{"id":"F2006B01806","name":"AD/A109/21 - Aircruiser Emergency Floats","slug":"ad-a109-21-aircruiser-emergency-floats","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41004,"registerId":"commonwealth-F2006B01806-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A109/21 - Aircruiser Emergency Floats","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 3/1994,Rotorcraft,Agusta A109 Series Helicopters,Aircruiser Emergency Floats,21\ntitle: Airworthiness Directive - AD/A109/21 - Aircruiser Emergency Floats\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)  Agusta A109 Series Helicopters\n\n \n\nAD/A109/21 Aircruiser Emergency Floats 3/94\n\nApplicability: All models fitted with emergency floats P/N 109-0715-01 not modified in accordance with Aircruiser Service Bulletin 902-25-1.\n\n \n\nRequirement: Action in accordance with Agusta B.T. 109-93.\n\n \n\nNote: RAI AD 93-347 refers.\n\n \n\nCompliance: Prior to 30 September 1994.\n\n \n\nBackground: There has been an instance of uncommanded inflation of a float at high forward airspeed.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD's scope is confined to A109 helicopters fitted with a specific emergency float part number that have not been modified per Service Bulletin 902-25-1 and requires the actions in Agusta B.T. 109-93 to address a reported uncommanded inflation event. The stated scope aligns with the stated safety concern and does not expand beyond addressing that specific hardware and condition (Applicability; Requirement; Background)."},"complexity_factors":["Narrow technical scope: applies only to Agusta A109 helicopters with emergency float P/N 109-0715-01 not modified per SB 902-25-1 (Applicability).","External-document dependency: the AD requires action per Agusta B.T. 109-93 and references Service Bulletin 902-25-1 and RAI AD 93-347, so understanding/compliance requires obtaining those documents (Requirement; Note).","Fixed deadline: single clear compliance date (Compliance) simplifies scheduling but imposes time pressure.","Limited procedural detail in the AD itself: technical steps are in the referenced Agusta materials rather than in the AD text (Requirement), reducing procedural complexity in the AD but increasing dependence on external technical guidance."],"plain_english_summary":"This CASA airworthiness directive requires owners/operators of Agusta A109 helicopters fitted with emergency float P/N 109-0715-01 (unless already modified per Service Bulletin 902-25-1) to comply with Agusta B.T. 109-93 by 30 September 1994 to address a reported uncommanded float inflation.\n\nAffected operators must arrange and pay for the inspection/modification or retain evidence of prior SB 902-25-1 compliance; maintenance providers charge parts and labour."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect in specific helicopter models. It has not expanded beyond its original purpose of mandating a safety fix for uncommanded float inflation."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined term implicitly referenced (P/N 109-0715-01)","Single compliance requirement with external reference to Agusta B.T. 109-93","No nested conditional logic or exceptions","Simple binary applicability test (fitted with floats AND not modified per SB 902-25-1)","No cross-references to other legislation sections"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially 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 Agusta A109 helicopters to take corrective action on their emergency flotation systems. The emergency floats (part number 109-0715-01) can inflate unexpectedly during flight — which is dangerous at high speeds. The directive mandates compliance with Agusta technical bulletin 109-93 to fix this problem.\n\n**Who it affects:** Anyone operating Agusta A109 helicopters fitted with Aircruiser emergency floats that haven't been modified according to Service Bulletin 902-25-1.\n\n**Why it matters:** Uncommanded (unexpected) inflation of emergency floats at high speed could cause loss of control of the helicopter, potentially leading to a crash. This directive forces operators to fix the defect before a deadline (30 September 1994) to prevent accidents.\n\n**Key details:**\n- **The problem:** Floats can inflate without warning during flight\n- **The fix:** Follow Agusta technical bulletin 109-93\n- **The deadline:** Before 30 September 1994\n- **Related documents:** References an Italian aviation authority directive (RAI AD 93-347)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-21-aircruiser-emergency-floats","history":"/api/acts/ad-a109-21-aircruiser-emergency-floats/history","analysis":"/api/acts/ad-a109-21-aircruiser-emergency-floats/analysis","conflicts":"/api/acts/ad-a109-21-aircruiser-emergency-floats/conflicts","importantCases":"/api/acts/ad-a109-21-aircruiser-emergency-floats/important-cases","documents":"/api/acts/ad-a109-21-aircruiser-emergency-floats/documents"}}