{"id":"F2006B08316","name":"AD/CESSNA 400/30 - Main Landing Gear Upper Strut - Inspection","slug":"ad-cessna-400-30-main-landing-gear-upper-strut-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115723,"registerId":"commonwealth-F2006B08316-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/30 - Main Landing Gear Upper Strut - 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)  Cessna 400 Series Aeroplanes\n\n \n\nAD/CESSNA 400/30 Main Landing Gear Upper Strut - Inspection 6/78\n\nApplicability: All models with S/Nos. as listed in requirement document. Document:  Cessna SL ME71-28.\n\nCompliance: Before issue of a Certificate of Airworthiness.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on landing gear inspection for one aircraft series. It has not expanded beyond its original purpose. The document appears to be a historical directive (dated 6/78) presented in a modern regulatory format, maintaining its narrow, safety-critical scope."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — relies entirely on external reference (Cessna SL ME71-28)","Single, unconditional requirement with no exceptions or nested conditions","No cross-references to other legislation beyond the enabling regulation (CAR 1998 Part 39)","Simple binary applicability test (specific serial numbers listed in external document)","Single compliance trigger (before Certificate of Airworthiness issuance)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice, but for aircraft rather than cars.\n\n**What it requires:** Owners and operators of certain **Cessna 400 series aeroplanes** must inspect the **main landing gear upper strut** (a critical structural component that supports the aircraft's weight during landing) before the aircraft can be issued a **Certificate of Airworthiness** (the official document that says an aircraft is safe to fly).\n\n**Who it affects:** Anyone who owns or operates a Cessna 400 series aircraft with specific serial numbers listed in Cessna Service Letter ME71-28.\n\n**Why it matters:** Landing gear failures can be catastrophic. This directive ensures that a known potential defect in the upper strut assembly is identified and addressed before the aircraft is certified as airworthy. It's a preventive safety measure to catch structural problems before they cause accidents during takeoff or landing.\n\n**Key details:**\n- **Compliance deadline:** Before the aircraft can get its Certificate of Airworthiness (so effectively, before it can legally fly)\n- **Technical reference:** Cessna Service Letter ME71-28 contains the specific serial numbers and inspection procedures\n- **Origin:** Originally issued in June 1978 (the \"6/78\" reference), showing this is a long-standing safety requirement"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text sets a narrow, pre-certification inspection requirement for identified Cessna 400 series aircraft and refers to a specific Cessna document for procedure and serial-number scope. There is no information in the supplied text indicating the scope has been altered from an earlier or original intent."},"complexity_factors":["Requirement text is short and narrowly focused (inspection of a specific part).","Scope is defined by an external document and a serial-number list, requiring cross-referencing.","Compliance timing ties to Certificate of Airworthiness issuance, which can affect certification workflows.","No detailed inspection procedure or alternatives are included in the directive text itself; implementers must consult the referenced Cessna document."],"plain_english_summary":"This AD requires inspection of the main landing gear upper strut on Cessna 400 series aeroplanes whose serial numbers are listed in Cessna SL ME71-28. It applies to owners/operators of those aircraft, the maintenance personnel who must carry out the inspection, and the Civil Aviation Safety Authority as regulator.\n\nWhy it matters: the inspection (per SL ME71-28) must be completed before a Certificate of Airworthiness can be issued, shifting inspection technicals to the Cessna document and costs/delays to owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-30-main-landing-gear-upper-strut-inspection","history":"/api/acts/ad-cessna-400-30-main-landing-gear-upper-strut-inspection/history","analysis":"/api/acts/ad-cessna-400-30-main-landing-gear-upper-strut-inspection/analysis","conflicts":"/api/acts/ad-cessna-400-30-main-landing-gear-upper-strut-inspection/conflicts","importantCases":"/api/acts/ad-cessna-400-30-main-landing-gear-upper-strut-inspection/important-cases","documents":"/api/acts/ad-cessna-400-30-main-landing-gear-upper-strut-inspection/documents"}}