{"id":"F2006B08386","name":"AD/CESSNA 500/12 - Glideslope Interlock - Modification","slug":"ad-cessna-500-12-glideslope-interlock-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115820,"registerId":"commonwealth-F2006B08386-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 500/12 - Glideslope Interlock - 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)  Cessna 500 (Citation) Series Aeroplanes\n\n \n\nAD/CESSNA 500/12 Glideslope Interlock - Modification 9/75\n\nApplicability: Model 500 with S/Nos. 500-0001 to 500-0239. Document:  Cessna Citation SB 34-27.\n\nCompliance: Within 100 hours time in service after 30 September 1975.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1673},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope: a specific hardware modification for early-production Cessna 500 aircraft. No evidence of scope expansion into broader operational requirements or additional aircraft models."},"complexity_factors":["Document contains only essential elements: applicability, reference document, and deadline","No defined terms, interpretation clauses, or legal cross-references","Single straightforward compliance obligation with no exceptions or conditions","Applicability limited to a closed list of serial numbers (no discretionary elements)","No penalty provisions or enforcement mechanisms contained within the instrument"],"plain_english_summary":"This is a mandatory safety order (called an **Airworthiness Directive**) issued by the Civil Aviation Safety Authority for certain Cessna business jets.\n\n**What it requires:**\nOwners and operators of specific Cessna 500 aircraft (serial numbers 500-0001 through 500-0239) must modify the **glideslope interlock** — a safety component of the instrument landing system that helps guide aircraft during approach to landing.\n\n**How to comply:**\nThe modification must be performed exactly as described in **Cessna Service Bulletin 34-27** (the manufacturer's official technical instructions for this repair).\n\n**When to comply:**\nThe work must be completed within 100 hours of flight time after 30 September 1975.\n\n**Why it matters:**\nAirworthiness Directives are legally enforceable. Non-compliance grounds the aircraft — it cannot legally fly in Australian airspace until the modification is done. This directive addresses a specific safety issue with the landing guidance system to prevent approach and landing accidents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-500-12-glideslope-interlock-modification","history":"/api/acts/ad-cessna-500-12-glideslope-interlock-modification/history","analysis":"/api/acts/ad-cessna-500-12-glideslope-interlock-modification/analysis","conflicts":"/api/acts/ad-cessna-500-12-glideslope-interlock-modification/conflicts","importantCases":"/api/acts/ad-cessna-500-12-glideslope-interlock-modification/important-cases","documents":"/api/acts/ad-cessna-500-12-glideslope-interlock-modification/documents"}}