{"id":"F2006B10651","name":"AD/HU 269/93 - Tail Rotor Blade Spar","slug":"ad-hu-269-93-tail-rotor-blade-spar","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116566,"registerId":"commonwealth-F2006B10651-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/93 - Tail Rotor Blade Spar","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nSchweizer (Hughes) 269 Series Helicopters\n\nAD/HU 269/93 Tail Rotor Blade Spar 7/88\n\nApplicability: All 269 series helicopters equipped with P/N 269A6035-21 or P/N 269A6035-23 tail rotor blades having serial numbers as listed in the Requirement document.\n\nRequirement: Action in accordance with Schweizer Service Information Notice No N-212. Compliance: Unless already accomplished, within the next 600 flight hours or prior to 31 March\n\n1989 whichever occurs first.\n\nBackground: Recent x-ray inspections of the affected tail rotor blade spars have revealed corrosion pits that were not evident during the periodic visual inspections for corrosion, required by HMI Appendix B. The manufacturer has determined that the pitting was caused by corrosion which occurred prior to the cadmium plate process on the blade spar.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1776},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains a narrow, technical scope focused solely on the identified corrosion defect in specific tail rotor blade part numbers. It has not expanded beyond the original safety purpose of addressing the manufacturing defect in the cadmium plating process."},"complexity_factors":["Single compliance action referencing one external technical document","Specific applicability limited to two part numbers and listed serial numbers","Simple alternative compliance deadline (flight hours OR calendar date)","No defined terms section or legislative cross-references","Self-contained instrument with clear background explanation"],"plain_english_summary":"This AD mandates inspection of specific Schweizer (Hughes) 269 tail rotor blades (parts 269A6035-21 and -23) for hidden spar corrosion per Schweizer Service Information Notice N-212, likely requiring x‑ray or detailed inspection. It applies to operators of affected 269 series helicopters and had to be completed within 600 flight hours or by 31 March 1989. It matters because unseen corrosion in spars can lead to blade failure, loss of tail rotor integrity, and possible crash."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-93-tail-rotor-blade-spar","history":"/api/acts/ad-hu-269-93-tail-rotor-blade-spar/history","analysis":"/api/acts/ad-hu-269-93-tail-rotor-blade-spar/analysis","conflicts":"/api/acts/ad-hu-269-93-tail-rotor-blade-spar/conflicts","importantCases":"/api/acts/ad-hu-269-93-tail-rotor-blade-spar/important-cases","documents":"/api/acts/ad-hu-269-93-tail-rotor-blade-spar/documents"}}