{"id":"F2006B05443","name":"AD/PA-23/1 - Flap Spar and Stabiliser Spar - Reinforcement","slug":"ad-pa-23-1-flap-spar-and-stabiliser-spar-reinforcement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46169,"registerId":"commonwealth-F2006B05443-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/1 - Flap Spar and Stabiliser Spar - Reinforcement","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-23/1 Flap Spar and Stabiliser Spar - Reinforcement NK\n\nApplicability: Model PA-23 with S/Nos. prior to 23-64 as detailed in SL. Document:  Piper SL No. 235.\n\nCompliance: Forthwith.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1728},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains a narrow, targeted scope focused solely on structural reinforcement of specific serial-numbered Piper PA-23 aircraft. It has not expanded beyond the original safety issue to cover unrelated aircraft types or systems."},"complexity_factors":["Single, unambiguous applicability clause limited to specific model and serial number range","Immediate compliance requirement with no conditional timelines, exceptions, or alternative methods","No defined terms or interpretation section","References only one external technical document (Piper SL No. 235)","Extremely short length with no nested sections or cross-references to other legislation"],"plain_english_summary":"**What this directive does**\n\nThis is a mandatory safety order requiring owners to immediately reinforce two critical structural components on specific Piper aircraft:\n* **Flap spar** — the main structural beam that supports the wing flaps\n* **Stabiliser spar** — the structural beam in the tail assembly\n\n**Who it affects**\n\nOwners and operators of **Piper PA-23 Apache and Aztec** aeroplanes with serial numbers **prior to 23-64** (earlier production models).\n\n**What you must do**\n\n* Follow the technical instructions in **Piper Service Letter No. 235** to complete the reinforcement work\n* Comply **immediately** (the directive uses the term \"forthwith,\" meaning there is no grace period)\n\n**Why it matters**\n\nThe reinforcement addresses potential structural weaknesses in these specific aircraft that could pose safety risks if left uncorrected."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-1-flap-spar-and-stabiliser-spar-reinforcement","history":"/api/acts/ad-pa-23-1-flap-spar-and-stabiliser-spar-reinforcement/history","analysis":"/api/acts/ad-pa-23-1-flap-spar-and-stabiliser-spar-reinforcement/analysis","conflicts":"/api/acts/ad-pa-23-1-flap-spar-and-stabiliser-spar-reinforcement/conflicts","importantCases":"/api/acts/ad-pa-23-1-flap-spar-and-stabiliser-spar-reinforcement/important-cases","documents":"/api/acts/ad-pa-23-1-flap-spar-and-stabiliser-spar-reinforcement/documents"}}