{"id":"F2006B05760","name":"AD/PA-31/56 - Aircraft Data Plate - Inspection and Replacement","slug":"ad-pa-31-56-aircraft-data-plate-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135619,"registerId":"commonwealth-F2006B05760-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/56 - Aircraft Data Plate - Inspection and Replacement","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-31 Series Aeroplanes\n\n \n\nAD/PA-31/56 Aircraft Data Plate - Inspection and Replacement 7/77\n\nApplicability: Model PA-31 and PA-31-310 with S/Nos. 31-7401201 to 7401268, 31-7512001 to 31-7512072, 31-7612001 to 31-7612088.\n\n \n\nDocument: Piper SB No. 529.\n\n \n\nCompliance: Within 100 hours time in service after 31 July 1977.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive focused on a specific technical issue (data plate replacement) for a narrow cohort of aircraft. It has not expanded beyond its original scope."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 operative provisions: applicability, reference document, compliance deadline, and action required","No defined terms section","No cross-references to other legislation beyond the enabling regulations (Part 39)","Simple conditional logic: if you own this specific aircraft model with these serial numbers, you must do this specific action by this deadline","Single external reference (Piper Service Bulletin 529) with no nested conditions"],"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) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of specific Piper PA-31 aircraft to **inspect and replace the aircraft data plate** (the metal plate that identifies the aircraft's manufacturer, model, and serial number) if necessary.\n\n**Who it affects:** Owners and operators of Piper PA-31 and PA-31-310 aircraft with specific serial numbers (ranging from 31-7401201 to 31-7612088). These are older twin-engine Navajo aircraft built in the mid-1970s.\n\n**Why it matters:** The data plate is crucial for aircraft identification and legal airworthiness. If it's damaged, missing, or illegible, the aircraft cannot be legally flown. This directive ensures these specific aircraft have proper identification plates installed.\n\n**What must be done:** Operators must comply with Piper Service Bulletin No. 529 and complete the inspection/replacement **within 100 hours of flight time after 31 July 1977**.\n\n**Key point:** This is a **historical directive from 1977**. While it remains on the books, it would only affect aircraft still operating that haven't already complied in the past 47+ years."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument, as presented, sets a one-time inspection/replacement requirement for specific Piper PA-31/PA-31-310 serial numbers and references Piper SB No. 529 for technical steps (Applicability; Document; Compliance). There is no text in the provided instrument indicating any amendment to, extension of, or departure from that original scope."},"complexity_factors":["Narrow, explicit applicability limited to a small range of serial numbers (Applicability).","Single, time-limited compliance action with a clear deadline (Compliance).","Technical detail delegated to an external service bulletin (Document), creating a dependency but not internal complexity in the AD text.","No multi-step regulatory process or phased implementation described in the AD itself; enforcement route is standard for airworthiness directives (header)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specific Piper PA‑31 and PA‑31‑310 aircraft (listed serial numbers) to inspect—and, if indicated, replace—aircraft data plates following Piper Service Bulletin No. 529. Work must be completed within 100 hours TIS after 31 July 1977. It creates a short, enforceable compliance obligation and shifts inspection costs and any replacement work to operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-56-aircraft-data-plate-inspection-and-replacement","history":"/api/acts/ad-pa-31-56-aircraft-data-plate-inspection-and-replacement/history","analysis":"/api/acts/ad-pa-31-56-aircraft-data-plate-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-pa-31-56-aircraft-data-plate-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-pa-31-56-aircraft-data-plate-inspection-and-replacement/important-cases","documents":"/api/acts/ad-pa-31-56-aircraft-data-plate-inspection-and-replacement/documents"}}