{"id":"F2006B09025","name":"AD/DHC-1/9 - Rudder Torque Tube Flange - Inspection","slug":"ad-dhc-1-9-rudder-torque-tube-flange-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52707,"registerId":"commonwealth-F2006B09025-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/9 - Rudder Torque Tube Flange - 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)  De Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\n \n\nAD/DHC-1/9 Rudder Torque Tube Flange - Inspection 9/57\n\nApplicability: All models.\n\n \n\nRequirement: 1. Remove the rudder, clean the Rudder Torque Flange P/N C1-TR-91, and inspect for cracks in the area of the shoulders on the semi- circular flange and the rivets securing the flange to the rudder torque tube. This inspection shall be made by either the dye penetrant method or visually with the aid of a 10X lens.\n\n \n\n2. If cracking has occurred replace the flange before further flight; or 3. ANO 105.1.14.15.6.3.\n\nCompliance: At intervals not exceeding 250 hours time in service.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":1874},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a legacy airworthiness directive (originating from 1957) focused narrowly on preventing rudder failure through recurring inspection of a single component. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single maintenance task with binary outcome (replace if cracked, continue if not)","Only one technical abbreviation (P/N for Part Number)","Simple recurring compliance interval of 250 flight hours","Two alternative inspection methods offered without nested conditions","No cross-references to other legislation except an optional alternative compliance path (ANO reference)","Document length under 150 words"],"plain_english_summary":"Owners/operators of De Havilland DHC‑1 Chipmunk aircraft in Australia must inspect the torque‑tube flange (P/N C1‑TR‑91) every 250 flight hours: remove the rudder, clean the flange, and check the curved shoulder and rivets by dye‑penetrant or with a 10x magnifier. \n\nIf any cracks are found the flange must be replaced before further flight — a fatigue‑detection rule to prevent rudder control failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-9-rudder-torque-tube-flange-inspection","history":"/api/acts/ad-dhc-1-9-rudder-torque-tube-flange-inspection/history","analysis":"/api/acts/ad-dhc-1-9-rudder-torque-tube-flange-inspection/analysis","conflicts":"/api/acts/ad-dhc-1-9-rudder-torque-tube-flange-inspection/conflicts","importantCases":"/api/acts/ad-dhc-1-9-rudder-torque-tube-flange-inspection/important-cases","documents":"/api/acts/ad-dhc-1-9-rudder-torque-tube-flange-inspection/documents"}}