{"id":"F2006B10491","name":"AD/HS 125/52 - Flap Outer Hinge Assembly - Inspection","slug":"ad-hs-125-52-flap-outer-hinge-assembly-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116245,"registerId":"commonwealth-F2006B10491-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/52 - Flap Outer Hinge Assembly - 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 125/52 Flap Outer Hinge Assembly - Inspection 8/78\n\nApplicability: All HS/DH/BH 125 series aeroplanes with modification 252670 embodied. Document:               Hawker Siddeley SB No. 57-55.\n\nCompliance: As per requirement document.\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\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":4,"scope_assessment":{"changed":false,"description":"The document does not indicate any change to scope beyond what is stated: it applies to all HS/DH/BH 125 series aeroplanes with modification 252670 embodied and requires inspection per Hawker Siddeley SB No. 57-55. No alteration to applicability or extension of scope is recorded in the text supplied."},"complexity_factors":["Reference to an external service bulletin (Hawker Siddeley SB No. 57-55) for all operational detail increases dependence on a separate document","Narrow and specific applicability (only HS/DH/BH 125 series with modification 252670) requires operators to check configuration records","Lack of on-face detail in the AD (no intervals, methods, or corrective actions stated) forces reliance on the service bulletin or operator/maintenance judgement","Regulatory formality (issued under Civil Aviation Regulations Part 39 - 105) creates formal compliance obligations despite minimal textual detail","Potential coordination needed between operators and maintenance organisations to interpret and implement the SB"],"plain_english_summary":"This airworthiness directive from the Civil Aviation Safety Authority requires owners/operators of HS/DH/BH 125 series aeroplanes with modification 252670 to carry out the flap outer hinge assembly inspection as specified in Hawker Siddeley Service Bulletin No. 57‑55. It creates a mandatory maintenance obligation enforced via the AD while deferring inspection methods, intervals and corrective actions to the cited service bulletin, imposing administrative and operational costs on operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on flap hinge inspections for one aircraft type. It represents the standard, narrow scope typical of individual ADs, which are designed to address specific safety concerns without expanding beyond their original technical purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section","Single, specific applicability criterion (modification 252670)","No conditional logic or nested exceptions","Simple cross-reference to external technical document (service bulletin) rather than internal legislative cross-referencing","Standardised AD format with minimal variation"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) that mandates safety inspections for specific British Aerospace aircraft.\n\n**What it does:**\n- Requires owners and operators of certain HS/DH/BH 125 series business jets to inspect the **flap outer hinge assembly** — a critical component that helps control the aircraft's wing flaps during takeoff and landing.\n- The directive references a specific manufacturer service bulletin (Hawker Siddeley SB No. 57-55) that contains the detailed inspection instructions.\n\n**Who it affects:**\n- Owners and operators of British Aerospace BAe 125 series aircraft that have **modification 252670** installed.\n- This includes aircraft originally manufactured by Hawker Siddeley, de Havilland, and British Aerospace (hence \"HS/DH/BH\" in the designation).\n\n**Why it matters:**\n- Flap hinge assemblies are subject to high stress during flight operations. Failures can compromise the pilot's ability to control the aircraft's lift and drag, particularly during critical phases like landing.\n- Airworthiness Directives are **legally binding safety orders**. Non-compliance can ground an aircraft and expose operators to regulatory penalties.\n\n**Compliance:**\n- Operators must follow the inspection schedule and procedures outlined in the referenced service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-52-flap-outer-hinge-assembly-inspection","history":"/api/acts/ad-hs-125-52-flap-outer-hinge-assembly-inspection/history","analysis":"/api/acts/ad-hs-125-52-flap-outer-hinge-assembly-inspection/analysis","conflicts":"/api/acts/ad-hs-125-52-flap-outer-hinge-assembly-inspection/conflicts","importantCases":"/api/acts/ad-hs-125-52-flap-outer-hinge-assembly-inspection/important-cases","documents":"/api/acts/ad-hs-125-52-flap-outer-hinge-assembly-inspection/documents"}}