{"id":"F2006B10558","name":"AD/HS 748/23 - Aileron Operating Arm Bracket","slug":"ad-hs-748-23-aileron-operating-arm-bracket","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116379,"registerId":"commonwealth-F2006B10558-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 748/23 - Aileron Operating Arm Bracket","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 (Hawker Siddeley) HS 748 Series Aeroplanes\n\n \n\nAD/HS 748/23 Aileron Operating Arm Bracket 5/98\n\nApplicability: All HS 748 aircraft.\n\n \n\nRequirement: Action in accordance with Jetstream Aircraft Mandatory Service Bulletin HS748-27- 124.\n\n \n\nNote: UK CAA AD 007-11-95 refers.\n\n \n\nCompliance: Unless the initial inspection is already accomplished; within 1,000 flying hours or 6 months after 23 April 1998, whichever occurs first; thereafter as specified in the requirement document.\n\n \n\nThis airworthiness directive becomes effective on 23 April 1998.\n\n \n\nBackground: Cracks have been found in the forward flanges of the aileron operating arm bracket assembly.\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive targeting a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of addressing cracks in the aileron operating arm bracket."},"complexity_factors":["Single, specific mechanical component targeted (aileron operating arm bracket)","Only one substantive requirement: comply with an external service bulletin","Simple compliance timeline (1,000 hours or 6 months, whichever first)","No defined terms section, no cross-references to other legislation beyond the parent regulations","No conditional exceptions or nested logic — applies to 'all HS 748 aircraft' without qualification","Total length: approximately 150 words"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of all **British Aerospace HS 748 series aircraft** to inspect and potentially repair a specific part — the **aileron operating arm bracket** (a component that helps control the plane's roll during flight).\n\n**Why it matters:**\nCracks have been discovered in this bracket. If left unchecked, this could lead to **aileron control failure** — meaning the pilot might lose the ability to bank or turn the aircraft properly, with potentially catastrophic consequences.\n\n**Who must act:**\nAnyone who owns, operates, or maintains an HS 748 aircraft in Australia.\n\n**What they must do:**\n- Follow the instructions in **Jetstream Aircraft Mandatory Service Bulletin HS748-27-124** (a technical repair notice from the manufacturer)\n- Complete the first inspection within **1,000 flying hours or 6 months** (whichever comes first) after 23 April 1998\n- Continue inspections as specified in that service bulletin\n\n**Key point:** This isn't optional. Airworthiness Directives are legally binding. You cannot fly the aircraft in compliance with Australian law until you meet these requirements."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to all HS 748 aircraft and mandates action in accordance with a named service bulletin. The text does not indicate an expansion or narrowing of applicability from a prior instrument; it establishes a mandatory inspection/repair requirement tied to a manufacturer-issued service bulletin in response to discovered cracks (Applicability; Requirement; Background)."},"complexity_factors":["Direct cross-reference to an external mandatory service bulletin for technical details (Requirement) increases dependency on a separate document.","Initial compliance contains a conditional exception (\"Unless the initial inspection is already accomplished\") that operators must check (Compliance).","Two-part timing requirement for initial inspection (1,000 flying hours or 6 months after 23 April 1998, whichever occurs first) imposes scheduling choices for operators (Compliance).","Ongoing inspection/repair intervals are not stated in the AD text but deferred to the service bulletin (\"thereafter as specified in the requirement document\"), creating operational reliance on the bulletin.","Cross-reference to a foreign authority's AD (UK CAA AD 007-11-95) introduces an additional source of related requirements or guidance (Note)."],"plain_english_summary":"The Civil Aviation Safety Authority requires owners and operators of British Aerospace (Hawker Siddeley) HS 748 aeroplanes to inspect the aileron operating arm bracket and carry out any corrective work per Jetstream Aircraft Mandatory Service Bulletin HS748‑27‑124, after cracks were found in the forward flanges creating an airworthiness concern.\n\nIf not already done, the initial inspection must be completed within 1,000 flying hours or six months after 23 April 1998; the service bulletin sets the inspection/repair details and subsequent intervals, and operators bear compliance costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-748-23-aileron-operating-arm-bracket","history":"/api/acts/ad-hs-748-23-aileron-operating-arm-bracket/history","analysis":"/api/acts/ad-hs-748-23-aileron-operating-arm-bracket/analysis","conflicts":"/api/acts/ad-hs-748-23-aileron-operating-arm-bracket/conflicts","importantCases":"/api/acts/ad-hs-748-23-aileron-operating-arm-bracket/important-cases","documents":"/api/acts/ad-hs-748-23-aileron-operating-arm-bracket/documents"}}