{"id":"F2006B06694","name":"AD/RYAN/3 - Front Fin Spar Attachment","slug":"ad-ryan-3-front-fin-spar-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114499,"registerId":"commonwealth-F2006B06694-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RYAN/3 - Front Fin Spar Attachment","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)  \nRyan ST Series Aeroplanes\n\nAD/RYAN/3 Front Fin Spar Attachment 13/99\n\nApplicability: Model ST-3KR aircraft, serial numbers 1001 through 2249.\n\nRequirement: Perform a detailed visual inspection of the front fin spar for cracks at its attachment to the fuselage.\n\nIf no cracks are found, and if the spar has been reinforced at the critical section by means of a wood plug pressed into the end of the spar, no further action is required.\n\nIf cracks are found, the spar should be repaired by cutting the spar member approximately 3.25 inches above the lower bend and splicing on, by means of 3/16- inch bolts, a 1.125 by 0.058-inch 4130 steel spar replacement section.\n\nNote 1: Ryan Service Bulletin 1044 covers the installation of the wood plug and Ryan Drawing SK-1879 covers the splice repair.\n\nNote 2: FAA AD 46-06-01 refers.\n\nCompliance: At the next periodic inspection after 30 December 1999, and thereafter at each periodic inspection.\n\nThis Airworthiness Directive becomes effective on 30 December 1999.\n\nBackground: The FAA requires on-going repetitive inspections of the front fin spar to fuselage attachment for cracking.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive (AD) — a targeted safety instrument addressing a specific structural defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspection and repair procedures for the Ryan ST-3KR front fin spar attachment."},"complexity_factors":["Single, specific aircraft model and serial number range (narrow applicability)","Straightforward conditional logic: two clear branches (cracks found / no cracks found)","Only 2 defined technical terms (fin spar, fuselage) — both explained by context","No cross-references to other legislation or complex regulatory frameworks","Simple compliance timeline (next periodic inspection, then recurring)","Contains only one substantive requirement with clear alternative outcomes","Length: approximately 150 words of operative text"],"plain_english_summary":"This safety order applies to Ryan ST-3KR aeroplanes (S/N 1001–2249). Owners/operators must inspect the front fin spar at its fuselage attachment for cracks at the next periodic inspection after 30 Dec 1999 and at every subsequent periodic inspection. If no cracks are found and a wood‑plug reinforcement is already installed, no further action is needed. If cracks are found, cut about 3.25 in above the lower bend and splice in a steel replacement section with the specified bolts. The measure addresses FAA-identified cracking that could cause loss of control."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive implements ongoing repetitive inspections and a prescriptive repair method consistent with the FAA background cited. It targets the same model/serial range and specifies inspection and repair actions without expanding the affected fleet or adding broader regulatory powers."},"complexity_factors":["Narrow applicability (single model and serial number range) reduces scope complexity.","Straightforward inspection requirement (detailed visual inspection) is procedurally simple.","Prescriptive repair specification (cut location, splice material/dimensions, bolt size) requires technical/engineering work but is narrowly defined.","References to external documents (Ryan Service Bulletin 1044, Drawing SK-1879, FAA AD 46-06-01) create dependency on other technical material for implementation.","Recurring compliance timing (at next and each periodic inspection) creates ongoing administrative tracking for operators."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Ryan ST‑3KR aeroplanes (serials 1001–2249) to carry out a detailed visual inspection of the front fin spar at its fuselage attachment at the next periodic inspection after 30 December 1999 and at every periodic inspection thereafter. If no cracks are found and a specified wood‑plug reinforcement is present, no further action is needed; if cracks are present, the spar must be cut and spliced with a specified 4130 steel replacement section using 3/16‑inch bolts. Costs and compliance duties fall to the aircraft owner/operator."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ryan-3-front-fin-spar-attachment","history":"/api/acts/ad-ryan-3-front-fin-spar-attachment/history","analysis":"/api/acts/ad-ryan-3-front-fin-spar-attachment/analysis","conflicts":"/api/acts/ad-ryan-3-front-fin-spar-attachment/conflicts","importantCases":"/api/acts/ad-ryan-3-front-fin-spar-attachment/important-cases","documents":"/api/acts/ad-ryan-3-front-fin-spar-attachment/documents"}}