{"id":"F2006B04721","name":"AD/BN-2/1 Amdt 1 - Pilot and Passenger Seat Cushion Supports - Inspection","slug":"ad-bn-2-1-amdt-1-pilot-and-passenger-seat-cushion-supports-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44485,"registerId":"commonwealth-F2006B04721-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BN-2/1 Amdt 1 - Pilot and Passenger Seat Cushion Supports - Inspection","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-2/1\n\nAmdt 1\n\n\nPilot and Passenger Seat Cushion NK Supports - Inspection\n\n \n\nApplicability: All models not incorporating Modification NB/M/238 or NB/M/295. Document:  Britten-Norman SB No. BN-2/SB 5 Issue 4.\n\nCompliance: At intervals not exceeding 100 hours time in service after 1 April 1969.\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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument is marked as Amendment 1 to AD/BN‑2/1 (Amdt 1), indicating it modifies an earlier version of the same airworthiness directive. The text provided does not specify what textual or substantive changes were made from the original AD, only the current applicability, document reference and compliance interval."},"complexity_factors":["Narrow and specific subject matter (seat cushion supports) limits scope.","Applicability carve‑out keyed to two specific modification identifiers (NB/M/238, NB/M/295) requires record checks of aircraft modification status.","Mandates recurring action tied to flight hours (time‑in‑service) rather than calendar time, requiring operational tracking systems.","Relies on an external technical document (Britten‑Norman SB No. BN‑2/SB 5 Issue 4) for inspection procedure, creating dependence on availability and clarity of that bulletin.","Historic date reference (starts after 1 April 1969) may require verification of historical compliance records for older aircraft."],"plain_english_summary":"This directive requires operators of Pilatus Britten‑Norman BN‑2 aeroplanes (unless they’ve incorporated Mod NB/M/238 or NB/M/295) to carry out the manufacturer’s inspection of pilot and passenger seat‑cushion NK supports per Britten‑Norman SB No. BN‑2/SB 5 Issue 4 at intervals not exceeding 100 hours TIS (from 1 April 1969). It affects aircraft owners/operators and maintenance organisations; operators pay inspection and repair costs or may install one of the specified modifications to avoid recurring inspections."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical maintenance requirement focused on a specific aircraft component. As an Airworthiness Directive, it has always been targeted and specific. Amendment 1 appears to be a routine update rather than an expansion of scope."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","Zero defined terms within the document itself (relies on external aviation terminology)","Single, unambiguous compliance requirement (100-hour inspection interval)","No nested conditions, exceptions, or cross-references to other legislation sections","Simple applicability test (two specific modification numbers exempt the aircraft)","References only one external technical document (Service Bulletin) for procedural detail"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety instruction issued by the Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires regular inspections of the **pilot and passenger seat cushion supports** on certain **Pilatus Britten-Norman BN-2 series aeroplanes** (commonly known as Islander aircraft).\n\n**Who it affects:** \n- **Aircraft owners and operators** of BN-2 models that have **not** been modified with either Modification NB/M/238 or NB/M/295\n- **Maintenance engineers** who perform inspections on these aircraft\n\n**What must be done:**\n- Inspect the seat cushion supports at **intervals no longer than 100 hours of flight time** (\"time in service\")\n- This requirement started from **1 April 1969**\n- Follow the procedure in **Britten-Norman Service Bulletin BN-2/SB 5 Issue 4**\n\n**Why it matters:** Seat cushion supports can fail due to wear, fatigue, or damage. If they break during flight, seats could shift or collapse — potentially causing loss of control, injury, or worse. This AD ensures potential problems are caught before they become dangerous.\n\n**Key point:** This is **Amendment 1** (an updated version) of an existing directive, suggesting the original requirement has been revised based on new safety information or experience."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-1-amdt-1-pilot-and-passenger-seat-cushion-supports-inspection","history":"/api/acts/ad-bn-2-1-amdt-1-pilot-and-passenger-seat-cushion-supports-inspection/history","analysis":"/api/acts/ad-bn-2-1-amdt-1-pilot-and-passenger-seat-cushion-supports-inspection/analysis","conflicts":"/api/acts/ad-bn-2-1-amdt-1-pilot-and-passenger-seat-cushion-supports-inspection/conflicts","importantCases":"/api/acts/ad-bn-2-1-amdt-1-pilot-and-passenger-seat-cushion-supports-inspection/important-cases","documents":"/api/acts/ad-bn-2-1-amdt-1-pilot-and-passenger-seat-cushion-supports-inspection/documents"}}