{"id":"F2006B10940","name":"AD/JETSTREAM/7 Amdt 2 - Main Landing Gear Hinge Fitting and Support Angle","slug":"ad-jetstream-7-amdt-2-main-landing-gear-hinge-fitting-and-support-angle","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56492,"registerId":"commonwealth-F2006B10940-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/7 Amdt 2 - Main Landing Gear Hinge Fitting and Support Angle","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBritish Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\nAD/JETSTREAM/7\n\nAmdt 2\n\n  \n\nMain Landing Gear Hinge Fitting and Support Angle\n\n  \n5/95\n\nApplicability: All Jetstream 3100 series aircraft with constructors numbers 601 to 695 inclusive, without Service Bulletin 57-JM 5218 incorporated.\n\nRequirement: Inspect in accordance with British Aerospace Service Bulletin (BAe SB) 32-A-JA 850127, Revision 2, dated 11 November 1994.\n\nCompliance: Initially inspect before exceeding 4000 component landings.\n\nRe-inspect at the intervals specified in BAe SB 32-A-JA 850127, Revision 2\\. The inspection requirements are unchanged by this Amendment.\n\nThis Amendment is effective from 27 April 1995.\n\nBackground: Cracks have been found at the MLG hinge fittings on the Jetstream fatigue test specimen. In addition, a number of cases of cracks have been reported by operators of earlier series versions of the Jetstream. Amendment 2 redefines the applicability and excludes aircraft incorporating Mod No JM5218 (SB 57-JM 5218 refers).","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 2 redefines and narrows the AD's scope: it applies to Jetstream 3100 aircraft with constructor numbers 601–695 inclusive that have not incorporated Mod No JM5218 (SB 57‑JM 5218). The inspection requirements themselves remain as specified in BAe SB 32‑A‑JA‑850127 Revision 2, with initial compliance before 4,000 component landings."},"complexity_factors":["Narrow applicability defined by constructor serial numbers and presence/absence of a specific modification (Mod JM5218)","Dependence on an external manufacturer document (BAe SB 32‑A‑JA‑850127 Rev 2) for inspection procedures and re‑inspection intervals","Compliance metric tied to component landings (4,000) requiring operators to track usage data","Technical nature of inspections (fatigue/crack detection) requiring specialised maintenance capability","Amendment alters applicability but leaves inspection mechanics unchanged, creating a conditional scope","Regulatory timing (effective date) and operator responsibility to implement inspections"],"plain_english_summary":"This airworthiness directive requires inspections of the main landing gear hinge fitting and support angle on British Aerospace Jetstream 3100 aircraft (constructor numbers 601–695) that have not incorporated Mod JM5218, following BAe Service Bulletin 32‑A‑JA‑850127 Revision 2. An initial inspection must be done before 4,000 component landings and repeat inspections at the intervals in the service bulletin. The measure responds to cracks found in fatigue testing and operator reports; Amendment 2 narrows applicability by excluding aircraft with Mod JM5218."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment slightly narrows the applicability by excluding aircraft with the JM5218 modification, but this is a technical refinement consistent with the original safety purpose. The core scope — preventing main landing gear failures through mandatory inspection — remains unchanged."},"complexity_factors":["Single, specific technical requirement (visual inspection per manufacturer bulletin)","Only 2 defined applicability criteria (constructor numbers and modification status)","Simple compliance timeline (before 4,000 landings, then recurring intervals)","No nested exceptions or conditional logic — one straightforward exemption (SB 57-JM 5218 incorporated)","Short document (under 200 words of substantive text)","No cross-references to other legislation beyond the cited service bulletin"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections of main landing gear hinge fittings and support angles on British Aerospace Jetstream 3100 aircraft (sn 601–695) unless the JM5218 factory modification is already installed. Owners/operators must inspect before 4,000 landings and repeat at intervals in BAe Service Bulletin 32-A-JA 850127 Rev 2. It addresses fatigue-crack discoveries that could lead to landing-gear failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-7-amdt-2-main-landing-gear-hinge-fitting-and-support-angle","history":"/api/acts/ad-jetstream-7-amdt-2-main-landing-gear-hinge-fitting-and-support-angle/history","analysis":"/api/acts/ad-jetstream-7-amdt-2-main-landing-gear-hinge-fitting-and-support-angle/analysis","conflicts":"/api/acts/ad-jetstream-7-amdt-2-main-landing-gear-hinge-fitting-and-support-angle/conflicts","importantCases":"/api/acts/ad-jetstream-7-amdt-2-main-landing-gear-hinge-fitting-and-support-angle/important-cases","documents":"/api/acts/ad-jetstream-7-amdt-2-main-landing-gear-hinge-fitting-and-support-angle/documents"}}