{"id":"F2006B05324","name":"AD/P166/30 - Nose Wheel Steering - Inspection and Modification","slug":"ad-p166-30-nose-wheel-steering-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45781,"registerId":"commonwealth-F2006B05324-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P166/30 - Nose Wheel Steering - Inspection and 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/P166/30 Nose Wheel Steering - Inspection and Modification 3/65\n\nApplicability: All models fitted with girder P/N 4105-033 which have accumulated more than 1600 hours time in service.\n\n \n\nRequirement: 1. Inspect the girder P/N 4105-033 in the area of the welds attaching the fixed pivot for the steering actuator.\n\n \n\n2. Replace girder P/N 4105-033 with a reinforced girder P/N 4105-016B or modify girder P/N 4105-033 in accordance with a scheme approved by the Secretary. Piaggio SB No. P166-44 refers.\n\n \n\nCompliance: For para. 1 - At intervals not exceeding 100 hours time in service until modified in accordance with para. 2.\n\n \n\nFor para. 2 - Within the next 500 hours time in service after 1 April 1965.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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 vintage Airworthiness Directive from 1965 (indicated by '3/65' in the reference number). It remains focused on its original narrow purpose: addressing a specific structural defect in a particular aircraft type's nose wheel steering system. The scope has not expanded beyond this specific safety issue."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined part numbers (P/N 4105-033 and P/N 4105-016B)","Simple conditional logic: applicability based on single threshold (1600 hours time in service)","Two straightforward compliance requirements with clear deadlines","Single cross-reference to manufacturer's service bulletin (Piaggio SB No. P166-44)","No nested exceptions or conditional sub-clauses"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nThis directive requires owners and operators of **Piaggio P166 series aeroplanes** (a type of Italian-made aircraft) to inspect and eventually replace or modify a specific part — the **nose wheel steering girder** (part number 4105-033).\n\n**Who it affects:**\n- Owners and operators of Piaggio P166 aircraft that have the specific girder part (P/N 4105-033)\n- Only applies to aircraft that have flown more than **1,600 hours** in total\n\n**What must be done:**\n1. **Repeated inspections:** Every 100 hours of flying time, inspect the welded area where the steering mechanism attaches to the girder. This continues until the modification is done.\n2. **Permanent fix:** Within 500 hours of flying time after **1 April 1965**, replace the old girder with a stronger one (P/N 4105-016B) OR modify the existing girder using a scheme approved by the Secretary (the government official responsible for aviation safety).\n\n**Why it matters:**\nThis directive addresses a potential **structural weakness** in the nose wheel steering system. The welded area could fail, potentially causing loss of steering control on the ground. The repeated inspections catch problems early, while the modification provides a permanent solution."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope is limited to aircraft fitted with girder P/N 4105‑033 that have exceeded 1,600 hours. It does not extend coverage to other parts or aircraft; it prescribes inspections and either replacement with P/N 4105‑016B or modification under an approved scheme (paras.1–2)."},"complexity_factors":["Narrow applicability tied to a specific part number and flight hours (girder P/N 4105‑033, >1,600 hours)","Technical inspection target limited to welds attaching fixed pivot for steering actuator","Two compliance tracks: recurring 100‑hour inspections until modified (para.1), and mandatory replacement/modification within 500 hours after 1 April 1965 (para.2)","Option to use an approved modification scheme introduces administrative approval by the Secretary","Reference to manufacturer service bulletin (Piaggio SB No. P166‑44) for modification guidance","Potential logistical factors: sourcing replacement part P/N 4105‑016B or arranging approved modification"],"plain_english_summary":"This airworthiness directive covers Piaggio P.166 aeroplanes fitted with nose‑wheel girder P/N 4105‑033 that have more than 1,600 hours. It requires owners/operators to inspect the weld area of the steering girder (para.1) and, within a set deadline, either replace it with reinforced girder P/N 4105‑016B or have it modified under an approved scheme (para.2).\n\nThe rule shifts recurring inspection and parts/rework costs to aircraft owners/operators, mandates 100‑hour inspection intervals until modification, and requires approval for alternative modification schemes, creating maintenance planning and compliance obligations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p166-30-nose-wheel-steering-inspection-and-modification","history":"/api/acts/ad-p166-30-nose-wheel-steering-inspection-and-modification/history","analysis":"/api/acts/ad-p166-30-nose-wheel-steering-inspection-and-modification/analysis","conflicts":"/api/acts/ad-p166-30-nose-wheel-steering-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-p166-30-nose-wheel-steering-inspection-and-modification/important-cases","documents":"/api/acts/ad-p166-30-nose-wheel-steering-inspection-and-modification/documents"}}