{"id":"F2006B10488","name":"AD/HS 125/49 Amdt 1 - Flap Outer Hinge Arm Assembly","slug":"ad-hs-125-49-amdt-1-flap-outer-hinge-arm-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116239,"registerId":"commonwealth-F2006B10488-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/49 Amdt 1 - Flap Outer Hinge Arm Assembly","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 125/49\n\nAmdt 1\n\n\nFlap Outer Hinge Arm Assembly 9/80\n\n \n\nApplicability: All HS/DH/BH 125 series aeroplanes except those with modification 252670 incorporated.\n\n \n\nDocument: British Aerospace 125 SB No 57-54, Rev 1.\n\n \n\nCompliance: Initially inspect before further flight (unless already accomplished) and thereafter inspect at intervals not exceeding 3 months.\n\n \n\nBackground:  The service bulletin revision supersedes the previous alert bulletin, it calls for the removal of the hinge arm for the inspection and applies to additional serial numbered aircraft.\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":3,"scope_assessment":{"changed":true,"description":"The amendment expands the coverage of the original alert bulletin to additional serial-numbered aircraft and supersedes the earlier bulletin; the Background states the service bulletin revision applies to additional serial numbers and calls for removal of the hinge arm for inspection (Background)."},"complexity_factors":["Single, clearly stated applicability with a single explicit exemption (modification 252670)","Simple, frequent inspection schedule (initial before next flight, then every 3 months)","Dependence on an external service bulletin (British Aerospace 125 SB No 57-54, Rev 1) for technical procedure increases operational detail but not legal complexity","Amendment extends applicability to additional serial numbers, requiring operators to check serial-number coverage","No multi-step compliance ladder, no conditional phased implementation, no additional administrative filings noted in the text"],"plain_english_summary":"This AD mandates inspection (and removal where required) of the flap outer hinge arm assembly on HS/DH/BH 125 series aeroplanes unless modification 252670 is fitted. It requires an initial inspection before the next flight (if not already done) and repeat checks every three months, using British Aerospace Service Bulletin No. 57-54 Rev 1 for procedures. It affects operators, owners and maintenance organisations and creates a recurring maintenance and downtime cost unless the modification has been incorporated."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This is Amendment 1 to an existing directive (AD/HS 125/49 originally issued 9/80). The scope has expanded from the original directive: the background explicitly states this revision 'applies to additional serial numbered aircraft' beyond the original coverage, and changes the inspection method from the previous 'alert bulletin' to require physical removal of the hinge arm rather than a less invasive check. This represents a significant expansion in both the population of affected aircraft and the stringency of the required maintenance action."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced (modification 252670)","No cross-references to other legislation or regulations beyond citation of parent Civil Aviation Regulations 1998","Simple conditional logic: applies to all aircraft in series EXCEPT those with specific modification","Clear, unambiguous compliance requirements with specific timeframes","Single technical reference document (British Aerospace Service Bulletin 57-54 Rev 1)","No nested exceptions or layered conditions"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on certain aircraft.\n\n**What it does:**\n- Orders owners and operators of **British Aerospace BAe 125 series aeroplanes** (also known as HS/DH/BH 125 series) to inspect the **flap outer hinge arm assembly** — a critical structural component that helps control the aircraft's flaps (the movable surfaces on the wings that help with takeoff and landing).\n\n**Who it affects:**\n- All operators of these aircraft **except** those that have already been modified with a specific factory update called \"modification 252670.\"\n\n**What must be done:**\n- **Immediate inspection** before the aircraft flies again (unless already done)\n- **Repeat inspections every 3 months** thereafter\n- The inspection requires **removing the hinge arm** from the aircraft to check it properly\n\n**Why it matters:**\n- This directive was updated (Amendment 1) because the manufacturer revised their service bulletin. The new requirements apply to more aircraft serial numbers than before and mandate physical removal of the part for inspection rather than just a visual check. This suggests potential safety concerns about cracks or failures in this component that could affect flight safety during critical phases like landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-49-amdt-1-flap-outer-hinge-arm-assembly","history":"/api/acts/ad-hs-125-49-amdt-1-flap-outer-hinge-arm-assembly/history","analysis":"/api/acts/ad-hs-125-49-amdt-1-flap-outer-hinge-arm-assembly/analysis","conflicts":"/api/acts/ad-hs-125-49-amdt-1-flap-outer-hinge-arm-assembly/conflicts","importantCases":"/api/acts/ad-hs-125-49-amdt-1-flap-outer-hinge-arm-assembly/important-cases","documents":"/api/acts/ad-hs-125-49-amdt-1-flap-outer-hinge-arm-assembly/documents"}}