{"id":"F2006B02401","name":"AD/AMD 50/5 - Aft Toilet and Frame 25 Water Drainage","slug":"ad-amd-50-5-aft-toilet-and-frame-25-water-drainage","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41644,"registerId":"commonwealth-F2006B02401-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AMD 50/5 - Aft Toilet and Frame 25 Water Drainage","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)  AMD Falcon 50 and 900 Series Aeroplanes\n\n \n\nAD/AMD 50/5 Aft Toilet and Frame 25 Water Drainage 2/91\n\nDM\n\n \n\nApplicability: All Model 900 Aircraft.\n\n \n\nRequirement: 1. Action in accordance with the technical requirement of DGAC AD 90-170-009 (B) Part 1.\n\n \n\n2. Action in accordance with the technical requirement of DGAC AD 90-170-009 (B) Part 2.\n\n \n\nNote: Dassault Aviation SB’s F900-57, F900-82 and F900-83 refer.\n\n \n\nCompliance: 1. Prior to 13 February 1991.\n\n \n\n2. Prior to 13 November 1991.\n\n \n\nBackground: This AD is raised in response to the Country of origin AD which requires checks and modifications designed to eliminate the accumulation of water in the area of box structures surrounding the flight controls at frame 25.\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, time-bound safety directive addressing a specific technical defect in a specific aircraft type. It has not expanded beyond its original purpose of ensuring water drainage modifications are completed on Falcon 900 aircraft."},"complexity_factors":["Very short document (under 300 words)","Only 2 substantive requirements with clear deadlines","Minimal defined terms (only standard aviation acronyms like AD, SB, DGAC)","No nested conditional logic or exceptions","Single cross-reference to French authority directive (DGAC AD) with explicit incorporation by reference","Straightforward applicability (all Model 900 aircraft — no sub-exceptions)"],"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, but legally binding.\n\n**What it does:** It requires owners and operators of **Dassault Falcon 900 series aircraft** to perform specific safety checks and modifications to fix a water drainage problem near the aft (rear) toilet.\n\n**The problem:** Water was accumulating in structural \"box sections\" around the flight controls at \"frame 25\" (a specific part of the aircraft's skeleton). Water in these areas can cause corrosion or freeze, potentially affecting flight control systems — a serious safety risk.\n\n**Who must act:** Anyone operating a Falcon 900 aircraft in Australia.\n\n**What they must do:**\n- **Part 1:** Complete specific checks and modifications before 13 February 1991\n- **Part 2:** Complete additional work before 13 November 1991\n\n**Why it matters:** Flight controls are what let pilots steer the aircraft. Water damage or freezing in these structures could lead to control problems. This AD ensures Australian-registered aircraft meet the same safety standards as those in France (the \"country of origin\"), where Dassault Aviation is based.\n\n**Key terms explained:**\n- **DGAC AD 90-170-009 (B):** The French aviation authority's original safety order that this Australian directive copies\n- **SB (Service Bulletins):** Manufacturer-issued technical instructions for fixes (F900-57, F900-82, F900-83)\n- **Frame 25:** A structural cross-member in the aircraft fuselage"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD adopts and enforces the requirements of the country-of-origin (DGAC) AD for the same technical issue. It applies to all Model 900 aircraft and sets two compliance deadlines; it does not expand the applicability or add requirements beyond the referenced DGAC AD and Dassault service bulletins."},"complexity_factors":["Cross-reference to an external (DGAC) airworthiness directive rather than full technical text in this instrument","Reference to multiple manufacturer service bulletins (Dassault SB F900-57, F900-82, F900-83) for procedural detail","Two separate mandated actions with different compliance deadlines (Part 1 and Part 2)","Technical work (inspection/modification of flight‑control area at frame 25) requiring maintenance/engineering resources and possible downtime","Applicability to an entire model fleet (all Model 900 aircraft) concentrates compliance obligations on operators"],"plain_english_summary":"This airworthiness directive requires operators of all Dassault Falcon Model 900 aircraft to carry out the checks and modifications set out in the French DGAC AD 90-170-009 (B) Parts 1 and 2 to stop water collecting around the box structures that surround the flight controls at frame 25. Part 1 work must be done before 13 February 1991 and Part 2 before 13 November 1991. The directive adopts the country-of-origin requirements and points to Dassault service bulletins for technical detail."}},"importantCases":[],"_links":{"self":"/api/acts/ad-amd-50-5-aft-toilet-and-frame-25-water-drainage","history":"/api/acts/ad-amd-50-5-aft-toilet-and-frame-25-water-drainage/history","analysis":"/api/acts/ad-amd-50-5-aft-toilet-and-frame-25-water-drainage/analysis","conflicts":"/api/acts/ad-amd-50-5-aft-toilet-and-frame-25-water-drainage/conflicts","importantCases":"/api/acts/ad-amd-50-5-aft-toilet-and-frame-25-water-drainage/important-cases","documents":"/api/acts/ad-amd-50-5-aft-toilet-and-frame-25-water-drainage/documents"}}