{"id":"F2006B02384","name":"AD/AMD 50/18 - Frame 25 Water Drainage","slug":"ad-amd-50-18-frame-25-water-drainage","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41614,"registerId":"commonwealth-F2006B02384-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AMD 50/18 - 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 50/18 Frame 25 Water Drainage 13/99\n\nApplicability: MF 900 S/n 1 to 177 and F900 EX S/n 1 to 41.\n\n \n\nRequirement: Modify in accordance with Dassault Aviation SB MF900-232 or F900EX-093 as appropriate.\n\n \n\nNote: DGAC AD 1999-446-028(B) refers.\n\n \n\nCompliance: Before 30 June 2000.\n\n \n\nThis Airworthiness Directive becomes effective on 30 December 1999.\n\n \n\nBackground:  Manufacturer flight testing revealed that water does not drain properly through the Frame 25 filter and if it froze could lead to jamming of the flight controls.\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, time-bound safety directive with a single purpose: addressing a specific icing risk in specific aircraft. It has not expanded beyond its original technical scope."},"complexity_factors":["Single, specific technical requirement referencing external manufacturer documents","Narrow applicability limited to specific aircraft serial number ranges","Simple binary compliance structure (modify by deadline or don't)","No defined terms section, no conditional logic, no nested exceptions","Total length under 200 words","Single cross-reference to French aviation authority (DGAC) directive for context only"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority (CASA) for specific Dassault Falcon business jets.\n\n**What it does:**\nOrders owners and operators of certain Falcon 900 and Falcon 900EX aircraft to modify the water drainage system at \"Frame 25\" (a structural section of the fuselage). The fix must follow specific manufacturer service bulletins.\n\n**Why it matters:**\nFlight testing found that water could pool and freeze in the drainage filter at Frame 25. If ice formed there, it could jam the flight controls — a serious safety risk. This directive prevents potential loss of control incidents.\n\n**Who must comply:**\n- Owners/operators of Falcon 900 aircraft (serial numbers 1–177)\n- Owners/operators of Falcon 900EX aircraft (serial numbers 1–41)\n\n**Key deadlines:**\n- **Effective date:** 30 December 1999\n- **Compliance deadline:** Before 30 June 2000\n\n**What owners must do:**\nHave a mechanic modify the aircraft according to Dassault Aviation Service Bulletin MF900-232 (for standard Falcon 900s) or F900EX-093 (for the EX variant)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope is consistent with its stated purpose: it targets a defined set of Falcon 900/F900EX serial numbers and mandates a manufacturer-specified modification to address water drainage at Frame 25. The AD converts the manufacturer-identified safety issue into a compliance obligation with a set deadline (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow applicability limited to specific serial number ranges (Applicability).","Single, well-defined corrective action referencing a single manufacturer service bulletin (Requirement).","Clear compliance deadline (Compliance) and an effective date stated in the AD header.","Technical content is delegated to the manufacturer’s service bulletin rather than embedded in the AD (Requirement), reducing regulatory technical complexity but creating dependence on an external document.","Reference to a foreign authority AD (DGAC) as an informational note (Note)."],"plain_english_summary":"This AD requires owners/operators of specified Dassault Falcon 900 and F900EX airframes to install a manufacturer-prescribed modification to the Frame 25 drainage/filter (per Dassault service bulletin) to fix water pooling that could freeze and jam flight controls. Issued by CASA and effective 30 Dec 1999, the mandatory modification must be completed by 30 June 2000, creating a one‑time maintenance obligation and scheduling/cost burden for affected aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-amd-50-18-frame-25-water-drainage","history":"/api/acts/ad-amd-50-18-frame-25-water-drainage/history","analysis":"/api/acts/ad-amd-50-18-frame-25-water-drainage/analysis","conflicts":"/api/acts/ad-amd-50-18-frame-25-water-drainage/conflicts","importantCases":"/api/acts/ad-amd-50-18-frame-25-water-drainage/important-cases","documents":"/api/acts/ad-amd-50-18-frame-25-water-drainage/documents"}}