{"id":"F2006B05558","name":"AD/PA-25/20 - Elevator Cable Link Assembly - Modification","slug":"ad-pa-25-20-elevator-cable-link-assembly-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46533,"registerId":"commonwealth-F2006B05558-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/20 - Elevator Cable Link Assembly - 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)  Piper PA-25 (Pawnee) Series Aeroplanes\n\n \n\nAD/PA-25/20 Elevator Cable Link Assembly - Modification 11/67\n\nApplicability: Model PA-25 and variants of that model with S/Nos. 25-1 to 25-731 and model PA-25-235 and variants of that model with S/Nos. 25-200 to 25-3565.\n\n \n\nDocument: 1. Piper SL No. 455; or\n\n \n\n2. FAA AD 65-15-5.\n\n \n\nCompliance: Before 1 September 1971.\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 Directive sets an obligation (modify the elevator cable link assembly) for the aircraft models and serial numbers it lists and specifies the documents to use and a compliance date. The text does not indicate any expansion or reduction of that scope within the instrument itself (Applicability; Document; Compliance)."},"complexity_factors":["Narrow and specific applicability by model and serial number (Applicability)","Mandatory compliance by a fixed deadline (Compliance)","Technical requirements referenced to external documents rather than contained in the AD (Document) — operators must obtain and follow those documents","No procedural detail in the AD about who performs, pays for, or verifies the work; practical arrangements fall to owners/operators (Applicability; Compliance)","Regulatory context is straightforward (Part 39 Airworthiness Directive) which lowers statutory complexity"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of listed Piper PA‑25 and PA‑25‑235 aeroplanes to modify the elevator cable link assembly by following either Piper Service Letter No. 455 or FAA AD 65‑15‑5. The modification is mandatory and must be completed by 1 September 1971; operators bear responsibility for arranging and funding the work and for consulting the referenced documents for technical details."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on elevator cable link assembly modification for a limited aircraft population. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (specific serial number ranges)","Simple binary compliance option (two acceptable source documents)","Single, absolute deadline with no conditional extensions or exceptions","No cross-references to other legislation or regulatory provisions","No nested conditions, exceptions, or 'unless' clauses","Straightforward mechanical modification with no operational or procedural complexity"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) that mandates a safety modification for specific Piper PA-25 'Pawnee' agricultural aircraft.\n\n**What it does:**\n- Requires owners and operators of certain Piper PA-25 series aeroplanes to modify the **elevator cable link assembly** — a critical control component that connects the pilot's control inputs to the elevator (the part of the tail that makes the plane pitch up and down).\n\n**Who it affects:**\n- Owners and operators of:\n  - Piper PA-25 models with serial numbers 25-1 through 25-731\n  - Piper PA-25-235 models with serial numbers 25-200 through 25-3565\n\n**What must be done:**\n- The modification must be carried out following either:\n  1. **Piper Service Letter No. 455** (the manufacturer's official instruction), OR\n  2. **FAA AD 65-15-5** (the equivalent American safety directive)\n\n**Deadline:**\n- The work had to be completed **before 1 September 1971**.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. They are issued when a design flaw or maintenance issue is discovered that could affect flight safety. This particular AD addresses a potential failure in the elevator control system — if the cable link assembly failed, the pilot could lose pitch control of the aircraft, with potentially catastrophic consequences. Compliance is mandatory, and operating an aircraft without completing required ADs is illegal."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-20-elevator-cable-link-assembly-modification","history":"/api/acts/ad-pa-25-20-elevator-cable-link-assembly-modification/history","analysis":"/api/acts/ad-pa-25-20-elevator-cable-link-assembly-modification/analysis","conflicts":"/api/acts/ad-pa-25-20-elevator-cable-link-assembly-modification/conflicts","importantCases":"/api/acts/ad-pa-25-20-elevator-cable-link-assembly-modification/important-cases","documents":"/api/acts/ad-pa-25-20-elevator-cable-link-assembly-modification/documents"}}