{"id":"F2006B08300","name":"AD/CESSNA 400/13 - Propeller De-Ice Bolts - Inspection","slug":"ad-cessna-400-13-propeller-de-ice-bolts-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115632,"registerId":"commonwealth-F2006B08300-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/13 - Propeller De-Ice Bolts - 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 400/13 Propeller De-Ice Bolts - Inspection 2/70\n\nApplicability: All models 411, 411A and 421 equipped with propeller de-ice system and fitted with McCauley “K” series or later propellers.\n\n \n\nDocument: Cessna SL ME69-37.\n\n \n\nCompliance: Within 10 hours time in service after 16 February 1970 and there- after on each occasion the propeller, spinner bulkhead or de-icing slip ring is reinstalled or replaced.\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":1558},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow technical scope targeting a specific mechanical inspection for propeller de-ice bolts on particular Cessna aircraft. There is no evidence of scope expansion beyond the original aviation safety intent."},"complexity_factors":["Single-page directive with no sections, parts, or schedules","No defined terms or interpretation clauses","Specific applicability limited to only three aircraft models","Single compliance action with a straightforward deadline","Only one external technical reference (Cessna Service Letter ME69-37)"],"plain_english_summary":"**What this requires**\nThis directive orders a mandatory safety inspection for specific Cessna twin-engine aircraft (models 411, 411A, and 421) that have propeller de-icing systems fitted with McCauley “K” series (or later) propellers.\n\n**Who must comply**\nOwners and operators of the affected aircraft models equipped with the specified de-icing systems.\n\n**What must be done**\nAn inspection of the propeller de-ice bolts must be carried out following the procedures in Cessna Service Letter ME69-37.\n\n**When it must be done**\n*   Within 10 hours of flight time after 16 February 1970; **and**\n*   Every time the propeller, spinner bulkhead, or de-icing slip ring is removed and reinstalled or replaced.\n\n**Why it matters**\nThis ensures the propeller de-icing system—which prevents ice buildup on the propeller blades during flight in freezing conditions—remains mechanically secure and operational."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-13-propeller-de-ice-bolts-inspection","history":"/api/acts/ad-cessna-400-13-propeller-de-ice-bolts-inspection/history","analysis":"/api/acts/ad-cessna-400-13-propeller-de-ice-bolts-inspection/analysis","conflicts":"/api/acts/ad-cessna-400-13-propeller-de-ice-bolts-inspection/conflicts","importantCases":"/api/acts/ad-cessna-400-13-propeller-de-ice-bolts-inspection/important-cases","documents":"/api/acts/ad-cessna-400-13-propeller-de-ice-bolts-inspection/documents"}}