{"id":"F2006B05319","name":"AD/P166/26 - Engine and Propeller Installation Teleflex Controls - Modification","slug":"ad-p166-26-engine-and-propeller-installation-teleflex-controls-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45765,"registerId":"commonwealth-F2006B05319-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P166/26 - Engine and Propeller Installation Teleflex Controls - 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/P166/26 Engine and Propeller Installation Teleflex Controls - Modification\n\nApplicability: All model P166 with S/Nos. 1 to 405. Document:  1. Piaggio SB P166-31; or\n\n2. FAA AD 63-15-5; or\n\n \n\n3. RAI AD 63-23/P166-13, Rev. 1.\n\n \n\nCompliance: Before 1 April 1964.\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\n10/63\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 1963 with a single, specific purpose. There is no evidence of scope creep; it addresses one identified mechanical issue in one aircraft type with a clear technical remedy."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 3 defined compliance pathways (the three referenced documents)","Single applicability criterion (serial number range)","No nested exceptions or conditional logic","No cross-references to other legislation beyond the three named technical documents","Simple binary compliance requirement (modify before deadline)"],"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). Think of it like a compulsory recall notice, but for aircraft instead of cars.\n\n**What it does:** It requires owners and operators of specific **Piaggio P166 series aeroplanes** (twin-engine utility aircraft) to modify the **Teleflex controls** in the engine and propeller installation. \"Teleflex controls\" are essentially the cable-and-pulley systems that connect the pilot's cockpit controls to the engines and propellers — critical for throttle, pitch, and feathering operations.\n\n**Who it affects:** All Piaggio P166 aircraft with **serial numbers 1 through 405**.\n\n**What must be done:** Operators must comply with one of three approved technical documents:\n- Piaggio Service Bulletin P166-31 (manufacturer's official fix), **or**\n- FAA AD 63-15-5 (the US aviation regulator's equivalent safety order), **or**  \n- RAI AD 63-23/P166-13 Rev. 1 (an earlier Italian aviation authority directive)\n\n**Deadline:** The modification had to be completed **before 1 April 1964**.\n\n**Why it matters:** Faulty engine or propeller controls can lead to loss of power control, asymmetric thrust, or inability to feather a propeller (critical for engine-out safety). This AD addresses a known safety defect before it causes accidents."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text makes no indication that the scope has been altered from its stated applicability. It explicitly applies to \"All model P166 with S/Nos. 1 to 405\" and requires modification according to one of three listed documents by the stated deadline (Applicability; Document; Compliance). There is no language in the supplied text that expands or narrows that applicability beyond those serial numbers or changes the required compliance mechanism."},"complexity_factors":["Narrow, clearly stated applicability limited to a single aircraft model and specific serial numbers (Applicability).","Requirement points to external technical documents rather than containing technical instructions itself, so compliance depends on those documents (Document).","A specific, historical compliance deadline is given, which is straightforward but time‑sensitive (Compliance).","The AD text does not include enforcement mechanisms, cost or parts details, increasing reliance on external sources for implementation specifics (Document).","Vintage issuance (10/63) means referenced documents and parts availability may be dated, potentially complicating practical implementation."],"plain_english_summary":"This AD requires modification of Teleflex engine and propeller controls on Piaggio P.166 aircraft, serial numbers 1–405.  \n\nOwners/operators must arrange and fund the work and comply by 1 April 1964, completing the modification in accordance with one of the three referenced technical documents (Piaggio SB P166-31, FAA AD 63-15-5, or RAI AD 63-23/P166-13 Rev.1)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p166-26-engine-and-propeller-installation-teleflex-controls-modification","history":"/api/acts/ad-p166-26-engine-and-propeller-installation-teleflex-controls-modification/history","analysis":"/api/acts/ad-p166-26-engine-and-propeller-installation-teleflex-controls-modification/analysis","conflicts":"/api/acts/ad-p166-26-engine-and-propeller-installation-teleflex-controls-modification/conflicts","importantCases":"/api/acts/ad-p166-26-engine-and-propeller-installation-teleflex-controls-modification/important-cases","documents":"/api/acts/ad-p166-26-engine-and-propeller-installation-teleflex-controls-modification/documents"}}