{"id":"F2006B08409","name":"AD/CESSNA 500/9 Amdt 1 - Static Port - Modification","slug":"ad-cessna-500-9-amdt-1-static-port-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115867,"registerId":"commonwealth-F2006B08409-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 500/9 Amdt 1 - Static Port - 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 500/9\n\nAmdt 1\n\n\nStatic Port - Modification 2/79\n\n \n\nApplicability: Model 500 S/Nos. 0001 to 0142, 0144, 0146 to 0149 and 0151 to 0349. Document:  Cessna Citation SB 34-20, Rev. 1.\n\nCompliance: Unless already accomplished, within 100 hours time in service after 28 February 1979.\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":1638},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive remains tightly scoped to its original purpose: mandating a specific safety modification to the static port system of early-production Cessna 500 aircraft. There is no evidence of scope expansion beyond this singular technical requirement."},"complexity_factors":["Extremely short document with only three operative sections (Applicability, Document, Compliance)","No defined terms or interpretation clauses","Single, unconditional compliance action with only one exception ('unless already accomplished')","Limited applicability restricted to specific aircraft serial numbers","No cross-references to other legislative provisions"],"plain_english_summary":"This directive orders owners of specific **Cessna 500 Citation** business jets to modify the aircraft's **static port** — a small external opening that feeds air pressure to critical flight instruments like altimeters, airspeed indicators, and vertical speed indicators.\n\n**Who must comply?**\nOwners and operators of Cessna 500 aircraft with serial numbers 0001–0142, 0144, 0146–0149, and 0151–0349.\n\n**What action is required?**\nThe static port must be modified exactly as described in **Cessna Service Bulletin 34-20, Revision 1** (a manufacturer-issued technical instruction). This ensures the instruments receive accurate atmospheric pressure readings and display correct altitude and speed to the pilots.\n\n**By when?**\nUnless the work was already completed earlier, the modification must be performed within **100 hours of flight time** after 28 February 1979."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-500-9-amdt-1-static-port-modification","history":"/api/acts/ad-cessna-500-9-amdt-1-static-port-modification/history","analysis":"/api/acts/ad-cessna-500-9-amdt-1-static-port-modification/analysis","conflicts":"/api/acts/ad-cessna-500-9-amdt-1-static-port-modification/conflicts","importantCases":"/api/acts/ad-cessna-500-9-amdt-1-static-port-modification/important-cases","documents":"/api/acts/ad-cessna-500-9-amdt-1-static-port-modification/documents"}}