{"id":"F2006B03580","name":"AD/BEA 121/16 Amdt 1 - Fuselage/Mainplane Attachments","slug":"ad-bea-121-16-amdt-1-fuselage-mainplane-attachments","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43147,"registerId":"commonwealth-F2006B03580-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEA 121/16 Amdt 1 - Fuselage/Mainplane Attachments","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)  Beagle B121 (Pup) Series Aeroplanes\n\n \n\nAD/BEA 121/16\n\nAmdt 1\n\n\nFuselage/Mainplane Attachments 10/78\n\n \n\nApplicability: All B121 series 2 and 3 aircraft.\n\n \n\nRequirement: Action in accordance with British Aerospace Pup Service Bulletin No. B121/76. Compliance:               As detailed in the Requirement Document.\n\nNote: Role factors must be assessed by the manufacturer in accordance with appendices B and C of SB 121/76, and evidence of the assessment provided to the Secretary.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive format unchanged from original intent. It maintains the typical narrow scope of ADs: identifying a specific airworthiness concern (fuselage/mainplane attachments) for a specific aircraft type, and mandating compliance with manufacturer service bulletins. The amendment (Amdt 1) appears to be a routine update without expansion of scope."},"complexity_factors":["Extremely short document (under 200 words)","Only 1 defined applicability criterion (B121 series 2 and 3)","Single requirement referencing an external technical document (Service Bulletin B121/76)","No nested exceptions or conditional logic within the directive itself","No internal cross-references to other legislation or regulations","Compliance delegated entirely to external technical standard"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for **Beagle B121 (Pup) series aeroplanes** — specifically the Series 2 and 3 models.\n\n**What it does:**\n- Requires owners/operators to inspect and potentially repair the **fuselage/mainplane attachments** — the critical connection points where the wings attach to the aircraft body.\n- Mandates compliance with **British Aerospace Pup Service Bulletin No. B121/76**, which contains the specific technical instructions for the inspection and any necessary fixes.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains a Beagle B121 Series 2 or 3 aircraft in Australia.\n\n**Why it matters:**\n- Wing attachment points are **flight-critical** — if they fail, the wing can separate from the fuselage with catastrophic results.\n- This directive ensures these ageing aircraft (the Pup first flew in the 1960s) meet current safety standards for structural integrity.\n- The \"role factors\" note means the manufacturer must assess how the aircraft is being used (e.g., training, aerobatics, private flying) to determine appropriate inspection intervals and methods, with evidence filed with the Secretary (of the Department responsible for aviation)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The provided text sets applicability to all B121 series 2 and 3 aircraft and requires action per British Aerospace Pup Service Bulletin No. B121/76, with the manufacturer required to assess role factors per the bulletin appendices and provide evidence to the Secretary. The document does not state any prior scope or how this instrument alters an earlier instrument’s scope, so no change of scope is evident from the supplied text."},"complexity_factors":["Limited applicability (specific to Beagle B121 series 2 and 3) reduces scope but concentrates affected parties. (Applicability)","Substantive technical detail is contained in an external document (British Aerospace Pup Service Bulletin No. B121/76) rather than in the AD itself, requiring users to obtain and interpret that material. (Requirement; Compliance)","Manufacturer obligation to perform a role-factor assessment using appendices B and C of the service bulletin and to provide evidence to the Secretary creates an evidentiary and administrative step beyond on-aircraft work. (Note)","Compliance timing and tasks are delegated to the service bulletin's \"Requirement Document,\" leaving the AD itself spare on scheduling specifics. (Compliance)","Practical judgment by manufacturers and maintenance organisations in implementing inspections/repairs and assessments introduces operational discretion and potential variability in execution. (Requirement; Note)"],"plain_english_summary":"This AD makes compliance with British Aerospace Pup Service Bulletin No. B121/76 mandatory for all Beagle B121 series 2 and 3 aircraft, so owners/operators and maintenance organisations must carry out the inspections, repairs or mods specified there.  \n\nThe manufacturer must perform the SB’s role‑factor assessment (appendices B and C) and submit evidence to the Secretary. Operators/maintainers bear the direct compliance costs; the manufacturer bears the assessment and evidentiary burden."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bea-121-16-amdt-1-fuselage-mainplane-attachments","history":"/api/acts/ad-bea-121-16-amdt-1-fuselage-mainplane-attachments/history","analysis":"/api/acts/ad-bea-121-16-amdt-1-fuselage-mainplane-attachments/analysis","conflicts":"/api/acts/ad-bea-121-16-amdt-1-fuselage-mainplane-attachments/conflicts","importantCases":"/api/acts/ad-bea-121-16-amdt-1-fuselage-mainplane-attachments/important-cases","documents":"/api/acts/ad-bea-121-16-amdt-1-fuselage-mainplane-attachments/documents"}}