{"id":"F2006B06646","name":"AD/ROCK-114/13 Amdt 1 - Vertical Stabiliser Forward Spar Attachment Structure","slug":"ad-rock-114-13-amdt-1-vertical-stabiliser-forward-spar-attachment-structure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48563,"registerId":"commonwealth-F2006B06646-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ROCK-114/13 Amdt 1 - Vertical Stabiliser Forward Spar Attachment Structure","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)  \nGulfstream (Rockwell) 114 Series Aeroplanes\n\nAD/ROCK-114/13\n\nAmdt 1\n\n  \n\nVertical Stabiliser Forward Spar Attachment Structure\n\n  \n3/88\n\nApplicability: Models 114 and 114A serial number 14001 to 14540.\n\nRequirement: 1. Inspect for cracks in the fuselage frame and the vertical fin attachment fitting as shown in Part I of Gulfstream Aerospace SB 114-23A.\n\nNote: This inspection requirement is unchanged from the previous issue of this Directive.\n\n2. Modify the vertical fin attachment in accordance with Part II of Gulfstream Aerospace SB 114-23A.\n\nNote: Simple AC 43.13 type repairs are not equivalent.\n\nCompliance: For Requirement Para 1: Within 10 hours time in service after 7 May 1987.\n\nFor Requirement Para 2: Before further flight if cracks are found. Otherwise not\n\nlater than 24 March 1989.\n\nBackground: Numerous reports have now been received of cracking in the vertical stabiliser forward spar attachment structure. The manufacturer has analysed the load paths through this critical area and determined that substantial reinforcement is required to prevent further cracking.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The directive preserves the prior inspection requirement (noted as unchanged) but adds a mandatory modification requirement (Part II of the manufacturer’s SB). That expands enforceable obligations on operators of affected serial numbers by moving from inspection-only to inspection plus required corrective modification, with specified compliance deadlines (Requirement Para 1 and Para 2)."},"complexity_factors":["Technical nature: structural inspection and modification of a critical aircraft attachment (vertical stabiliser forward spar).","Mandatory, short deadlines: inspection within 10 hours TIS after 7 May 1987; modification before further flight if cracks or by 24 March 1989 otherwise.","Conditional grounding risk: 'before further flight if cracks are found' can force immediate grounding and urgent repairs.","Scope limited by serial numbers (14001–14540), requiring operators to check fleet applicability precisely.","Reliance on manufacturer Service Bulletin Parts I & II for methods and standards; interpretation and availability of the SB affect compliance.","Explicit prohibition on simple AC 43.13 repairs increases compliance burden and requires certified/approved repair procedures.","Administrative clarity/ambiguity: wording like 'otherwise not later than 24 March 1989' creates a separate compliance path that must be tracked.","Cost allocation and operational impact: owners/operators pay for inspections/modifications, which may affect scheduling, downtime and maintenance contracts."],"plain_english_summary":"This airworthiness directive requires owners/operators of Gulfstream (Rockwell) 114 and 114A aeroplanes (serials 14001–14540) to inspect the vertical stabiliser forward spar attachment for cracks (Requirement Para 1) and to perform a specified modification from the manufacturer’s Service Bulletin Part II (Requirement Para 2). Inspections must be done within 10 hours TIS after 7 May 1987; modification is required before further flight if cracks are found, otherwise by 24 March 1989. Operators bear inspection/modification costs; simple AC 43.13 repairs are not acceptable."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment (Amdt 1) to an existing Airworthiness Directive, but the scope remains unchanged. The note explicitly states the inspection requirement is unchanged from the previous issue, and the modification requirement appears to be the original intent — addressing a known structural defect in a specific aircraft fleet."},"complexity_factors":["Single, specific aircraft type and serial number range (narrow applicability)","Only two requirements: inspection and modification","Clear compliance deadlines with simple conditions (cracks found vs not found)","No defined terms section or complex interpretation provisions","References only one technical document (Gulfstream SB 114-23A)","Minimal conditional logic (only one 'if/then' scenario regarding cracks)","Short document (approximately 200 words)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Gulfstream/Rockwell 114 and 114A aircraft (serials 14001–14540) to inspect the fuselage frame and vertical fin attachment for cracks and to install a specified reinforcement kit to strengthen the vertical fin attachment. \n\nInspections were required within 10 flight hours of 7 May 1987; aircraft found cracked are grounded until modified, and modification must be completed by 24 March 1989 to prevent possible in‑flight tail separation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rock-114-13-amdt-1-vertical-stabiliser-forward-spar-attachment-structure","history":"/api/acts/ad-rock-114-13-amdt-1-vertical-stabiliser-forward-spar-attachment-structure/history","analysis":"/api/acts/ad-rock-114-13-amdt-1-vertical-stabiliser-forward-spar-attachment-structure/analysis","conflicts":"/api/acts/ad-rock-114-13-amdt-1-vertical-stabiliser-forward-spar-attachment-structure/conflicts","importantCases":"/api/acts/ad-rock-114-13-amdt-1-vertical-stabiliser-forward-spar-attachment-structure/important-cases","documents":"/api/acts/ad-rock-114-13-amdt-1-vertical-stabiliser-forward-spar-attachment-structure/documents"}}