{"id":"F2006B02595","name":"AD/B-2/23 - Main Rotor Blades - Inspection and Replacement","slug":"ad-b-2-23-main-rotor-blades-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41872,"registerId":"commonwealth-F2006B02595-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B-2/23 - Main Rotor Blades - Inspection and Replacement","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)  \nBrantly B-2 Series Helicopters\n\nAD/B-2/23 Main Rotor Blades - Inspection NK and Replacement\n\nApplicability: All model B-2.\n\nRequirement: 1. Inspect the inboard ends of the blades for separation between the blade skin and the foam filler. The inspection is to be made by feel and by sounding the blade skin with a large coin or similar metal object. A feeling of sponginess or a dull sound indicates presence of separation.\n\n    2. With the aid of a lens of not less than 5X power inspect the inboard end of the blade skins for cracks between the rivet heads.\n\n    3. Replace blades P/N B2-248-53 and B2-248-53A, with blades P/N B2-248-53M or B2-248-101; or\n\nFAA AD 61-23-1.\n\nCompliance: For Para. 1 \\- Before each flight. (This inspection may be performed and certified by the pilot).\n\nFor Para. 2 \\- At intervals not exceeding 25 hours time in service until blades P/N B2-248-53M or B2-248-101 have been fitted.\n\nFor Para. 3 - For aircraft now on Australian Register replace before further flight if separation more than 12 inches in length is present or if cracks are found around two or more rivet heads, and for new aircraft replace before the issue of C. of A.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific helicopter model. It has not expanded beyond its original purpose of ensuring main rotor blade integrity."},"complexity_factors":["Single, specific aircraft type (Brantly B-2 series) with narrow applicability","Only three distinct requirements with clear, sequential numbering","Minimal defined terms — only standard aviation abbreviations (P/N for Part Number, C. of A. for Certificate of Airworthiness)","Simple conditional logic: 'if X found, then replace before flight'","No cross-references to other legislation beyond citation of originating FAA directive (AD 61-23-1)","Compliance deadlines are explicit and unambiguous (before each flight, 25-hour intervals, before further flight)","Total length is approximately 200 words"],"plain_english_summary":"This AD orders mandatory inspections of Brantly B-2 main rotor blades to detect skin-to-foam separation and rivet cracks: a tactile/coin-tap check before every flight and a 5×-magnified inspection every 25 flight hours. If separation exceeds ~12 inches or cracks occur at two or more rivets, blades must be replaced with improved models before further flight. It affects all Brantly B-2 owners, operators, maintainers and pilots in Australia and aims to prevent catastrophic blade failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to all Brantly B‑2 helicopters and mandates inspection and replacement actions as stated. The text shows no expansion or narrowing of applicability beyond those aircraft or of the required corrective actions; it imposes recurring checks and specified part replacements without altering the class of affected aircraft."},"complexity_factors":["Multiple inspection methods: subjective tactile/coin‑sounding preflight check and magnified visual inspection (Para.1–2)","Different compliance intervals and conditions (before each flight; ≤25 hours; before further flight if separation >12 inches) creating scheduling demands","Parts replacement requirement limited to specific part numbers and acceptable substitutes (Para.3)","Pilot allowed to certify pre‑flight inspection increases operator discretion and potential variability in detection","Cross‑reference to FAA AD introduces an external regulatory linkage"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of all Brantly B‑2 helicopters to inspect main rotor blade inboard ends for skin‑to‑foam separation (by feel and coin‑sounding) before each flight, perform a 5× lens check for cracks at intervals ≤25 flight hours until upgraded blades are fitted, and replace specified blade part numbers with approved replacements. Pilots may perform and certify the pre‑flight check (Para.1); owners pay for recurring inspections and any mandatory blade replacements (Para.2–3)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-23-main-rotor-blades-inspection-and-replacement","history":"/api/acts/ad-b-2-23-main-rotor-blades-inspection-and-replacement/history","analysis":"/api/acts/ad-b-2-23-main-rotor-blades-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-b-2-23-main-rotor-blades-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-b-2-23-main-rotor-blades-inspection-and-replacement/important-cases","documents":"/api/acts/ad-b-2-23-main-rotor-blades-inspection-and-replacement/documents"}}