{"id":"F2006B10492","name":"AD/HS 125/53 Amdt 2 - Flap Nose Ribs - Inspection","slug":"ad-hs-125-53-amdt-2-flap-nose-ribs-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116247,"registerId":"commonwealth-F2006B10492-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/53 Amdt 2 - Flap Nose Ribs - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  British Aerospace BAe 125 Series Aeroplanes\n\n \n\nAD/HS 125/53\n\nAmdt 2\n\n\nFlap Nose Ribs - Inspection 6/84\n\n \n\nApplicability: All models not incorporating mod 252772 (revised flap hinge arrangement), up to and including:\n\n \n\n700A: aircraft NA0311 plus NA0313, NA0323, NA0325, NA0326, NA0339.\n\n \n\n700B: aircraft 7163.\n\n \n\nDocument: British Aerospace 125 Series SB 57-58 Revision 4 dated 10 March 1984. Compliance:              As detailed in the requirement document.\n\nBackground:  This Directive has been amended to require compliance with the latest revision of the requirement document. It adds five aircraft previously omitted from the effectivity list.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment changes the AD’s scope in two ways: it requires compliance with the latest revision of the referenced service bulletin (SB 57-58 Revision 4) instead of an earlier edition, and it adds five aircraft that had been omitted from the original effectivity list. Both changes expand and update the set of aircraft and the technical standard to which operators must conform. (Background; Document; Applicability)"},"complexity_factors":["Relies on an external technical document (British Aerospace SB 57-58 Rev 4) for the detailed inspection requirements rather than containing procedures in the AD itself (Document; Compliance).","Applicability is conditional: only aircraft that have not incorporated modification 252772 are covered, requiring operators to check modification status for each airframe (Applicability).","Effectivity is specified by particular serial numbers for some subtypes, so applying the AD requires cross-referencing fleet serials (Applicability).","The AD updates the mandatory revision of the service bulletin, so compliance obligations can change over time as the referenced SB is revised (Background; Document).","The AD does not state inspection intervals, corrective actions, costs, or enforcement mechanics in-text; those operational details are in the referenced SB or in broader regulatory practice, adding practical complexity for implementers (Document; Compliance)."],"plain_english_summary":"This Airworthiness Directive updates mandatory inspections of flap nose ribs on BAe 125 series aeroplanes, requiring operators of affected aircraft (those without modification 252772 and specific serial numbers) to comply with British Aerospace SB 57-58 Revision 4 (10 Mar 1984). It matters because it enforces the latest service bulletin and adds five airframes to the regulated fleet, expanding who must carry out the referenced inspections and corrective actions."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly scoped to its original purpose — ensuring structural integrity of flap nose ribs on specific BAe 125 aircraft. The only change is the addition of five previously omitted aircraft serial numbers and updating the reference to the latest revision of the manufacturer's service bulletin. This is a minor administrative correction and update, not an expansion of scope."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 defined term implicitly referenced (mod 252772)","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Simple conditional logic: applies to specific aircraft models AND specific serial numbers AND excludes those with a specific modification","Single compliance requirement: follow the referenced service bulletin","No nested exceptions or complex procedural requirements in the directive itself (details deferred to external document)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific British Aerospace BAe 125 series aircraft.\n\n**What it does:**\n- Requires owners and operators of certain BAe 125 planes to inspect the **flap nose ribs** — structural components at the front edge of the wing flaps (the moving parts on the back of the wings that help control lift during takeoff and landing).\n\n**Who it affects:**\n- Owners and operators of BAe 125-700A and 700B model aircraft that **do not** have a specific modification (mod 252772) that changed the flap hinge design.\n- Specifically covers certain aircraft serial numbers that were previously left off the list — five additional planes have been added in this update.\n\n**Why it matters:**\n- Flap nose ribs can develop cracks or fatigue over time. If these structural parts fail, it could compromise the aircraft's ability to control lift safely during critical phases of flight (takeoff and landing).\n- This directive makes the inspection **legally mandatory** — operators must follow the procedures in British Aerospace Service Bulletin 57-58 (Revision 4, dated March 1984) to check these components.\n\n**Key change in this version:**\n- This is **Amendment 2**, which updates the directive to reference the latest version of the manufacturer's service bulletin and adds five previously omitted aircraft to the list of affected planes."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-53-amdt-2-flap-nose-ribs-inspection","history":"/api/acts/ad-hs-125-53-amdt-2-flap-nose-ribs-inspection/history","analysis":"/api/acts/ad-hs-125-53-amdt-2-flap-nose-ribs-inspection/analysis","conflicts":"/api/acts/ad-hs-125-53-amdt-2-flap-nose-ribs-inspection/conflicts","importantCases":"/api/acts/ad-hs-125-53-amdt-2-flap-nose-ribs-inspection/important-cases","documents":"/api/acts/ad-hs-125-53-amdt-2-flap-nose-ribs-inspection/documents"}}