{"id":"F2006B10610","name":"AD/HU 269/48 Amdt 1 - Canopy Slat - Inspection and Modification","slug":"ad-hu-269-48-amdt-1-canopy-slat-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116483,"registerId":"commonwealth-F2006B10610-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/48 Amdt 1 - Canopy Slat - Inspection and 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)  Schweizer (Hughes) 269 Series Helicopters\n\n \n\nAD/HU 269/48\n\nAmdt 1\n\n\nCanopy Slat - Inspection and Modification 5/75\n\n \n\nApplicability: All models 269A, 269A-1, 269B. Model 269C with S/Nos. 0001 to 0390 fitted with canopy slat P/N 269A2297 or 269A2297-7.\n\n \n\nRequirement:  1. Visually inspect the canopy slat over its entire length for cracks. Inspect slat attachment hardware and canopy attachment areas for condition and security. Cracked components must be replaced before further flight.\n\n \n\n2. Modify the canopy slat, P/N 269A2297 or 269A2297-7, in accordance with Hughes SIN No. N-127.\n\n \n\nCompliance: 1. At each daily or overnight inspection until incorporation of the modification.\n\n \n\n2. Within 50 hours time in service after 30 May 1975.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical defect in specific helicopter models. It has not expanded beyond its original purpose of addressing canopy slat integrity."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 substantive requirements with clear, numbered instructions","Limited applicability criteria (specific models, serial number range, and part numbers)","Simple compliance timeline (repeated inspections until modification, then single deadline)","No defined terms section, no cross-references to other legislation, no nested exceptions","Single external reference to manufacturer service bulletin (Hughes SIN No. N-127)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific helicopters.\n\n**What it does:**\nOrders owners and operators of certain Schweizer (formerly Hughes) 269 series helicopters to **inspect and modify a part called the \"canopy slat\"** — a structural component on the helicopter's canopy (the transparent enclosure around the cockpit).\n\n**Who it affects:**\n- All models 269A, 269A-1, and 269B\n- Model 269C with serial numbers 0001 to 0390\n- **Only if** fitted with canopy slat part numbers 269A2297 or 269A2297-7\n\n**What must be done:**\n1. **Repeated inspections:** Visually check the entire canopy slat for cracks, and inspect the attachment hardware and canopy attachment areas for condition and security. This must happen at **every daily or overnight inspection** until the modification is done. Any cracked parts must be replaced before flying again.\n\n2. **Permanent modification:** Modify the canopy slat following Hughes Service Information Notice (SIN) No. N-127. This must be completed **within 50 hours of flight time after 30 May 1975**.\n\n**Why it matters:**\nCracks in the canopy slat could lead to structural failure, potentially causing the canopy to detach or fail in flight. This directive prevents accidents by ensuring defects are caught early and permanently fixed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument states its applicability and sets inspection and modification requirements but does not itself indicate any expansion or contraction of that applicability. The text names affected models/serials and the required actions; no explicit change of scope from a prior instrument is stated in this document."},"complexity_factors":["Applicability specificity — precise models and serial-number range identified (Applicability).","Dual obligations — immediate recurring inspections plus a mandated one-off modification (Requirement 1 & 2; Compliance 1 & 2).","Safety-critical replacement rule — cracked components must be replaced before further flight, raising immediate operational impact (Requirement 1).","Dependence on external document — modification must follow Hughes SIN No. N-127, creating reliance on an external service instruction for compliance (Requirement 2).","Temporal compliance detail — a firm compliance window tied to a historical date and hours-in-service metric (Compliance 2: within 50 hours after 30 May 1975).","Operational burden frequency — inspections required at each daily or overnight inspection until modification is incorporated (Compliance 1)."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Schweizer (Hughes) 269 helicopters to inspect the canopy slat and its fittings for cracks at each daily or overnight check and to modify the slat part number 269A2297 / 269A2297-7 according to Hughes Service Instruction N-127. Cracked parts must be replaced before further flight, and the modification had to be completed within 50 hours time in service after 30 May 1975. It affects aircraft listed by model and serial number and imposes recurring inspection and a one-off modification."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-48-amdt-1-canopy-slat-inspection-and-modification","history":"/api/acts/ad-hu-269-48-amdt-1-canopy-slat-inspection-and-modification/history","analysis":"/api/acts/ad-hu-269-48-amdt-1-canopy-slat-inspection-and-modification/analysis","conflicts":"/api/acts/ad-hu-269-48-amdt-1-canopy-slat-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-hu-269-48-amdt-1-canopy-slat-inspection-and-modification/important-cases","documents":"/api/acts/ad-hu-269-48-amdt-1-canopy-slat-inspection-and-modification/documents"}}