{"id":"F2006B10733","name":"AD/HU 369/69 Amdt 1 - Main Transmission Output Shaft Assembly Ring Gear Carrier","slug":"ad-hu-369-69-amdt-1-main-transmission-output-shaft-assembly-ring-gear-carrier","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116727,"registerId":"commonwealth-F2006B10733-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/69 Amdt 1 - Main Transmission Output Shaft Assembly Ring Gear Carrier","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)  \nMcDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters\n\nAD/HU 369/69\n\nAmdt 1\n\n  \n\nMain Transmission Output Shaft Assembly Ring Gear Carrier\n\n  \n2/88\n\nApplicability: All model 369D, 369E, 369F and 369FF helicopters.\n\n    Fitted with Part Number 369D25100-BSC, 501 or 503 main transmission assemblies.\n\n    2. All spare Part Number 369D25100-BSC, 501 or 503 main transmission assemblies and Part Number 369D25132- BSC or -5 main transmission output shaft assemblies.\n\nRequirement: Action in accordance with McDonnell Douglas SIN 148.1, EN-36.1 and FN-25.1 as applicable.\n\nNote: FAA AD 87-18-12 refers.\n\nCompliance: For Helicopters:\n\nWithin 100 hours time in service after 10 March 1988 and thereafter at intervals not exceeding 300 hours time in service, or at any time the conditions listed in the “Time of Compliance” section of the Requirement Document occur.\n\nNote: Compliance with AD/HU 369/69 will satisfy the 100 hourly periodic inspection requirements of this Directive.\n\nSpare Parts:\n\nBefore installation on a helicopter after 10 March 1988.\n\nBackground: Due to the manufacturer extending the output shaft part number range, this Directive has been amended to include the additional items requiring inspection for possible cracks in the main rotor transmission output shaft assembly upper and lower disc surface.","sortOrder":0}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This is Amendment 1 to the original AD/HU 369/69. The scope has been expanded from the original directive to include additional part numbers (369D25132-BSC or -5 main transmission output shaft assemblies) that the manufacturer added to their product range after the original directive was issued. The core safety purpose (inspecting for cracks in the output shaft) remains unchanged, but the range of components subject to mandatory inspection has grown."},"complexity_factors":["Short, single-purpose directive with clear applicability criteria","Only 3 defined part number ranges to identify affected components","Simple compliance structure: initial inspection + recurring interval + spare parts precondition","Cross-references to external manufacturer documents (SIN 148.1, EN-36.1, FN-25.1) and FAA AD 87-18-12, but these are incorporated by reference rather than reproduced","No nested exceptions or conditional logic beyond the standard 'whichever occurs first' compliance timing","Plain language background section explaining the amendment rationale"],"plain_english_summary":"This CASA Airworthiness Directive mandates regular inspections of the main transmission output shaft assembly on McDonnell Douglas (Hughes) and Kawasaki 369 series helicopters (369D/E/F/FF) with specified part numbers (369D25100‑BSC, ‑501, ‑503). Inspections check for cracks (initial within 100 flight hours after 10 Mar 1988, then every 300 hours; immediate checks if certain events occur); spare assemblies must be inspected before installation per McDonnell Douglas service bulletins. The amendment adds coverage for additional part numbers."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expanded the Directive's scope to add additional output‑shaft part numbers and spare main transmission assemblies, requiring those items to be inspected for possible cracks in the main rotor transmission output shaft assembly (upper and lower disc surfaces)."},"complexity_factors":["Technical inspection requirement for a specific component (ring‑gear carrier) demanding maintenance shop capability and crack detection expertise.","Reference to multiple manufacturer service instructions (McDonnell Douglas SIN 148.1, EN‑36.1, FN‑25.1) — requires reading and following external documents.","Time‑based and condition‑based compliance triggers: initial 100‑hour deadline, 300‑hour recurring interval, and inspections when 'Time of Compliance' conditions occur.","Applicability tied to specific part numbers and to both installed and spare parts — requires parts tracking and inventory control.","Regulatory cross‑reference to FAA AD 87‑18‑12 and note that compliance substitutes for the 100‑hour periodic inspection — requires coordinative recordkeeping."],"plain_english_summary":"This amendment requires operators of McDonnell Douglas (Hughes) and Kawasaki 369D/E/F/FF helicopters fitted with specified main transmission assemblies or spares to inspect the main transmission output‑shaft ring‑gear carrier for cracks, following McDonnell Douglas service instructions. It mandates an initial inspection within 100 flight hours after 10 March 1988, recurring checks every 300 hours, and inspection of spare parts before installation. Operators bear inspection and repair costs; the Civil Aviation Safety Authority (CASA) requires and enforces compliance. Background: the amendment adds parts after the manufacturer extended the output‑shaft part‑number range."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-69-amdt-1-main-transmission-output-shaft-assembly-ring-gear-carrier","history":"/api/acts/ad-hu-369-69-amdt-1-main-transmission-output-shaft-assembly-ring-gear-carrier/history","analysis":"/api/acts/ad-hu-369-69-amdt-1-main-transmission-output-shaft-assembly-ring-gear-carrier/analysis","conflicts":"/api/acts/ad-hu-369-69-amdt-1-main-transmission-output-shaft-assembly-ring-gear-carrier/conflicts","importantCases":"/api/acts/ad-hu-369-69-amdt-1-main-transmission-output-shaft-assembly-ring-gear-carrier/important-cases","documents":"/api/acts/ad-hu-369-69-amdt-1-main-transmission-output-shaft-assembly-ring-gear-carrier/documents"}}