663 incorporated require one off inspection only.\n\nAmendment 1 references revised Requirement document, this relaxes the allowable damage limits and provides repair instructions.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 does not expand which aircraft are covered (all Nomad N22/N24 remain applicable) but changes the content of compliance: it relaxes allowable damage limits and provides repair instructions, so inspection acceptance criteria and repair methods have been amended rather than the population of affected aircraft (Amendment 1; Compliance)."},"complexity_factors":["Multiple compliance paths and differing initial inspection thresholds depending on prior SB NMD-53-5 and modifications N600A/N600B or N663 (Compliance)","External normative reference to Nomad Alert SB ANMD-53-12 Rev.1 which contains the technical inspection and repair procedures (Requirement)","Varying recurring inspection intervals (25 hours initial for some aircraft, 100 hours thereafter, or single inspection for N663) increasing tracking and scheduling burden (Compliance)","Mandatory repair-or-replace-before-flight requirement for deformed/cracked parts creates potential for aircraft downtime and parts/repair logistics (Note; Compliance)","Amendment 1 changes substantive acceptance criteria by relaxing allowable damage limits and adding repair instructions, altering how inspections are assessed (Amendment 1)","Enforcement under Civil Aviation Regulations requires operators to evidence compliance to CASA, implicating record-keeping and regulatory oversight (header/Applicability)"],"plain_english_summary":"This Airworthiness Directive mandates owners/operators of GAF Nomad N22 and N24 aeroplanes to inspect and, where necessary, repair or replace the stub fin spar cap in accordance with Nomad Alert SB ANMD-53-12 Rev.1. Inspection timing depends on whether earlier service bulletin SB NMD-53-5 or modifications N600A/B or N663 are fitted; damaged parts must be repaired or replaced before flight.\n\nThe measure targets defects from horizontal stabiliser impacts that reduce structural strength. Operators bear inspection and repair costs; the Civil Aviation Safety Authority enforces the directive. Amendment 1 relaxes allowable damage limits and supplies repair instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of addressing stub fin structural integrity. Amendment 1 merely updates the technical requirements document to relax damage limits and add repair instructions — it does not expand the applicability to new aircraft types or introduce new unrelated safety requirements."},"complexity_factors":["Multiple conditional compliance paths based on aircraft modification history (3 distinct categories)","Cross-references to external technical documents (Service Bulletins SB ANMD-53-12 Rev.1, SB NMD-53-5, and modifications N600A, N600B, N663)","Time-based compliance calculations tied to a specific historical date (26 September 1990)","Technical aviation terminology requiring domain knowledge (spar cap, horizontal stabiliser, stub fin, time in service)","Amendment structure requires reading original directive plus amendment to understand full requirements"],"plain_english_summary":"This AD applies to GAF Nomad N22/N24 aircraft and requires inspections and repairs to the tail stub fin because the right-hand stub fin spar cap can crack or deform if the horizontal stabiliser strikes its lower stop, weakening structure and risking loss of control. \n\nInspection intervals vary by existing modifications; any cracked or bent parts must be repaired or replaced before flight. Amendment 1 allows slightly greater damage tolerance and provides approved repair instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-62-amdt-1-stub-fin","history":"/api/acts/ad-gaf-n22-62-amdt-1-stub-fin/history","analysis":"/api/acts/ad-gaf-n22-62-amdt-1-stub-fin/analysis","conflicts":"/api/acts/ad-gaf-n22-62-amdt-1-stub-fin/conflicts","importantCases":"/api/acts/ad-gaf-n22-62-amdt-1-stub-fin/important-cases","documents":"/api/acts/ad-gaf-n22-62-amdt-1-stub-fin/documents"}}