{"id":"F2006B05317","name":"AD/P166/24 - Nose Landing Gear Retraction Jack Brake Valve - Modification","slug":"ad-p166-24-nose-landing-gear-retraction-jack-brake-valve-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45758,"registerId":"commonwealth-F2006B05317-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P166/24 - Nose Landing Gear Retraction Jack Brake Valve - 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/P166/24 Nose Landing Gear Retraction Jack\n\nBrake Valve - Modification\n\n\n5/63\n\n \n\nApplicability: All model P166. Document:  Piaggio SB P166-33. 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific mechanical component on a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document — only 5 substantive lines","No defined terms section","No cross-references to other legislation beyond the enabling regulation (CAR 1998 Part 39)","Single, unambiguous compliance requirement ('Forthwith')","No conditional logic, exceptions, or nested provisions","References only one external technical document (manufacturer's Service Bulletin)"],"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) for specific aircraft.\n\n**What it does:** It requires owners and operators of **Piaggio P166 series aeroplanes** (a type of twin-engine aircraft) to modify the **nose landing gear retraction jack brake valve**. This is a mechanical component that helps control how the front wheel folds up into the aircraft after takeoff.\n\n**Who it affects:** Anyone who owns, operates, or maintains a Piaggio P166 aircraft in Australia.\n\n**Why it matters:** The directive addresses a safety issue with this brake valve. Without the modification, there could be a malfunction in the nose gear system — potentially affecting the aircraft's ability to safely retract or extend its landing gear. The word **\"Forthwith\"** means this must be done **immediately** — not at the next scheduled maintenance check.\n\n**What needs to happen:** Operators must follow the manufacturer's Service Bulletin (Piaggio SB P166-33) to carry out the modification."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD text provided does not indicate any change of scope from the instrument’s stated purpose. It applies to all Piaggio P166 models, mandates modification per Piaggio SB P166-33, and requires compliance immediately. There is no text in the supplied instrument that narrows, widens or otherwise alters that scope."},"complexity_factors":["Single, discrete technical requirement (modification of one component) reduces complexity.","Immediate compliance (‘forthwith’) raises operational urgency and scheduling complexity for operators.","Reliance on an external technical document (Piaggio SB P166-33) delegates detailed procedures outside the AD text, requiring users to obtain and follow the manufacturer’s bulletin.","Technical skill and facilities are required to perform the modification correctly, creating practical complexity in execution.","No cost, timing window, or alternative methods are specified in the AD text, so operators must seek further information from the SB or regulator.","Regulatory authority under Part 39 creates binding legal effect; enforcement and record-keeping obligations add compliance overhead."],"plain_english_summary":"This Airworthiness Directive requires all Piaggio P166 aircraft to be modified—forthwith—to alter the nose landing‑gear retraction jack brake valve per Piaggio SB P166‑33. Owners/operators must arrange and fund the work; maintenance organisations must follow the service bulletin. CASA enforces the mandatory action; compliance will cause immediate downtime and maintenance cost."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p166-24-nose-landing-gear-retraction-jack-brake-valve-modification","history":"/api/acts/ad-p166-24-nose-landing-gear-retraction-jack-brake-valve-modification/history","analysis":"/api/acts/ad-p166-24-nose-landing-gear-retraction-jack-brake-valve-modification/analysis","conflicts":"/api/acts/ad-p166-24-nose-landing-gear-retraction-jack-brake-valve-modification/conflicts","importantCases":"/api/acts/ad-p166-24-nose-landing-gear-retraction-jack-brake-valve-modification/important-cases","documents":"/api/acts/ad-p166-24-nose-landing-gear-retraction-jack-brake-valve-modification/documents"}}