{"id":"F2006B05499","name":"AD/PA-23/72 - Auto Pilot Servo Bridle Clamp Bolt Torque - Modification","slug":"ad-pa-23-72-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repealed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":46345,"registerId":"commonwealth-F2006B05499-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/72 - Auto Pilot Servo Bridle Clamp Bolt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-23 (Apache and Aztec) Series Aeroplanes\n\n \n\nAD/PA-23/72 Auto Pilot Servo Bridle Clamp Bolt Torque - Modification\n\nApplicability: Model PA23-250 with S/Nos. 27-4575 to 27-7754077. Document:  Piper SB No. 558.\n\nCompliance: Within 100 hours time in service after 30 September 1977.\n\n\n9/77\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2163},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains its original targeted scope—a specific technical modification addressing a single mechanical defect on identified aircraft. There is no evidence of scope expansion beyond the initial safety issue."},"complexity_factors":["Extremely narrow applicability (single aircraft model and specific serial number range)","Single, unconditional compliance requirement with a clear deadline","No defined terms or interpretation sections","No cross-references to other legislative provisions beyond the enabling regulation"],"plain_english_summary":"This **Airworthiness Directive** (a mandatory safety order from the aviation regulator) requires owners of specific Piper aircraft to fix a potential fault in the autopilot system.\n\n**Who is affected?**\nOwners and operators of Piper PA-23-250 model aircraft with serial numbers between 27-4575 and 27-7754077.\n\n**What must be done?**\nThe bolt that holds the autopilot servo bridle clamp must be modified to ensure it is tightened to the correct tension (torque). This work must follow the manufacturer's instructions in Piper Service Bulletin No. 558.\n\n**When?**\nWithin 100 hours of flight time after 30 September 1977.\n\n**Why it matters:**\nImproper bolt torque could cause the autopilot to fail, creating a safety risk during flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-72-auto-pilot-servo-bridle-clamp-bolt-torque-modification","history":"/api/acts/ad-pa-23-72-auto-pilot-servo-bridle-clamp-bolt-torque-modification/history","analysis":"/api/acts/ad-pa-23-72-auto-pilot-servo-bridle-clamp-bolt-torque-modification/analysis","conflicts":"/api/acts/ad-pa-23-72-auto-pilot-servo-bridle-clamp-bolt-torque-modification/conflicts","importantCases":"/api/acts/ad-pa-23-72-auto-pilot-servo-bridle-clamp-bolt-torque-modification/important-cases","documents":"/api/acts/ad-pa-23-72-auto-pilot-servo-bridle-clamp-bolt-torque-modification/documents"}}