{"id":"F2005L02420","name":"AD/BN-2/83 Amdt 1 - Horizontal Stabiliser Attachment Bolts","slug":"ad-bn-2-83-amdt-1-horizontal-stabiliser-attachment-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":36955,"registerId":"commonwealth-F2005L02420-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pilatus Britten-Norman BN-2 Series Aerop","sectionType":"division","heading":"Pilatus Britten-Norman BN-2 Series Aeroplanes","content":"### Pilatus Britten-Norman BN-2 Series Aeroplanes\n\n| AD/BN-2/83 Amdt 1 | Horizontal Stabiliser Attachment Bolts | 10/2005 |\n| ----------------- | -------------------------------------- | ------- |\n\n| Applicability: | Models BN2, BN2A, BN2B, BN2T, BN2T-4R, and BN2T-4S series islander aircraft.                                                                                                                                                                                                                                                                    |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect the horizontal stabiliser attachment bolts and anchor nuts in accordance with B-N Group Service Bulletin No. 302 Issue 1 or Issue 2, or later EASA approved revision.Incorporation of B-N Group Ltd Modification NB-M-1787 constitutes terminating action for the requirements of this Directive.Note: UK CAA AD G-2004-0014 R1 refers. |\n| Compliance:    | Unless the initial inspection is already accomplished, within 50 hours time in service or 2 months after 21 July 2004, whichever occurs first, and thereafter at intervals not to exceed 1,000 hours time in service; until incorporation of Mod. NB-M-1787.The compliance times remain unchanged by this issue.                                |\n|                | This Amendment becomes effective on 29 September 2005.                                                                                                                                                                                                                                                                                          |\n| Background:    | The manufacturer received several reports of loose horizontal stabiliser attachment bolts.Amendment 1 is issued in response to a revision of the related CAA AD, which introduces terminating action for the repetitive inspections.                                                                                                            |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n9 August 2005","sortOrder":0},{"sectionNumber":"AD/BN-2/83 Amdt 1","sectionType":"part","heading":"AD/BN-2/83 Amdt 1","content":"## AD/BN-2/83 Amdt 1","sortOrder":1},{"sectionNumber":"Horizontal Stabiliser Attachment Bolts","sectionType":"part","heading":"Horizontal Stabiliser Attachment Bolts","content":"## Horizontal Stabiliser Attachment Bolts","sortOrder":2},{"sectionNumber":"10/2005","sectionType":"part","heading":"10/2005","content":"## 10/2005","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: ensuring the structural integrity of horizontal stabiliser attachment bolts. The amendment simply adds a terminating action (the modification) to end the repetitive inspection requirement, which is a standard evolution of airworthiness directives without expanding scope."},"complexity_factors":["Single, specific mechanical issue (horizontal stabiliser bolts)","Only 6 aircraft models affected","Clear compliance timeline (50 hours/2 months initially, then 1,000 hour intervals)","Single terminating action available (Mod. NB-M-1787)","No nested exceptions or conditional logic","References only one external document (Service Bulletin No. 302) plus one related UK directive for context","Document is 1 page with minimal defined terms"],"plain_english_summary":"This CASA Airworthiness Directive requires inspection of the bolts attaching the horizontal stabiliser on specified Pilatus Britten‑Norman Islander models, per B‑N Service Bulletin No. 302, with an initial check within 50 flight hours or 2 months and repeat checks every 1,000 flight hours. It responds to reports of loose bolts that risk structural failure and loss of control; installing Mod. NB‑M‑1787 is prescribed as terminating (permanent) action. Compliance is mandatory for affected Australian‑registered aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 adds a terminating action: incorporation of B‑N Group Ltd Modification NB‑M‑1787 constitutes terminating action for the repetitive inspections. The amendment leaves the original compliance times unchanged but changes scope by permitting the modification to end the inspection cycle (Background/Requirement/Compliance)."},"complexity_factors":["Technical specificity: requires inspection of a particular component (horizontal stabiliser attachment bolts and anchor nuts) following a manufacturer service bulletin (Requirement).","Multiple models covered: six BN‑2 series variants listed in applicability, requiring fleet-level tracking.","Document cross-references: relies on B‑N Group Service Bulletin No.302 (Issue 1 or 2) or later EASA‑approved revisions and notes UK CAA AD G-2004-0014 R1 (Requirement/Note).","Time-based compliance windows: initial inspection within 50 hours TIS or two months after 21 July 2004 and repetitive inspections at intervals not to exceed 1,000 hours TIS (Compliance).","Terminating action dependency: incorporation of Modification NB‑M‑1787 removes the repetitive inspection obligation, requiring operators to track modification status (Requirement).","Regulatory provenance and effective date: issued by the Civil Aviation Safety Authority and effective 29 September 2005, relevant for enforcement and record-keeping (Compliance/Authority)."],"plain_english_summary":"This Directive requires operators of Pilatus Britten‑Norman BN‑2 Islander aircraft (BN2, BN2A, BN2B, BN2T, BN2T‑4R, BN2T‑4S) to inspect horizontal stabiliser attachment bolts and anchor nuts per B‑N Group Service Bulletin No.302 (Issue 1 or 2) or a later EASA‑approved revision; installing Modification NB‑M‑1787 ends the inspection requirement. Inspections are due within 50 hours time‑in‑service or two months after 21 July 2004 and then every 1,000 hours TIS until the mod is fitted; the Civil Aviation Safety Authority issued the AD (effective 29 Sep 2005) after reports of loose bolts."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-83-amdt-1-horizontal-stabiliser-attachment-bolts","history":"/api/acts/ad-bn-2-83-amdt-1-horizontal-stabiliser-attachment-bolts/history","analysis":"/api/acts/ad-bn-2-83-amdt-1-horizontal-stabiliser-attachment-bolts/analysis","conflicts":"/api/acts/ad-bn-2-83-amdt-1-horizontal-stabiliser-attachment-bolts/conflicts","importantCases":"/api/acts/ad-bn-2-83-amdt-1-horizontal-stabiliser-attachment-bolts/important-cases","documents":"/api/acts/ad-bn-2-83-amdt-1-horizontal-stabiliser-attachment-bolts/documents"}}