{"id":"F2006B10324","name":"AD/GROB 115/5 - Sliding Canopy","slug":"ad-grob-115-5-sliding-canopy","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56080,"registerId":"commonwealth-F2006B10324-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GROB 115/5 - Sliding Canopy","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)  Grob G115 Series Aeroplanes\n\n \n\nAD/GROB 115/5 Sliding Canopy 11/94 DM\n\nApplicability: Model G 115C, G 115C2, G 115D, and G 115D2, with all serial numbers up to 82022.\n\n \n\nRequirement: Action in accordance with Grob Service Bulletin TM 1078-41.\n\n \n\nNote: LBA AD 94-217 Grob refers.\n\n \n\nCompliance: For SB Action 1: Prior to further flight after 17 August 1994.\n\n \n\nFor SB Action 2: Prior to 30 September 1994.\n\n \n\nNote: Compliance with Action 2 of Grob Service Bulletin TM 1078-41 cancels Action 1 of the Requirement Document.\n\n \n\nBackground:  During test flight it was found that the canopy guide rails could distort as a result of very high loads. In order to prevent damage, this Directive requires a reinforcement modification of the guide rails.\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 safety directive addressing a specific mechanical defect in specific aircraft models. It has not expanded beyond its original purpose of mandating canopy rail reinforcement."},"complexity_factors":["Very short document (approximately 200 words)","Only 4 defined models in applicability section","Single primary requirement referencing external technical document (Service Bulletin)","Simple two-part compliance schedule with clear deadline dates","No nested exceptions or conditional logic — only one cancellation note (Action 2 cancels Action 1)","No cross-references to other legislation beyond a single note referencing German aviation authority (LBA) directive"],"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). Think of it like a compulsory recall notice, but for aircraft instead of cars.\n\n**What it does:** It requires owners and operators of specific Grob G115 training aircraft to fix a dangerous design flaw in the **sliding canopy** (the cockpit roof that opens and closes). During testing, engineers discovered that the **guide rails** (the metal tracks the canopy slides on) could bend or warp under high stress. If this happened in flight, the canopy could fail — potentially injuring occupants or causing loss of cabin pressure.\n\n**Who must act:** Anyone who owns or operates these specific models:\n- Grob G 115C, G 115C2, G 115D, and G 115D2\n- With serial numbers up to 82022\n\n**What they must do:** Follow the instructions in **Grob Service Bulletin TM 1078-41**, which involves reinforcing (strengthening) the canopy guide rails.\n\n**When:**\n- **Action 1:** Before flying again after 17 August 1994\n- **Action 2:** Before 30 September 1994\n\n**Key detail:** If you complete Action 2, you don't need to do Action 1 — the second action cancels the first.\n\n**Why it matters:** This prevents structural failure of the cockpit canopy. Without this fix, pilots and passengers faced risk of canopy detachment or damage during high-load manoeuvres common in training flights."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive's scope is narrowly defined in the instrument: it applies to the listed G 115 variants with serial numbers up to 82022 and requires the reinforcement modification per Grob Service Bulletin TM 1078-41. The text shows no change or expansion of affected aircraft or requirements beyond that stated applicability and the two specified compliance actions."},"complexity_factors":["Narrow applicability: specific models and serial numbers (G 115C, G 115C2, G 115D, G 115D2, serials up to 82022) reduces scope and decision complexity.","Prescriptive compliance: mandates work 'in accordance with Grob Service Bulletin TM 1078-41', so technical detail is delegated to a single manufacturer document.","Two-tier compliance schedule: Action 1 (immediate: prior to further flight after 17 Aug 1994) and Action 2 (by 30 Sep 1994) with Action 2 cancelling Action 1 — adds a short sequencing requirement.","Operational burden on owner/operator: the owner/operator bears cost, labour and scheduling to implement the modification.","Regulatory enforcement: Civil Aviation Safety Authority mandatory AD with reference to LBA AD 94-217 imposes legal compliance rather than voluntary guidance.","Low discretion for maintainers/regulator: steps and deadlines are fixed; limited room for alternate means of compliance without formal approval."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Grob G 115C, G 115C2, G 115D and G 115D2 aeroplanes (serials up to 82022) to strengthen the sliding canopy guide rails by following Grob Service Bulletin TM 1078-41. Action 1 must be done before the next flight after 17 August 1994; Action 2 by 30 September 1994 (Action 2 supersedes Action 1). The stated purpose is to prevent guide‑rail distortion under very high loads. Compliance work and costs fall to the aircraft owner/operator; CASA enforces the directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-grob-115-5-sliding-canopy","history":"/api/acts/ad-grob-115-5-sliding-canopy/history","analysis":"/api/acts/ad-grob-115-5-sliding-canopy/analysis","conflicts":"/api/acts/ad-grob-115-5-sliding-canopy/conflicts","importantCases":"/api/acts/ad-grob-115-5-sliding-canopy/important-cases","documents":"/api/acts/ad-grob-115-5-sliding-canopy/documents"}}