{"id":"F2006B05487","name":"AD/PA-23/60 Amdt 1 - Stabilator Attachment Bolts - Inspection and Replacement","slug":"ad-pa-23-60-amdt-1-stabilator-attachment-bolts-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46309,"registerId":"commonwealth-F2006B05487-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/60 Amdt 1 - Stabilator Attachment Bolts - 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-23 (Apache and Aztec) Series Aeroplanes\n\n \n\nAD/PA-23/60\n\nAmdt 1\n\n\nStabilator Attachment Bolts - Inspection and Replacement\n\n\n3/74\n\n \n\nApplicability: All models PA-23 with S/Nos. 27-1 to 27-4654.\n\n \n\nRequirement: Remove the LH and RH stabilator attachment bolt and inspect bolts for corrosion.\n\n \n\nCompliance: Within 100 hours time in service after 31 January 1974 and there- after at intervals not exceeding 3 months until replaced in accordance with Piper SL No. 667.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1245},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original narrow scope of addressing stabilator bolt corrosion in specific Piper PA-23 aircraft. There is no evidence of scope creep beyond the original safety intent of preventing structural failure due to corroded attachment hardware."},"complexity_factors":["Single, clearly defined aircraft model range (PA-23, S/Nos. 27-1 to 27-4654)","Single, specific maintenance action (remove and inspect two bolts)","Clear, unambiguous compliance timeline (100 hours TIS + 3-monthly intervals)","No nested exceptions, conditional logic, or definitional sections","Minimal cross-referencing (only to external Piper Service Letter No. 667)"],"plain_english_summary":"**What this does:** This safety directive mandates regular inspections of critical bolts that attach the horizontal tail control surface (the \"stabilator\") on specific Piper twin-engine aircraft.\n\n**Who it affects:** Owners and operators of Piper PA-23 Apache and Aztec aeroplanes with serial numbers 27-1 through 27-4654.\n\n**What you must do:**\n* Remove the left and right stabilator attachment bolts\n* Inspect them for corrosion (rust)\n* Complete the first inspection within 100 flight hours after 31 January 1974\n* Repeat the inspection every 3 months until the bolts are replaced according to Piper Service Letter No. 667\n\n**Why it matters:** Corroded attachment bolts could lead to structural failure of the tail section, potentially causing loss of aircraft control. This directive ensures potentially weakened bolts are identified before they fail."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-60-amdt-1-stabilator-attachment-bolts-inspection-and-replacement","history":"/api/acts/ad-pa-23-60-amdt-1-stabilator-attachment-bolts-inspection-and-replacement/history","analysis":"/api/acts/ad-pa-23-60-amdt-1-stabilator-attachment-bolts-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-pa-23-60-amdt-1-stabilator-attachment-bolts-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-pa-23-60-amdt-1-stabilator-attachment-bolts-inspection-and-replacement/important-cases","documents":"/api/acts/ad-pa-23-60-amdt-1-stabilator-attachment-bolts-inspection-and-replacement/documents"}}