{"id":"F2006B04754","name":"AD/BN-2/43 - Engine Controls Attachment Brackets - Modification","slug":"ad-bn-2-43-engine-controls-attachment-brackets-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44518,"registerId":"commonwealth-F2006B04754-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BN-2/43 - Engine Controls Attachment Brackets - Modification","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)  Pilatus Britten-Norman BN-2 Series Aeroplanes\n\n \n\nAD/BN-2/43 Engine Controls Attachment Brackets - Modification\n\n\n5/79\n\n \n\nApplicability: All models.\n\n \n\nDocument: Britten Norman SB No. BN-2/SB.109, Issue 3. Compliance:  Within 100 hours time in service after 31 May 1979.\n\nBackground: To prevent partial loss of engine control due to fatigue failure of the engine control cables attachment brackets, the brackets are to be either reinforced if uncracked or replaced with improved brackets if cracked.\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 discrete, single-issue safety directive from 1979 addressing a specific mechanical defect. It has not expanded beyond its original narrow purpose of mandating bracket inspections and modifications for fatigue cracking."},"complexity_factors":["Extremely short document (approximately 150 words of substantive content)","Only one defined term implicitly referenced (the Service Bulletin number)","No nested conditional logic — simple binary condition (cracked vs uncracked)","Single cross-reference to external technical document (Britten Norman Service Bulletin No. BN-2/SB.109)","Clear, unambiguous compliance deadline with no exceptions or alternative compliance methods","No interpretation section, no definitions clause, no subordinate legislation references"],"plain_english_summary":"This is an **Airworthiness Directive** — 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 **Pilatus Britten-Norman BN-2 series aeroplanes** (commonly known as Islander aircraft) to inspect and fix a dangerous design flaw in the engine control system.\n\n**The problem:**\nThe brackets that hold the engine control cables can crack from metal fatigue. If they fail, pilots could lose partial control of the engines — a serious flight safety risk.\n\n**What must be done:**\n- **If the brackets are uncracked:** Reinforce them (strengthen the existing parts)\n- **If the brackets are cracked:** Replace them with improved, redesigned brackets\n\n**Who must comply:**\nAll operators of BN-2 series aircraft, regardless of specific model variant.\n\n**Deadline:**\nWithin 100 hours of flying time after 31 May 1979.\n\n**Why it matters:**\nThis directive prevents potentially catastrophic loss of engine control during flight. Compliance is legally mandatory — flying without making these modifications would violate civil aviation safety regulations."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive expands mandatory maintenance obligations for all BN‑2 models by requiring inspection and corrective action on the engine control cable attachment brackets within a defined 100‑hour window. This imposes a new, time‑constrained modification or replacement duty on aircraft operators where that duty did not previously appear in the text supplied. (Applicability; Compliance; Background)"},"complexity_factors":["Clear, single technical requirement (reinforce or replace brackets) reduces conceptual complexity (Background).","Short, specific compliance window (100 hours after 31 May 1979) simplifies timing but raises scheduling pressure (Compliance).","Applicability to all BN‑2 models broadens operational scope and increases administrative reach (Applicability).","Reliance on an external manufacturer service bulletin for technical implementation introduces dependency and potential variability in execution (Document).","Implementation requires an inspection judgment (cracked vs uncracked), creating limited discretionary decision points for maintenance staff (Background).","No parts, cost, or labour estimates provided increases practical uncertainty for operators arranging compliance (Document; Compliance)."],"plain_english_summary":"Requires BN‑2 series aircraft to have engine control cable attachment brackets inspected and either reinforced or replaced per Britten Norman SB BN‑2/SB.109 Issue 3 within 100 hours after 31 May 1979. Affects aircraft owners/operators and maintenance providers, who bear the costs; intended to prevent fatigue failure that could cause partial loss of engine control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-43-engine-controls-attachment-brackets-modification","history":"/api/acts/ad-bn-2-43-engine-controls-attachment-brackets-modification/history","analysis":"/api/acts/ad-bn-2-43-engine-controls-attachment-brackets-modification/analysis","conflicts":"/api/acts/ad-bn-2-43-engine-controls-attachment-brackets-modification/conflicts","importantCases":"/api/acts/ad-bn-2-43-engine-controls-attachment-brackets-modification/important-cases","documents":"/api/acts/ad-bn-2-43-engine-controls-attachment-brackets-modification/documents"}}