{"id":"F2006B11441","name":"AD/P166/13 - Hydraulic Pressure Switch - Provision of Guards","slug":"ad-p166-13-hydraulic-pressure-switch-provision-of-guards","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57379,"registerId":"commonwealth-F2006B11441-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P166/13 - Hydraulic Pressure Switch - Provision of Guards","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/P166/13 Hydraulic Pressure Switch - Provision of Guards 9/61\n\nApplicability: S/Nos. prior to 376. Document: Piaggio SB P166-5. 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":2,"scope_assessment":{"changed":false,"description":"The AD, as supplied, defines a specific and limited scope: Piaggio P166 series aeroplanes with serial numbers prior to 376 must have guards fitted to the hydraulic pressure switch by following Piaggio SB P166-5, with compliance required forthwith. There is no information in the supplied text indicating a departure from that original scope."},"complexity_factors":["Narrow, serial-number-based applicability (S/Nos. prior to 376) requires operators to check aircraft records to determine whether the AD applies.","Reliance on an external technical document (Piaggio SB P166-5) for the method of compliance increases operational complexity because the AD itself contains no procedural detail.","Immediate compliance timeline (\"Forthwith\") shortens time available for planning and scheduling the work.","The AD text is terse and does not state costs, downtime, or enforcement mechanisms, forcing operators to seek that information elsewhere (service bulletin, maintenance providers, regulator)."],"plain_english_summary":"This AD requires owners/operators of Piaggio P.166 aeroplanes with serial numbers before 376 to fit guards to the hydraulic pressure switch immediately, directing compliance to Piaggio Service Bulletin P166‑5. Maintenance organisations performing the work must follow that SB.\n\nIt creates an immediate, owner‑borne obligation to modify affected airframes; the AD prescribes the outcome but delegates technical steps to the manufacturer’s document."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on hydraulic pressure switch guards for one aircraft type. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document — approximately 100 words of substantive content","No defined terms section","No cross-references to other legislation beyond a single service bulletin citation","No conditional logic or exceptions","Single, unambiguous compliance requirement: install guards on specific aircraft serial numbers","Standard AD format with only four elements: applicability, reference document, compliance requirement, and effective date"],"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) for specific aircraft.\n\n**What it does:** It requires owners or operators of certain Piaggio P166 series aeroplanes (specifically those with serial numbers before 376) to install protective guards around hydraulic pressure switches. This is to prevent damage or accidental interference with these switches.\n\n**Who it affects:** Anyone who owns, operates, or maintains Piaggio P166 aircraft with serial numbers prior to 376.\n\n**Why it matters:** Hydraulic pressure switches are critical safety components. If they get damaged or triggered accidentally, it could lead to hydraulic system failures with potentially serious consequences during flight. The directive makes compliance mandatory \"forthwith\" (immediately) — there's no grace period.\n\n**The technical basis:** The directive references Piaggio Service Bulletin P166-5, which contains the manufacturer's instructions for installing these guards."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p166-13-hydraulic-pressure-switch-provision-of-guards","history":"/api/acts/ad-p166-13-hydraulic-pressure-switch-provision-of-guards/history","analysis":"/api/acts/ad-p166-13-hydraulic-pressure-switch-provision-of-guards/analysis","conflicts":"/api/acts/ad-p166-13-hydraulic-pressure-switch-provision-of-guards/conflicts","importantCases":"/api/acts/ad-p166-13-hydraulic-pressure-switch-provision-of-guards/important-cases","documents":"/api/acts/ad-p166-13-hydraulic-pressure-switch-provision-of-guards/documents"}}