{"id":"F2006B05794","name":"AD/PA-31/89 - Elevator Torque Tube Attachment","slug":"ad-pa-31-89-elevator-torque-tube-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135698,"registerId":"commonwealth-F2006B05794-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/89 - Elevator Torque Tube Attachment","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-31/89 Elevator Torque Tube Attachment 3/80\n\nApplicability: All models PA-31 and PA-31-325 with S/Nos. 31-7712059 31-7912094. All model PA-31-350 with S/Nos. 31-7752101 to 31-7952185.\n\n \n\nRequirement: Action in accordance with Piper SB No. 664. Compliance:  Within 100 hours time in service after 29 February 1980.\n\nBackground: A possibility exists on the referenced aeroplanes of the elevator torque tube attachment to the elevator butt ribs having anchor nuts which do not meet the self locking requirement.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1912},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope targeting a specific mechanical defect in specific Piper aircraft models. It has not expanded beyond the original safety issue regarding elevator torque tube anchor nuts."},"complexity_factors":["Single page document with no defined terms section","Straightforward applicability clause listing specific aircraft serial numbers only","Simple compliance requirement referencing a single external technical standard (Piper SB No. 664)","No conditional logic, exceptions, or nested provisions","Clear compliance deadline based on flight hours rather than calendar date"],"plain_english_summary":"**What this is:** An Airworthiness Directive (a mandatory safety order) requiring owners of specific Piper aircraft to inspect and fix a potentially dangerous flaw in the elevator control system.\n\n**Who it affects:** Owners and operators of Piper PA-31, PA-31-325, and PA-31-350 aircraft with specific serial numbers (ranging from 31-7712059 to 31-7952185).\n\n**What you must do:** Follow the instructions in Piper Service Bulletin No. 664 to check the elevator torque tube attachment (the connection between the control tube and the elevator surface). You must complete this within 100 hours of flying time after 29 February 1980.\n\n**Why it matters:** The anchor nuts (fasteners that hold the connection together) on these aircraft might not meet self-locking standards. If they fail, the pilot could lose control of the elevator — the part of the tail that makes the plane go up and down — creating a serious crash risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-89-elevator-torque-tube-attachment","history":"/api/acts/ad-pa-31-89-elevator-torque-tube-attachment/history","analysis":"/api/acts/ad-pa-31-89-elevator-torque-tube-attachment/analysis","conflicts":"/api/acts/ad-pa-31-89-elevator-torque-tube-attachment/conflicts","importantCases":"/api/acts/ad-pa-31-89-elevator-torque-tube-attachment/important-cases","documents":"/api/acts/ad-pa-31-89-elevator-torque-tube-attachment/documents"}}