{"id":"F2006B04726","name":"AD/BN-2/15 - Tail Plane Front Spar Attachment - Inspection","slug":"ad-bn-2-15-tail-plane-front-spar-attachment-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44490,"registerId":"commonwealth-F2006B04726-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BN-2/15 - Tail Plane Front Spar Attachment - 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\n \n\n| AD/BN-2/15 | Tail Plane Front Spar Attachment - Inspection | NK |\n| --- | --- | --- |\n| Applicability: | All models not incorporating Mod. No. NB/M/404. |  |\n| Document: | Britten-Norman SB No. BN-2/SB.27. |  |\n\n\n \n\nCompliance: Within 100 hours time in service after 29 May 1970 and thereafter at intervals not exceeding 100 hours time in service.\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":false,"description":"The provided text sets applicability (excluding aircraft with Mod. No. NB/M/404), cites a specific service bulletin for procedure, and prescribes a repeating 100‑hour inspection interval. The text contains no amendment history or language indicating a change from an earlier scope; therefore there is no evidence in this instrument that the scope has changed from any prior intent."},"complexity_factors":["Narrow technical scope limited to the tail plane front spar attachment (low breadth).","Prescriptive, single compliance interval (100 hours) — simple timing rule.","Applicability exclusion based on a specific modification (Mod. No. NB/M/404) requires owners to check modification status.","Procedural details are externalised to Britten‑Norman SB No. BN‑2/SB.27, so operators must obtain and interpret a separate document.","No rationale or inspection detail included in the directive text increases implementation dependence on the service bulletin."],"plain_english_summary":"This AD requires BN‑2 series aeroplanes that have not had Mod. No. NB/M/404 fitted to inspect the tail‑plane front spar attachment per Britten‑Norman SB No. BN‑2/SB.27, first within 100 hours after 29 May 1970 and then every 100 hours. Owners/operators must comply and bear the recurring costs and downtime; installing Mod. NB/M/404 removes an aircraft from the requirement. The AD itself gives the schedule and reference but not the inspection steps or the safety justification."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific airframe component. It has not expanded beyond its original purpose of ensuring structural integrity of the tail plane attachment."},"complexity_factors":["Very short document — only 4 substantive data fields (applicability, document reference, compliance timing, and aircraft type)","Single condition for applicability (absence of one specific modification number)","Simple recurring obligation (inspect every 100 hours)","No defined terms section, no cross-references to other legislation beyond the enabling regulations, no nested exceptions","Clear reference to external technical document (Service Bulletin) for actual inspection procedures"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of **Pilatus Britten-Norman BN-2 series aircraft** (commonly known as Islander aircraft) to inspect the **tail plane front spar attachment** — a critical structural component that connects the horizontal tail to the fuselage.\n\n**Who must comply:** Anyone operating a BN-2 aircraft that **does not have Modification No. NB/M/404** installed. If your aircraft has this modification, you're exempt.\n\n**What you must do:**\n- **First inspection:** Within 100 hours of flying time after 29 May 1970\n- **Repeat inspections:** Every 100 hours of flying time thereafter\n\n**Why it matters:** The tail plane front spar attachment is essential for keeping the tail attached to the aircraft. Failure of this component could cause loss of control and crash. The directive references **Britten-Norman Service Bulletin BN-2/SB.27**, which contains the detailed inspection instructions.\n\n**In short:** If you fly one of these aircraft, you must check this specific bolt/attachment point roughly every 100 hours of flight time to ensure it isn't cracking or failing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-15-tail-plane-front-spar-attachment-inspection","history":"/api/acts/ad-bn-2-15-tail-plane-front-spar-attachment-inspection/history","analysis":"/api/acts/ad-bn-2-15-tail-plane-front-spar-attachment-inspection/analysis","conflicts":"/api/acts/ad-bn-2-15-tail-plane-front-spar-attachment-inspection/conflicts","importantCases":"/api/acts/ad-bn-2-15-tail-plane-front-spar-attachment-inspection/important-cases","documents":"/api/acts/ad-bn-2-15-tail-plane-front-spar-attachment-inspection/documents"}}