{"id":"F2006B10666","name":"AD/HU 369/106 Amdt 1 - Helicopter Technology Main Rotor Blades","slug":"ad-hu-369-106-amdt-1-helicopter-technology-main-rotor-blades","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116596,"registerId":"commonwealth-F2006B10666-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/106 Amdt 1 - Helicopter Technology Main Rotor Blades","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)  \n![](image.002.png)  \nMcDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/HU 369/106 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nAD/HU 369/106\n\nAmdt 1\n\n  \nHelicopter Technology Main Rotor Blades 1/2001\n\nDM\n\nApplicability: Model 369A, H, HE, HM, HS, D, E, FF, and 500N helicopters, equipped with main rotor blade part number 500P2100-BSC, serial number with a prefix of “K” and 101 through 562; part number 500P2100-101 or 500P2100-301, serial number with a prefix of “A” and 001 through 999 or serial number with a prefix of “B” and 001 through 529; or part number 500P2300-501, serial number with a prefix of “T” and 101 through 107; manufactured by Helicopter Technology Company, LLC.\n\nRequirement: Perform a tap check on both the upper and lower surfaces of each blade in accordance with the “Inspection” paragraph of Helicopter Technology Company , LLC, Mandatory Service Bulletin Notice No. 2100-2R2, dated 14 November 2000.\n\nIf any voids are detected on a blade that exceed specified inspection requirements of the service bulletin, before further flight, replace the blade with a serviceable blade.\n\nNote: Emergency FAA AD 2000-25-52 refers.\n\nCompliance: Before further flight after 13 December 2000, unless already accomplished.\n\nThis Amendment becomes effective on 13 December 2000.\n\nBackground: The FAA received a report of a main rotor blade failure due to fatigue cracking that originated at corrosion pits on the spar bonded surfaces, resulting in an accident that destroyed a Hughes Model 369D helicopter.\n\nAmendment 1 is issued in response to a new FAA AD which clarifies the affected blade part numbers and serial numbers, as listed in applicability.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nThe original issue of this Airworthiness Directive became effective on 27 November 2000.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.003.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 6 December 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 20 December 2000.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original safety purpose — addressing fatigue cracking in specific Helicopter Technology main rotor blades. The amendment simply clarifies and expands the list of affected part and serial numbers based on new information from the FAA, without expanding into unrelated operational or maintenance areas."},"complexity_factors":["Multiple nested applicability conditions requiring cross-referencing of part numbers, serial number prefixes, and number ranges","Reference to external technical document (Helicopter Technology Company Mandatory Service Bulletin Notice No. 2100-2R2) for actual inspection procedures — the AD itself doesn't contain the technical details","Conditional compliance logic: immediate action required unless already accomplished","Cross-reference to US Federal Aviation Administration emergency AD (2000-25-52) for additional context","Amendment structure requires understanding relationship to superseded directive"],"plain_english_summary":"This AD revokes and replaces a prior emergency order and requires immediate \"tap check\" inspections of certain main rotor blades and removal of any blade with internal voids exceeding limits. It applies to McDonnell Douglas (Hughes) and Kawasaki 369-series helicopters fitted with specified Helicopter Technology Company, LLC blades. Issued after a fatal blade failure from fatigue cracking at corrosion pits, compliance is required before further flight to prevent in‑flight blade separation and catastrophic loss."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 does not change the inspection or replacement requirement but clarifies the applicability by specifying additional/accurate part numbers and serial number ranges for affected main rotor blades, aligning the AD with the FAA action (Background; Applicability)."},"complexity_factors":["Serial-number and part-number specific applicability narrows affected fleet but requires records checks (Applicability)","Single required inspection method is a subjective tap check, creating potential variability in detection (Requirement)","Immediate compliance timing: inspection required before further flight after specified date (Compliance)","Mandatory reliance on an external service bulletin for inspection procedure and acceptance criteria (Requirement)","Mandatory replacement if defects exceed limits creates potential substantial cost to operators (Requirement/Compliance)","Cross-reference to FAA emergency AD and accident background links domestic action to foreign regulator findings (Note/Background)","Amendment confined to clarifying affected part/serial numbers rather than changing the inspection mandate (Background)"],"plain_english_summary":"This Airworthiness Directive requires operators of specified McDonnell Douglas (Hughes) and Kawasaki 369-series helicopters fitted with certain Helicopter Technology main rotor blades to perform a tap inspection of the upper and lower blade surfaces following Helicopter Technology Mandatory Service Bulletin No. 2100-2R2. If the inspection finds voids beyond the bulletin’s limits, the blade must be replaced before further flight. The measure responds to a reported blade failure from fatigue cracking at corrosion pits (Requirement; Compliance; Applicability; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-106-amdt-1-helicopter-technology-main-rotor-blades","history":"/api/acts/ad-hu-369-106-amdt-1-helicopter-technology-main-rotor-blades/history","analysis":"/api/acts/ad-hu-369-106-amdt-1-helicopter-technology-main-rotor-blades/analysis","conflicts":"/api/acts/ad-hu-369-106-amdt-1-helicopter-technology-main-rotor-blades/conflicts","importantCases":"/api/acts/ad-hu-369-106-amdt-1-helicopter-technology-main-rotor-blades/important-cases","documents":"/api/acts/ad-hu-369-106-amdt-1-helicopter-technology-main-rotor-blades/documents"}}