{"id":"F2006B10691","name":"AD/HU 369/27 - Emergency Float Assemblies - Modification","slug":"ad-hu-369-27-emergency-float-assemblies-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116646,"registerId":"commonwealth-F2006B10691-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/27 - Emergency Float Assemblies - 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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters\n\n \n\nAD/HU 369/27 Emergency Float Assemblies - Modification 6/77\n\nApplicability: All models equipped with Hughes emergency float assemblies P/N 369H92036-1 and\n\n-2.\n\n \n\nDocument: 1. Hughes SIN HN-114; or\n\n \n\n2. FAA AD 77-09-01 amdt. 39-2882.\n\n \n\nCompliance: Before 1 August 1977.\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\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 from 1977 with a narrow, specific scope (modification of particular float assemblies). It has not expanded beyond its original purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined part numbers in applicability section","Single compliance requirement with binary document reference options","No nested conditional logic or exceptions","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Straightforward command structure: identify if affected → follow document 1 or 2 → complete by date"],"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 recall notice for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific McDonnell Douglas (formerly Hughes) and Kawasaki 369 series helicopters to modify their **emergency float assemblies** — the inflatable floats that deploy if a helicopter lands on water.\n\n**Who it affects:** Anyone operating these helicopter models that have Hughes emergency float assemblies with part numbers **369H92036-1 or 369H92036-2** installed.\n\n**What must be done:** Operators must follow the modification instructions in either:\n- Hughes Service Information Notice HN-114, **or**\n- The equivalent US Federal Aviation Administration directive (FAA AD 77-09-01)\n\n**Deadline:** The modification had to be completed **before 1 August 1977**.\n\n**Why it matters:** Emergency flotation systems are critical safety equipment for over-water operations. This directive addresses a specific defect or safety concern with these particular float assemblies to prevent potential failure during an emergency water landing."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD’s scope is explicit and confined to aircraft fitted with the specified Hughes emergency float assembly part numbers and prescribes compliance by a fixed date. The instrument does not contain amendments or language indicating a change from an earlier or different scope within the provided text; therefore the scope as stated appears consistent with the directive’s stated purpose (Applicability; Document; Compliance)."},"complexity_factors":["Narrow technical scope limited to a single set of part numbers (Applicability).","Clear, single compliance action referenced to external technical documents (Document).","Single fixed compliance deadline (Compliance).","Dependence on external documents for detailed technical steps increases practical complexity for implementers (Document).","Potential logistical complexity from parts and maintenance scheduling, not legal ambiguity (Compliance)."],"plain_english_summary":"What this instrument does (mechanics)\n\n- Requires modification of specified emergency float assemblies fitted to McDonnell Douglas (Hughes) and Kawasaki 369 series helicopters. The affected parts are Hughes emergency float assemblies P/N 369H92036-1 and P/N 369H92036-2 (Applicability).\n- Directs operators to carry out the work in accordance with either Hughes Service Instruction Notice HN-114 or FAA Airworthiness Directive 77-09-01 as amended (Document).\n- Sets a deadline for compliance: the required modification must be completed before 1 August 1977 (Compliance).\n\nWho this affects and who pays\n\n- Affects owners and operators of the listed helicopter models that have the specified Hughes emergency float assemblies installed (Applicability).\n- The operator or owner is the party that must arrange and pay for the modification, including obtaining the service instructions and carrying out maintenance or contracting maintenance providers (Document; Compliance).\n\nWhy it matters (stated purpose and verification of consequences)\n\n- The AD references manufacturer and FAA documents as the means of effecting the modification (Document). Those documents are the technical instructions for the required work; the AD itself makes compliance mandatory for affected aircraft.\n- The text does not state the underlying safety fault or failure mode that prompted the directive. The AD’s mechanism — mandating a modification by a fixed date — is a regulatory tool to remove or mitigate whatever condition the referenced documents address; determining the specific technical risk requires consulting the Hughes SIN HN-114 or FAA AD 77-09-01 (Document).\n\nPractical implications, trade-offs and implementation issues\n\n- Compliance burden: Operators must obtain the referenced service/AD documentation and schedule the modification with qualified maintenance personnel or facilities (Document). This creates direct costs (parts, labour) and use-of-aircraft downtime until the work is done (Document; Compliance).\n- Timing pressure: The AD sets a firm cut-off date (before 1 August 1977). A short compliance window concentrates demand for parts and maintenance slots and raises scheduling and availability risks for operators seeking to comply before the deadline (Compliance).\n- Discretion and enforcement: The Civil Aviation Safety Authority issues the AD and prescribes the compliance method by reference to external technical documents (Applicability; Document). The AD itself does not set alternative methods; any deviation would require separate approval from the regulator or an approved equivalent procedure (implied by the AD’s structure).\n- Market effects: The cost and time to comply are borne by aircraft owners/operators. Independent maintenance organisations can supply the modification work if authorised; the AD therefore creates demand for compliant maintenance services and for parts or kits specified in the referenced documents (Document). The AD does not directly alter ownership, airworthiness certification procedures beyond the compliance requirement, or contractual freedoms except by imposing a regulatory duty to modify (Applicability; Document; Compliance).\n\nConcrete behavioural change required\n\n- Operators must inspect their fleet for the specified part numbers and, where fitted, carry out the modification prescribed in the referenced Hughes or FAA document before the compliance date (Applicability; Document; Compliance).\n\nKey source citations\n\n- Applicability: “All models equipped with Hughes emergency float assemblies P/N 369H92036-1 and -2.”\n- Document: “1. Hughes SIN HN-114; or 2. FAA AD 77-09-01 amdt. 39-2882.”\n- Compliance: “Before 1 August 1977.”"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-27-emergency-float-assemblies-modification","history":"/api/acts/ad-hu-369-27-emergency-float-assemblies-modification/history","analysis":"/api/acts/ad-hu-369-27-emergency-float-assemblies-modification/analysis","conflicts":"/api/acts/ad-hu-369-27-emergency-float-assemblies-modification/conflicts","importantCases":"/api/acts/ad-hu-369-27-emergency-float-assemblies-modification/important-cases","documents":"/api/acts/ad-hu-369-27-emergency-float-assemblies-modification/documents"}}