{"id":"F2006B05762","name":"AD/PA-31/58 - Auto Pilot Servo Bridle Clamp Bolt Torque - Modification","slug":"ad-pa-31-58-auto-pilot-servo-bridle-clamp-bolt-torque-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135621,"registerId":"commonwealth-F2006B05762-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/58 - Auto Pilot Servo Bridle Clamp Bolt Torque - 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-31 Series Aeroplanes\n\n \n\nAD/PA-31/58 Auto Pilot Servo Bridle Clamp Bolt Torque - Modification\n\n\n9/77\n\n \n\nApplicability: Model PA-31 and PA-31-325 S/Nos. 31-712 to 31-7612089. Model PA-31-350 S/Nos. 31-5001 to 31-7652146; Model PA-31P S/Nos. 31P-1 to 31P-7730005; and Model PA-31T S/Nos. 31T-1400002 to 31T-7720025.\n\n \n\nDocument: Piper SB No. 558.\n\n \n\nCompliance: Within 100 hours time in service after 30 September 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2129},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted safety directive addressing a specific mechanical defect in autopilot systems. It remains focused on its original purpose of ensuring proper bolt torque on specific aircraft models."},"complexity_factors":["External reference to manufacturer service bulletin (Piper SB 558) required to perform the actual work","Technical aviation terminology specific to autopilot servo mechanics","Serial number-specific applicability requiring aircraft record verification","Compliance calculated based on 'time in service' (flight hours) rather than calendar date"],"plain_english_summary":"This AD requires owners/operators of certain Piper PA‑31 Navajo and Chieftain airplanes (specific serial ranges) to inspect and modify the autopilot servo bridle clamp bolts per Piper Service Bulletin No. 558. The modification must be done within 100 flight hours after 30 Sep 1977. It’s a mandatory safety action to prevent autopilot failure and maintain airworthiness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-58-auto-pilot-servo-bridle-clamp-bolt-torque-modification","history":"/api/acts/ad-pa-31-58-auto-pilot-servo-bridle-clamp-bolt-torque-modification/history","analysis":"/api/acts/ad-pa-31-58-auto-pilot-servo-bridle-clamp-bolt-torque-modification/analysis","conflicts":"/api/acts/ad-pa-31-58-auto-pilot-servo-bridle-clamp-bolt-torque-modification/conflicts","importantCases":"/api/acts/ad-pa-31-58-auto-pilot-servo-bridle-clamp-bolt-torque-modification/important-cases","documents":"/api/acts/ad-pa-31-58-auto-pilot-servo-bridle-clamp-bolt-torque-modification/documents"}}