{"id":"F2006B10590","name":"AD/HU 269/16 Amdt 4 - Horizontal Stabiliser - Inspection","slug":"ad-hu-269-16-amdt-4-horizontal-stabiliser-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116443,"registerId":"commonwealth-F2006B10590-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/16 Amdt 4 - Horizontal Stabiliser - Inspection","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 269/16\n\nAmdt 4\n\n  \nHorizontal Stabiliser \\- Inspection 11/67\n\nApplicability: Models 269A and 269B except those with low tip speed tail rotors.\n\nRequirement: 1. Helicopters fitted with horizontal stabiliser P/No. 269A2516. Remove the horizontal stabiliser and inspect as much of the spar as is visible for cracking originating from the fasteners and spot welds along the upper flange of the spar. The inspection can be carried out through the lightening holes in the closing rib.\n\n    2. Helicopters fitted with horizontal stabilisers P/No. 269A2511 shall be inspected as detailed in para. 3.\n\n    3. Inspect horizontal stabilisers P/No. 269A2516 by means of an approved radiographic technique for cracks originating from the fasteners and spot welds along the upper and lower flanges of the spar between the root and a point fifteen inches outboard of the root.\n\nCompliance: For Para. 1 - At intervals not exceeding 50 hours time in service. For Para. 2 \\- At intervals not exceeding 400 hours time in service. For Para. 3 \\- At intervals not exceeding 400 hours time in service.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":3344},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"As Amendment 4, this instrument refines the technical inspection procedures and compliance intervals for horizontal stabilisers but maintains the original scope of ensuring structural airworthiness of Schweizer 269 series helicopters. It does not expand to new aircraft types, new systems, or alter the fundamental safety purpose of detecting cracks in stabiliser assemblies."},"complexity_factors":["Conditional requirements branching on specific manufacturer part numbers (P/No. 269A2516 vs 269A2511)","Technical aviation terminology requiring domain knowledge (spar, flanges, lightening holes, spot welds, radiographic technique)","Nested inspection methods with distinct compliance intervals (50 hours vs 400 hours time in service)","Cross-reference structure where paragraph 2 references paragraph 3 for inspection details"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of Schweizer (Hughes) 269A/B helicopters (except those with low-tip-speed tail rotors) to carry out regular inspections of the horizontal stabiliser for fatigue cracks to prevent in-flight structural failure and loss of control. Inspections vary by stabiliser part number and recur on short (50 flight-hour) or longer (400 flight-hour) intervals depending on the component and inspection method."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-16-amdt-4-horizontal-stabiliser-inspection","history":"/api/acts/ad-hu-269-16-amdt-4-horizontal-stabiliser-inspection/history","analysis":"/api/acts/ad-hu-269-16-amdt-4-horizontal-stabiliser-inspection/analysis","conflicts":"/api/acts/ad-hu-269-16-amdt-4-horizontal-stabiliser-inspection/conflicts","importantCases":"/api/acts/ad-hu-269-16-amdt-4-horizontal-stabiliser-inspection/important-cases","documents":"/api/acts/ad-hu-269-16-amdt-4-horizontal-stabiliser-inspection/documents"}}