{"id":"F2006B05591","name":"AD/PA-28/31 - Seat Frame - Modification","slug":"ad-pa-28-31-seat-frame-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46641,"registerId":"commonwealth-F2006B05591-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-28/31 - Seat Frame - 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-28 Series Aeroplanes\n\n \n\nAD/PA-28/31 Seat Frame - Modification 5/71\n\nApplicability: All the following models having vertically adjustable pilot and/or co-pilot seat installations:\n\n \n\nModel PA-28-140 with S/Nos. 28-26401 to 28-26956 and 28-7125001 to 28-7125227.\n\nModel PA-28-180 with S/Nos. 28-5601 to 28-5869 and 28-7105001 to 28-7105017. Model PA-28R-180 with S/Nos. 28R-31251 to 28R-31279, 28R-7130001 and\n\n28R- 713002.\n\nModel PA-28R-200 with S/Nos. 28R-35601 to 28R- 35830 and 28R-7135001 to 28R-7135070.\n\nModel PA-28-235 with S/Nos. 28-11301 to 28-11393 and 28-7110001 to 28-7110009.\n\n \n\nDocument: Piper SB No. 337.\n\n \n\nCompliance: Within 100 hours time in service after 31 May 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1873},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope targeting specific seat frame modifications in defined aircraft models. There is no indication of expansion beyond the initial safety issue addressed."},"complexity_factors":["Specific serial number ranges must be cross-checked to determine applicability","Actual modification instructions contained in external reference document (Piper SB No. 337) rather than in the directive itself","Compliance threshold measured in 'hours time in service' (flight hours) rather than calendar date"],"plain_english_summary":"**What this is:** A mandatory safety instruction (called an *Airworthiness Directive*) for owners of specific Piper Cherokee aircraft.\n\n**What it requires:** If you own one of the affected planes, you must modify the seat frames according to Piper Service Bulletin No. 337. This applies only to aircraft with vertically adjustable pilot or co-pilot seats.\n\n**Who is affected:** Owners and operators of these specific Piper PA-28 models and serial numbers:\n- **PA-28-140:** S/N 28-26401 to 28-26956 and 28-7125001 to 28-7125227\n- **PA-28-180:** S/N 28-5601 to 28-5869 and 28-7105001 to 28-7105017\n- **PA-28R-180:** S/N 28R-31251 to 28R-31279, 28R-7130001 and 28R-713002\n- **PA-28R-200:** S/N 28R-35601 to 28R-35830 and 28R-7135001 to 28R-7135070\n- **PA-28-235:** S/N 28-11301 to 28-11393 and 28-7110001 to 28-7110009\n\n**When you must comply:** Within 100 hours of flight time after 31 May 1971.\n\n**Why it matters:** This ensures the structural integrity of seat frames to prevent potential seat failure during flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-31-seat-frame-modification","history":"/api/acts/ad-pa-28-31-seat-frame-modification/history","analysis":"/api/acts/ad-pa-28-31-seat-frame-modification/analysis","conflicts":"/api/acts/ad-pa-28-31-seat-frame-modification/conflicts","importantCases":"/api/acts/ad-pa-28-31-seat-frame-modification/important-cases","documents":"/api/acts/ad-pa-28-31-seat-frame-modification/documents"}}