{"id":"F2006B05327","name":"AD/P166/33 - Engine and Propeller Teleflex Controls - Inspection and Modification","slug":"ad-p166-33-engine-and-propeller-teleflex-controls-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45790,"registerId":"commonwealth-F2006B05327-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P166/33 - Engine and Propeller Teleflex Controls - 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\n# AD/P166/33  Engine and Propeller Teleflex Controls - Inspection and Modification\n\nApplicability: All models P166, P166B and P166C incorporating Piaggio SB No. 166-51.\n\n# 1/68\n\n \n\nRequirement: 1. Inspect P/N 5206 swing bearings for security in the swinging joint terminal fitting P/N 6161.02, of all engine and propeller teleflex controls.\n\n \n\n2. Modify the joint and bearing of the engine and propeller controls in accordance with Piaggio SB No. 166-54.\n\n \n\nCompliance: For para. 1 - Within 25 hours time in service after 10 January, 1968 and thereafter at intervals not exceeding 25 hours time in service until modified as required in para. 2.\n\n \n\nFor para. 2 - Before 1 June, 1968.\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 discrete, time-bound safety directive from 1968 addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspection and modification of teleflex control bearings."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 substantive requirements (inspection and modification)","Single applicability criterion (aircraft model + service bulletin incorporation)","Clear, specific deadlines with no conditional exceptions","No defined terms section — uses standard aviation terminology (P/N, SB, time in service)","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1988, Part 39)"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**Who it affects:** Owners and operators of **Piaggio P166 series aircraft** (models P166, P166B, and P166C) that have incorporated a specific service bulletin (SB No. 166-51).\n\n**What it requires:**\n- **Inspection:** Check the swing bearings (part number 5206) in the engine and propeller control cables to ensure they're secure in their terminal fittings. This must happen every 25 hours of flight time.\n- **Modification:** Replace or upgrade the joint and bearing assembly according to Piaggio's service bulletin SB No. 166-54.\n\n**Deadlines:**\n- **Inspections:** Start by 25 flight hours after 10 January 1968, then repeat every 25 flight hours until the modification is done.\n- **Modification:** Must be completed before 1 June 1968.\n\n**Why it matters:** This addresses a potential mechanical failure in the control cables that operate the engines and propellers. If these bearings fail, pilots could lose control of engine power or propeller settings — a serious flight safety risk. The repetitive inspection requirement suggests this was considered an urgent safety issue pending permanent modification."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope is confined to the stated Piaggio P166 variants fitted under SB No.166-51 and prescribes inspection and modification actions (Applicability; Requirement 1–2). The instrument sets interim recurring inspections and a fixed deadline for a one-time modification; there is no text indicating expansion or contraction of that original scope."},"complexity_factors":["Narrow technical scope: applies only to Piaggio P166, P166B and P166C incorporating Piaggio SB No.166-51 (Applicability).","Specific parts and fittings referenced (P/N 5206 swing bearings; swinging joint terminal fitting P/N 6161.02) increase technical accuracy but not legal complexity (Requirement 1).","Two-step compliance: recurring inspections at short intervals (every 25 hours) until modification, then a mandatory one‑time modification (Compliance: para. 1 and para. 2).","Firm calendar deadline for modification (before 1 June 1968) imposes scheduling/operational constraints (Compliance: para. 2).","Operational burden sits with aircraft owners/operators and maintenance organisations (implicit in Requirement and Compliance—who must inspect and modify).","Recordkeeping and downtime risk from frequent inspections until modification increases administrative and operational cost exposure (Compliance: para. 1)."],"plain_english_summary":"Requires operators of Piaggio P166, P166B and P166C aircraft fitted per Piaggio SB No.166-51 to inspect P/N 5206 swing bearings in engine and propeller teleflex control joints for security, repeat that inspection every 25 hours until a mandated modification is carried out, and complete the modification per Piaggio SB No.166-54 by 1 June 1968. It affects aircraft owners/operators and maintenance organisations and creates recurring inspection labour and a one‑time modification obligation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p166-33-engine-and-propeller-teleflex-controls-inspection-and-modification","history":"/api/acts/ad-p166-33-engine-and-propeller-teleflex-controls-inspection-and-modification/history","analysis":"/api/acts/ad-p166-33-engine-and-propeller-teleflex-controls-inspection-and-modification/analysis","conflicts":"/api/acts/ad-p166-33-engine-and-propeller-teleflex-controls-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-p166-33-engine-and-propeller-teleflex-controls-inspection-and-modification/important-cases","documents":"/api/acts/ad-p166-33-engine-and-propeller-teleflex-controls-inspection-and-modification/documents"}}