{"id":"F2006B10545","name":"AD/HS 748/11 - Nose Landing Gear Retraction Jack Bracket Mounting Bolts","slug":"ad-hs-748-11-nose-landing-gear-retraction-jack-bracket-mounting-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116353,"registerId":"commonwealth-F2006B10545-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 748/11 - Nose Landing Gear Retraction Jack Bracket Mounting Bolts","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 748/11 Nose Landing Gear Retraction Jack\n\nBracket Mounting Bolts\n\n\n2/95\n\n \n\nApplicability: All HS748 aircraft.\n\n \n\nRequirement: The nose landing gear retraction jack bracket mounting bolts are lifed items and shall be replaced in accordance with British Aerospace Mandatory Service Bulletin 53/16 Revision 3.\n\n \n\nNote: CAA (UK) AD 0115 refers.\n\n \n\nCompliance: Replace bolts before they achieve 3000 flights.\n\n \n\nBackground: Fatigue tests have shown that the nose landing gear retraction jack bracket mounting bolts are too highly loaded to attain a long fatigue life. Distortion of the bolts has been experienced on aircraft in service.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical failure mode in a single aircraft type. It has not expanded beyond its original purpose of mandating bolt replacement to prevent fatigue failure."},"complexity_factors":["Single, unambiguous operative requirement (bolt replacement)","Only one defined applicability criterion (all HS748 aircraft)","Single cross-reference to UK aviation authority directive (CAA AD 0115) and manufacturer service bulletin","No nested exceptions, conditional logic, or interpretive provisions","Extremely short document (under 200 words of substantive text)"],"plain_english_summary":"This is an **Airworthiness Directive** — a legally binding safety order issued by Australia's aviation safety regulator (CASA) for a specific aircraft type.\n\n**What it does:**\nOrders owners and operators of **British Aerospace HS 748 aircraft** to replace certain bolts on the nose landing gear before they reach 3,000 flights.\n\n**Why it matters:**\nFatigue testing and real-world experience showed these bolts are under too much stress and can distort or fail over time. If they break, the nose landing gear could malfunction — potentially causing a serious accident during takeoff or landing.\n\n**Who must comply:**\nAnyone operating an HS 748 aircraft in Australia. They must follow the specific replacement procedure set out in a British Aerospace technical bulletin (Service Bulletin 53/16 Revision 3).\n\n**Key requirement:**\n- Replace the **nose landing gear retraction jack bracket mounting bolts** before 3,000 flights are logged on them\n- Use the exact procedure from the manufacturer's mandatory service bulletin"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD imposes a specific maintenance requirement limited to all HS 748 aircraft: replacement of nose landing gear retraction jack bracket mounting bolts per British Aerospace Mandatory Service Bulletin 53/16 Revision 3 before 3,000 flights (Applicability; Requirement; Compliance). The text does not expand applicability beyond that aircraft type or beyond the described component life-limit, nor does it alter regulatory powers; it sets a targeted maintenance obligation consistent with addressing the stated fatigue concern (Background)."},"complexity_factors":["Narrow technical scope: applies only to a specific component on a single aircraft type (Applicability; Requirement).","Clear numeric life limit (3,000 flights) reduces interpretive ambiguity but requires accurate flight-count tracking (Compliance).","Mandatory reference to a manufacturer service bulletin concentrates technical detail outside the AD text, requiring operators to obtain and follow that document (Requirement).","Operational implementation depends on maintenance scheduling, parts availability and recordkeeping systems, which vary across operators.","Minimal regulatory discretion in the text, but practical compliance verification by inspectors introduces administrative steps."],"plain_english_summary":"This AD applies to all Hawker Siddeley HS 748s and requires operators to treat the nose-gear retraction jack bracket mounting bolts as lifed items and replace them per British Aerospace Mandatory Service Bulletin 53/16 Rev 3 before each bolt reaches 3,000 flights. Issued because fatigue testing and in-service distortion show limited bolt life, the rule forces recurring replacements, record‑keeping and parts/procurement burdens on operators, with associated maintenance cost and downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-748-11-nose-landing-gear-retraction-jack-bracket-mounting-bolts","history":"/api/acts/ad-hs-748-11-nose-landing-gear-retraction-jack-bracket-mounting-bolts/history","analysis":"/api/acts/ad-hs-748-11-nose-landing-gear-retraction-jack-bracket-mounting-bolts/analysis","conflicts":"/api/acts/ad-hs-748-11-nose-landing-gear-retraction-jack-bracket-mounting-bolts/conflicts","importantCases":"/api/acts/ad-hs-748-11-nose-landing-gear-retraction-jack-bracket-mounting-bolts/important-cases","documents":"/api/acts/ad-hs-748-11-nose-landing-gear-retraction-jack-bracket-mounting-bolts/documents"}}