{"id":"F2006B05323","name":"AD/P166/3 - Fuel System in Engine Compartment - Modification","slug":"ad-p166-3-fuel-system-in-engine-compartment-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45778,"registerId":"commonwealth-F2006B05323-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P166/3 - Fuel System in Engine Compartment - 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/P166/3 Fuel System in Engine Compartment - Modification NK\n\nApplicability: S/Nos. prior to 362.\n\n \n\nDocument: Piaggio Change Order No. 66-3. Compliance: 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 supplied directive text does not indicate any change from an earlier or different scope. It defines its scope explicitly (Applicability: S/Nos. prior to 362) and requires compliance with the referenced Piaggio change order; no information in the supplied text suggests the scope has been changed from an original intent."},"complexity_factors":["Narrow applicability limited to Piaggio P166 aeroplanes with S/Ns prior to 362 (Applicability: S/Nos. prior to 362).","Required action is specified by reference to an external technical document (Piaggio Change Order No. 66-3) rather than described in detail in the AD (Document: Piaggio Change Order No. 66-3).","Immediate compliance required (Compliance: Forthwith), creating scheduling and operational urgency.","Directive text contains no explanatory material on safety rationale, cost allocation, or implementation logistics (absence of such details in supplied text)."],"plain_english_summary":"This airworthiness directive mandates an immediate modification to the engine‑compartment fuel system on Piaggio P.166 aeroplanes with serial numbers prior to 362, requiring compliance with Piaggio Change Order No. 66‑3. Owners and operators of those aircraft must carry out the specified change forthwith; the AD is a binding safety obligation listed in the Schedule of Airworthiness Directives."},"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 model. It has not expanded beyond its original purpose; it remains a narrow, single-issue airworthiness requirement."},"complexity_factors":["Extremely short document (under 150 words)","Only one defined applicability criterion (serial numbers prior to 362)","Single compliance action with no conditional exceptions or alternative methods","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No nested definitions or interpretive provisions","Straightforward command structure: identify affected aircraft → apply specific technical document → comply immediately"],"plain_english_summary":"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**What it does:**\n- Requires owners and operators of **Piaggio P166 series aeroplanes** (specifically those with serial numbers before 362) to modify the **fuel system in the engine compartment**.\n- The modification must follow **Piaggio Change Order No. 66-3** (the manufacturer's official technical instruction for this fix).\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains Piaggio P166 aircraft with serial numbers 1 through 361.\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety requirements. If you don't comply, you cannot legally fly the aircraft. This particular AD addresses a specific safety issue with the fuel system that could pose risks if left unmodified.\n- The word \"**Forthwith**\" means compliance is required **immediately** — there's no grace period or phased implementation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p166-3-fuel-system-in-engine-compartment-modification","history":"/api/acts/ad-p166-3-fuel-system-in-engine-compartment-modification/history","analysis":"/api/acts/ad-p166-3-fuel-system-in-engine-compartment-modification/analysis","conflicts":"/api/acts/ad-p166-3-fuel-system-in-engine-compartment-modification/conflicts","importantCases":"/api/acts/ad-p166-3-fuel-system-in-engine-compartment-modification/important-cases","documents":"/api/acts/ad-p166-3-fuel-system-in-engine-compartment-modification/documents"}}