{"id":"F2006B11450","name":"AD/P166/23 - Main Landing Gear Jack Lock - Modification","slug":"ad-p166-23-main-landing-gear-jack-lock-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57397,"registerId":"commonwealth-F2006B11450-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P166/23 - Main Landing Gear Jack Lock - Modification","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 5/1963,Aircraft below 5700 kg,Piaggio P166 Series Aeroplanes,Main Landing Gear Jack Lock - Modification,23\ntitle: Airworthiness Directive - AD/P166/23 - Main Landing Gear Jack Lock - Modification\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/P166/23 Main Landing Gear Jack Lock - Modification 5/63\n\nApplicability: All models P166 and P166B. Document:  Piaggio SB P166-32.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD states its applicability as all Piaggio P166 and P166B models and mandates modification per Piaggio SB P166-32 with compliance required forthwith. The supplied text contains no statement that it narrows or broadens a prior scope or departs from an original intent; based on the document alone there is no indicated change to scope from any previously stated applicability."},"complexity_factors":["Narrow technical scope limited to a single aircraft component (main landing gear jack lock).","Mandatory, immediate compliance ('Forthwith') increases operational urgency despite lack of scheduling detail.","Technical method is outsourced by reference to an external document (Piaggio SB P166-32), requiring users to obtain and interpret that bulletin.","Key practical details are omitted from the AD text: cost allocation, who may perform the work, acceptance of alternatives, and record-keeping instructions.","Regulatory authority and applicability are clear (Part 39, all P166/P166B), reducing legal ambiguity about who is affected."],"plain_english_summary":"This Airworthiness Directive mandates an immediate modification to the main landing‑gear jack lock on all Piaggio P166 and P166B aeroplanes, to be carried out in accordance with Piaggio Service Bulletin P166‑32. It is compulsory and effective forthwith; the AD itself doesn’t describe the underlying hazard, cost allocation, or procedural details (who performs the work or acceptance of alternatives), so owners/operators must arrange and fund timely compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive. It addresses one specific mechanical issue on one aircraft type. There is no indication of scope creep — it does exactly what it says on the tin."},"complexity_factors":["Extremely short document — approximately 100 words of substantive content","No defined terms section","No cross-references to other legislation (only references manufacturer document SB P166-32)","No conditional logic or exceptions","Simple structure: applicability, document reference, compliance deadline only","Single, unambiguous command: modify the landing gear jack lock immediately"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority (CASA). An AD is a mandatory safety instruction — think of it as a \"recall notice\" for aircraft. It requires owners or operators to fix a specific safety problem.\n\n**What it does:** This directive orders a modification to the **main landing gear jack lock** on certain Piaggio aircraft. The jack lock is a mechanical device that holds the landing gear in place. The directive references a Service Bulletin (SB P166-32) from the manufacturer (Piaggio) that explains exactly what modification must be made.\n\n**Who it affects:** Anyone who owns or operates **Piaggio P166 and P166B model aircraft** — these are Italian-made twin-engine planes, often used for transport, surveillance, or utility work.\n\n**When it must be done:** **\"Forthwith\"** — meaning immediately, without delay. This suggests CASA considered the issue urgent.\n\n**Why it matters:** Landing gear failures can be catastrophic. A faulty jack lock could cause the landing gear to collapse or fail to deploy properly, endangering passengers, crew, and people on the ground. This directive ensures a known safety defect is fixed before it causes an accident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p166-23-main-landing-gear-jack-lock-modification","history":"/api/acts/ad-p166-23-main-landing-gear-jack-lock-modification/history","analysis":"/api/acts/ad-p166-23-main-landing-gear-jack-lock-modification/analysis","conflicts":"/api/acts/ad-p166-23-main-landing-gear-jack-lock-modification/conflicts","importantCases":"/api/acts/ad-p166-23-main-landing-gear-jack-lock-modification/important-cases","documents":"/api/acts/ad-p166-23-main-landing-gear-jack-lock-modification/documents"}}