{"id":"F2006B05497","name":"AD/PA-23/70 Amdt 1 - Stabilator Tip Tube and Weight Assembly - Inspection and Modification","slug":"ad-pa-23-70-amdt-1-stabilator-tip-tube-and-weight-assembly-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46340,"registerId":"commonwealth-F2006B05497-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/70 Amdt 1 - Stabilator Tip Tube and Weight Assembly - Inspection and 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-23/70\n\nAmdt 1\n\n\nStabilator Tip Tube and Weight Assembly - Inspection and Modification\n\n\n5/77\n\n \n\nApplicability: All model PA23-250 Aztec “F” with S/Nos. 27-7654001 to 27-7754057. Document:               1. Piper SB No. 540; and\n\n2. Piper SB No. 547 (as applicable).\n\n \n\n| Compliance: | For 1: | Inspect within 100 hours time in service after 31 March 1977 and modify |\n| --- | --- | --- |\n|  | <br>For 2: | within 200 hours time in service after 31 March 1977.<br> <br>Within 100 hours time in service after 31 May 1977. |\n\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":3456},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original targeted scope concerning stabilator safety for specific aircraft models. There is no evidence of scope expansion beyond the original airworthiness concern."},"complexity_factors":["References to external technical documents (Piper Service Bulletins 540 and 547) not reproduced in the directive","Applicability limited to specific serial number range requiring verification against aircraft logbooks","Dual compliance pathways depending on which service bulletin applies to the specific aircraft","Use of aviation-specific terminology (stabilator, time in service) requiring technical familiarity"],"plain_english_summary":"This AD requires owners/operators of Piper PA‑23‑250 Aztec “F” aircraft (S/N 27‑7654001 through 27‑7754057) to inspect and modify the stabilator tip tube and weight assembly per Piper’s service instructions. Compliance must follow one of two Piper service bulletins within the specified short flight‑hour windows. The rule addresses possible tail structural/balance defects that could cause loss of control, so timely inspection and modification are mandatory."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-70-amdt-1-stabilator-tip-tube-and-weight-assembly-inspection-and-modification","history":"/api/acts/ad-pa-23-70-amdt-1-stabilator-tip-tube-and-weight-assembly-inspection-and-modification/history","analysis":"/api/acts/ad-pa-23-70-amdt-1-stabilator-tip-tube-and-weight-assembly-inspection-and-modification/analysis","conflicts":"/api/acts/ad-pa-23-70-amdt-1-stabilator-tip-tube-and-weight-assembly-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-pa-23-70-amdt-1-stabilator-tip-tube-and-weight-assembly-inspection-and-modification/important-cases","documents":"/api/acts/ad-pa-23-70-amdt-1-stabilator-tip-tube-and-weight-assembly-inspection-and-modification/documents"}}