{"id":"F2006B05332","name":"AD/P166/6 - Fire Detection System - Modification","slug":"ad-p166-6-fire-detection-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45806,"registerId":"commonwealth-F2006B05332-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P166/6 - Fire Detection System - 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)  Piaggio P166 Series Aeroplanes\n\n \n\nAD/P166/6 Fire Detection System - Modification NK\n\nApplicability: All P166 series in transport category.\n\n \n\nRequirement: Replace the existing nacelle heat detector system by an approved fire detector system complying with the requirement of ANO Section 101.1.3.1, Issue 2, paragraph 2.4.\n\n \n\nCompliance: Forthwith.\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\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument, as published, imposes a replacement requirement for nacelle heat detectors on all Piaggio P166 transport-category aeroplanes and requires compliance forthwith. The provided text does not compare this directive to an earlier version or state a previous scope, so there is no information in the text to conclude the scope has changed from a prior instrument."},"complexity_factors":["Single, narrowly focused technical mandate (replace nacelle heat detector system) reduces legal complexity.","Reference to an external technical standard (ANO Section 101.1.3.1, Issue 2, para 2.4) increases operational complexity because compliance requires interpreting and applying that external provision.","Immediate compliance requirement (“Forthwith”) increases logistical and timing complexity for operators.","No detail in the AD on acceptable equipment, approval procedures, or cost allocation creates practical uncertainty and administrative complexity.","Applies to an entire fleet subset (“All P166 series in transport category”), concentrating implementation across multiple operators/owners."],"plain_english_summary":"This AD mandates immediate replacement of the nacelle heat detector on all Piaggio P166 transport‑category aeroplanes with an approved fire detector meeting ANO Section 101.1.3.1 (Issue 2, para 2.4). It applies to every affected aircraft and requires compliance “forthwith.”\n\nPractical effects: operators face immediate parts, installation, approval and scheduling work and potential downtime; the AD does not allocate costs, list acceptable systems, or explain the underlying safety rationale."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific technical modification for a specific aircraft type. It has not expanded beyond its original purpose of mandating fire detection system upgrades for the Piaggio P166 series."},"complexity_factors":["Extremely short document (under 150 words of substantive content)","Only 4 operative elements: applicability, requirement, compliance timing, and reference to external standard","Single cross-reference to external technical standard (ANO Section 101.1.3.1)","No defined terms section, no conditional logic, no exceptions","Straightforward imperative language ('Replace', 'Forthwith')","Narrow, specific applicability (single aircraft series, single system)"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft.\n\n**Who it affects:** Owners and operators of all **Piaggio P166 series aeroplanes** (a twin-engine aircraft originally designed in Italy) that are used in **transport category** operations (carrying passengers or cargo commercially, not just private flying).\n\n**What it requires:** The existing **nacelle heat detector system** must be replaced with an **approved fire detector system**. \n- The **nacelle** is the housing around the aircraft engine.\n- The current system only detects heat; the new system must meet stricter fire detection standards specified in **ANO Section 101.1.3.1, Issue 2, paragraph 2.4** (an older Australian aviation standard).\n\n**When it must be done:** **Forthwith** — meaning immediately, before the aircraft flies again.\n\n**Why it matters:** Heat detectors react too slowly to actual fires. This directive addresses a critical safety gap: engines can catch fire without generating enough heat to trigger a heat detector quickly enough to save the aircraft and occupants. The replacement with a proper fire detection system gives pilots earlier warning of engine fires, allowing time to shut down the engine, activate fire suppression, and land safely."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p166-6-fire-detection-system-modification","history":"/api/acts/ad-p166-6-fire-detection-system-modification/history","analysis":"/api/acts/ad-p166-6-fire-detection-system-modification/analysis","conflicts":"/api/acts/ad-p166-6-fire-detection-system-modification/conflicts","importantCases":"/api/acts/ad-p166-6-fire-detection-system-modification/important-cases","documents":"/api/acts/ad-p166-6-fire-detection-system-modification/documents"}}