{"id":"F2006B05452","name":"AD/PA-23/19 - Elevator Control Tube Bellcrank Attachment - Modification","slug":"ad-pa-23-19-elevator-control-tube-bellcrank-attachment-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46200,"registerId":"commonwealth-F2006B05452-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/19 - Elevator Control Tube Bellcrank Attachment - 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-23/19 Elevator Control Tube Bellcrank Attachment - Modification\n\nApplicability: Models PA-23 and PA-23-160 with S/Nos. 23-1 to 23-1691. Document:  Piper SB No. 176.\n\nCompliance: At intervals not exceeding 100 hours time in service after 30 May 1960.\n\n\n5/60\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1486},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains tightly scoped to its original purpose: addressing a specific mechanical defect in the elevator control system of early production Piper Apache aircraft. There is no evidence of expansion beyond the initial safety concern or creeping applicability to additional aircraft models."},"complexity_factors":["Single-page directive containing only one compliance action","Narrow applicability limited to specific aircraft models and serial number range (23-1 to 23-1691)","Simple recurring compliance interval (100 hours time in service) with no conditional exceptions","References only one external technical document (Piper Service Bulletin No. 176)","No defined terms or interpretation sections requiring legal analysis"],"plain_english_summary":"This Airworthiness Directive (AD) mandates a safety fix for specific Piper Apache and Aztec aircraft.\n\n**What it requires:**\nOwners and operators of certain Piper PA-23 and PA-23-160 model aircraft (serial numbers 23-1 through 23-1691) must modify the **elevator control tube bellcrank attachment** — a component that connects the pilot's control inputs to the elevator (the part of the tail that makes the plane pitch up and down).\n\n**Compliance:**\nAfter 30 May 1960, this modification must be inspected or checked at intervals not exceeding **100 hours of flight time** (\"time in service\") to ensure it remains airworthy.\n\n**Why it matters:**\nThis addresses a potential mechanical defect in the control system that could affect the pilot's ability to control the aircraft's pitch, posing a safety risk if not corrected and regularly monitored."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-19-elevator-control-tube-bellcrank-attachment-modification","history":"/api/acts/ad-pa-23-19-elevator-control-tube-bellcrank-attachment-modification/history","analysis":"/api/acts/ad-pa-23-19-elevator-control-tube-bellcrank-attachment-modification/analysis","conflicts":"/api/acts/ad-pa-23-19-elevator-control-tube-bellcrank-attachment-modification/conflicts","importantCases":"/api/acts/ad-pa-23-19-elevator-control-tube-bellcrank-attachment-modification/important-cases","documents":"/api/acts/ad-pa-23-19-elevator-control-tube-bellcrank-attachment-modification/documents"}}