{"id":"F2006B05478","name":"AD/PA-23/51 Amdt 1 - Landing Gear Selector Lever - Inspection","slug":"ad-pa-23-51-amdt-1-landing-gear-selector-lever-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46280,"registerId":"commonwealth-F2006B05478-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/51 Amdt 1 - Landing Gear Selector Lever - Inspection","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-23/51\n\nAmdt 1\n\n\nLanding Gear Selector Lever - Inspection 3/79\n\n \n\nApplicability: All models PA-23, PA-23-235 and PA-23-250 unless fitted with landing gear selector lever P/N 761-213.\n\n \n\nRequirement: Inspect landing gear lever P/N 752-303 for cracks in the vicinity of the two right- angle bends. Where adhesive tape has been used to secure the warning light wires to the lever, the tape shall not be replaced over the area between the bends.\n\n \n\nNote: Piper SB No. 635 refers to this subject.\n\n \n\nCompliance: At intervals not exceeding 100 hours time in service.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The document is styled as Amendment 1, but the supplied text does not include the prior version or compare changes. There is no information in the provided text to determine whether the scope has been expanded or narrowed compared with the original directive."},"complexity_factors":["Narrow applicability to specific Piper PA-23 models and to a specific part number (P/N 752-303) - straightforward scope (Applicability).","Single, focused technical requirement: inspect for cracks at a clearly identified area and do not replace tape over that area (Requirement).","Defined compliance interval (every ≤100 hours TIS) reduces procedural ambiguity (Compliance).","Exemption for aircraft with an alternate part number (P/N 761-213) introduces a substitution choice for operators (Applicability).","Lack of specified remedial action or detailed inspection method in the text creates some implementation discretion and additional interpretive burden (Requirement; Note).","Reference to an external service bulletin (Piper SB No. 635) shifts some technical detail outside the AD itself (Note)."],"plain_english_summary":"This AD requires owners/operators of Piper PA-23, PA-23-235 and PA-23-250 aeroplanes (unless fitted with landing gear selector lever P/N 761‑213) to inspect landing‑gear selector lever P/N 752‑303 for cracks around its two right‑angle bends every 100 hours and to avoid re‑taping warning‑light wiring across that area. It matters because it addresses potential selector‑lever failure risk, creates a recurring inspection burden (or a one‑time replacement alternative), and points operators to Piper Service Bulletin No. 635 for further guidance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical defect in specific aircraft models. It has not expanded beyond its original purpose of ensuring landing gear lever integrity."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined part numbers (P/N 752-303 and P/N 761-213)","Single, straightforward inspection requirement with one minor procedural note about adhesive tape","No cross-references to other legislation or regulations beyond the generic 'Part 39' framework","Simple compliance interval (100 hours time in service)","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Piper twin-engine aircraft (the Apache and Aztec series) to regularly inspect a particular part of the landing gear control.\n\n**What it does:**\n- **Targets:** Piper PA-23, PA-23-235, and PA-23-250 aircraft — unless they've already been upgraded with a different landing gear lever (part number 761-213).\n- **The problem:** The original landing gear selector lever (part number 752-303) can develop cracks where it bends at right angles. If this lever breaks, the pilot could lose control of the landing gear.\n- **What must be done:**\n  - Inspect the lever for cracks in the bend areas.\n  - If adhesive tape is used to hold warning light wires to the lever, don't put the tape back over the area between the bends (this could hide cracks).\n- **How often:** Every 100 hours of flight time.\n\n**Why it matters:** A cracked landing gear lever could fail during flight, preventing the gear from extending or retracting properly — potentially causing a dangerous landing situation. This AD ensures the problem is caught before it causes an accident.\n\n**Background:** This is an amended directive (Amendment 1, originally from March 1979) referencing a Piper Service Bulletin (SB 635), which is a manufacturer's technical notice about safety issues."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-51-amdt-1-landing-gear-selector-lever-inspection","history":"/api/acts/ad-pa-23-51-amdt-1-landing-gear-selector-lever-inspection/history","analysis":"/api/acts/ad-pa-23-51-amdt-1-landing-gear-selector-lever-inspection/analysis","conflicts":"/api/acts/ad-pa-23-51-amdt-1-landing-gear-selector-lever-inspection/conflicts","importantCases":"/api/acts/ad-pa-23-51-amdt-1-landing-gear-selector-lever-inspection/important-cases","documents":"/api/acts/ad-pa-23-51-amdt-1-landing-gear-selector-lever-inspection/documents"}}