{"id":"F2006B10766","name":"AD/HYD/1 - Sprague Engineering Hydraulic Accumulator - Modification","slug":"ad-hyd-1-sprague-engineering-hydraulic-accumulator-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56215,"registerId":"commonwealth-F2006B10766-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HYD/1 - Sprague Engineering Hydraulic Accumulator - 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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Hydraulic Equipment\n\n \n\nAD/HYD/1 Sprague Engineering Hydraulic NK Accumulator - Modification\n\n \n\nApplicability: All Sprague Engineering Accumulator assemblies P/N A-200-25 and A-200-50 not fitted with steel end caps.\n\n \n\nDocument: 1. Sprague Engineering Mod. Bulletin No. 2; or 2. FAA AD 70-10-4.\n\nCompliance: Components with 15,000 hours or more total time in service at 30 September 1970 - within the next 1000 hours time in service. Components with less than 15,000 hours total time in service at 30 September 1970 - before completing 16,000 hours total 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific manufacturer's component. It has not expanded beyond its original purpose of addressing a known defect in Sprague Engineering hydraulic accumulators. The scope remains tightly constrained to the specific part numbers and modification requirement originally identified."},"complexity_factors":["Very short document (under 200 words)","Only 2 defined part numbers in applicability section","Simple binary condition for compliance (steel end caps present or not)","Straightforward two-tier compliance deadline based on hours-in-service","No cross-references to other legislation beyond optional FAA AD reference","Single operational requirement (modification) with clear technical documents specified"],"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 as a \"recall notice\" for aircraft parts, but legally binding.\n\n**What it does:** It requires owners and operators to modify specific hydraulic accumulators made by Sprague Engineering. These are pressure storage devices used in aircraft hydraulic systems.\n\n**Who it affects:** Anyone operating aircraft with Sprague Engineering accumulator part numbers A-200-25 or A-200-50 — **but only if they don't already have steel end caps installed**.\n\n**What must be done:** The accumulators must be modified according to either:\n- Sprague Engineering Modification Bulletin No. 2, or  \n- FAA Airworthiness Directive 70-10-4 (the US equivalent safety order)\n\n**When it must be done:** The deadline depends on how much the part has been used:\n- **High-use accumulators** (15,000+ hours by 30 September 1970): Must be fixed within the next 1,000 hours of use\n- **Lower-use accumulators** (under 15,000 hours by 30 September 1970): Must be fixed before hitting 16,000 total hours of use\n\n**Why it matters:** This prevents potential catastrophic failure of hydraulic systems in flight. The original design apparently had a safety flaw (likely with non-steel end caps) that could cause the accumulator to rupture under pressure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text presents a single, narrowly tailored airworthiness directive that applies to specified Sprague accumulator part numbers lacking steel end caps and sets explicit compliance thresholds by hours-in-service. There is no material indication within this instrument that its scope has been expanded or narrowed relative to an earlier version; the directive itself defines the complete scope and deadlines. [Applicability; Compliance]"},"complexity_factors":["Narrow technical scope: only two part numbers and a single equipment feature (not fitted with steel end caps) are affected (lowers complexity). [Applicability]","External procedural dependency: compliance requires following Sprague Engineering Mod. Bulletin No. 2 or FAA AD 70-10-4, which are separate documents operators must obtain and interpret (raises complexity). [Document]","Time‑based thresholds tied to a historical cut‑off (15,000 hours as at 30 September 1970) and subsequent hour limits (next 1,000 hours or before 16,000 hours) add record-keeping and verification complexity. [Compliance]","Regulatory form is straightforward (an airworthiness directive) with clear applicability and deadlines, reducing legal ambiguity. [Header; Applicability; Compliance]"],"plain_english_summary":"This airworthiness directive mandates modification of Sprague Engineering hydraulic accumulator assemblies A-200-25 and A-200-50 when not fitted with steel end caps, using Sprague Mod. Bulletin No. 2 or FAA AD 70-10-4. It affects aircraft owners/operators and maintenance providers; owners must arrange and pay for the work. Compliance deadlines depend on each unit’s total time-in-service at 30 Sept 1970 (thresholds set at 15,000/16,000 hours)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hyd-1-sprague-engineering-hydraulic-accumulator-modification","history":"/api/acts/ad-hyd-1-sprague-engineering-hydraulic-accumulator-modification/history","analysis":"/api/acts/ad-hyd-1-sprague-engineering-hydraulic-accumulator-modification/analysis","conflicts":"/api/acts/ad-hyd-1-sprague-engineering-hydraulic-accumulator-modification/conflicts","importantCases":"/api/acts/ad-hyd-1-sprague-engineering-hydraulic-accumulator-modification/important-cases","documents":"/api/acts/ad-hyd-1-sprague-engineering-hydraulic-accumulator-modification/documents"}}