{"id":"F2006B08394","name":"AD/CESSNA 500/2 - Centre Flap Aft Bearing - Modification","slug":"ad-cessna-500-2-centre-flap-aft-bearing-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115836,"registerId":"commonwealth-F2006B08394-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 500/2 - Centre Flap Aft Bearing - 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 500/2 Centre Flap Aft Bearing - Modification 5/73\n\nApplicability: All models with S/Nos. 500-0001 to 500-0069. Document:  Cessna Citation SB 57-3.\n\nCompliance: Before issue of 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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1879},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original limited scope addressing a specific mechanical defect in early production Cessna 500 aircraft. There is no evidence of scope expansion beyond the original centre flap aft bearing safety modification."},"complexity_factors":["Extremely narrow applicability limited to specific aircraft serial numbers (500-0001 to 500-0069)","Single mandatory action with no exceptions or conditional provisions","Incorporation of external technical document (Cessna Service Bulletin 57-3) by reference","No defined terms, interpretation clauses, or penalty provisions within the instrument itself"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety rule issued by the Civil Aviation Safety Authority (CASA) requiring specific repairs or modifications to aircraft.\n\n**What it requires:** Owners of certain Cessna 500 (Citation) business jets must modify the **centre flap aft bearing** (a component in the wing flap system that helps control the aircraft during takeoff and landing). The exact modification procedure is found in **Cessna Service Bulletin 57-3**.\n\n**Who is affected:** Only Cessna 500 aircraft with serial numbers 500-0001 through 500-0069 (the first 69 aircraft built).\n\n**When it must be done:** Before the aircraft can be issued a **Certificate of Airworthiness** — meaning this modification is a prerequisite for the aircraft to be legally permitted to fly.\n\n**Why it matters:** This prevents potential mechanical failure in the flap system, which is critical for safe landing and takeoff operations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-500-2-centre-flap-aft-bearing-modification","history":"/api/acts/ad-cessna-500-2-centre-flap-aft-bearing-modification/history","analysis":"/api/acts/ad-cessna-500-2-centre-flap-aft-bearing-modification/analysis","conflicts":"/api/acts/ad-cessna-500-2-centre-flap-aft-bearing-modification/conflicts","importantCases":"/api/acts/ad-cessna-500-2-centre-flap-aft-bearing-modification/important-cases","documents":"/api/acts/ad-cessna-500-2-centre-flap-aft-bearing-modification/documents"}}