{"id":"F2006B10660","name":"AD/HU 369/100 - Life-limit of Pitch Control Components","slug":"ad-hu-369-100-life-limit-of-pitch-control-components","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116584,"registerId":"commonwealth-F2006B10660-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/100 - Life-limit of Pitch Control Components","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 369/100 Life-limit of Pitch Control Components 11/99\n\nApplicability: All Model 600N helicopters.\n\nRequirement: 1. Apply the serial number listed in McDonnell Douglas Helicopter Systems Service Bulletin 600N-009, dated February 24, 1998, to the two collective stick housings, part numbers (P/N) 369A7347 and 369A7820; the pilot collective pitch control tube, P/N 369A7348; and the co-pilot collective pitch control tube, P/N 369A7809, in the most visible spot for the specified aircraft serial number\n\n    2. Remove and replace the following flight control components according to the stated life-limits:\n\n| Part Number | Component                                   | Life-Limit (Hours TIS) |\n| ----------- | ------------------------------------------- | ---------------------- |\n| 369A7347    | Housing, collective stick                   | 450                    |\n| 369A7348    | Tube, collective pitch control (pilot)      | 400                    |\n| 369H7354-3  | Tube assembly, collective pitch (pilot)     | 600                    |\n| 369A7809    | Tube, collective pitch control (co-pilot)   | 1,800                  |\n| 369A7820    | Housing, collective stick                   | 450                    |\n| 369H7837    | Housing, collective stick                   | 450                    |\n| 369H7838-3  | Tube assembly, collective pitch (co- pilot) | 1,000                  |\n\n    3. This Directive, pursuant to CAR 50A (2) also directs that log cards be raised and retained in the helicopter log book to record the helicopter time in service at installation for each of the components listed in Requirement 2 of this Directive.\n\nThis Directive supersedes information contained in the Airworthiness Limitations Section of the maintenance manual and reduces the life-limits of the pilot collective pitch control tube, the collective stick housings, and the collective pitch tube assemblies, and adding the co-pilot collective pitch control tube to the Airworthiness Limitations Section, Component Mandatory Replacement Schedule.\n\nNote: FAA AD 99-17-18 Amdt 39-11264 refers.\n\nCompliance: 1. On or before reaching 400 hours time in service (TIS).\n\n    2. Not later than the stated life-limit time.\n\n    3. At the time of compliance with Requirement 1 of this Directive. This Airworthiness Directive becomes effective on 4 November 1999.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBackground: The FAA received fatigue test results that indicated a need for shorter service lives for certain components related to pitch control of the Model 600N helicopter.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope. It was issued specifically to address fatigue test findings for Model 600N helicopter pitch control components, and it does exactly that — setting life-limits and record-keeping requirements for those specific parts. There is no evidence of scope creep into unrelated systems or aircraft types."},"complexity_factors":["Short, single-purpose directive focused on one aircraft model","Clear tabular presentation of part numbers, component names, and life-limits","Only 3 main requirements with specific, measurable compliance deadlines","Minimal cross-referencing (only one external FAA AD reference and one service bulletin)","No nested conditional logic or exceptions — requirements apply uniformly to all affected helicopters","Technical but not legally convoluted; aviation terminology is standard for the industry"],"plain_english_summary":"The CASA safety order requires operators of McDonnell Douglas (Hughes) Model 600N helicopters in Australia to label specific collective stick housings and control tubes, record those serials in the logbook, and replace critical pitch‑control components at prescribed time‑in‑service limits. It adopts FAA AD 99‑17‑18 but tightens the manufacturer's life limits to reduce fatigue‑failure risk that could cause loss of pitch control. Effective 4 November 1999."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive shortens service lives for several pilot collective components, adds the co‑pilot collective pitch control tube to the mandatory replacement schedule, and requires visible part marking and logbook entries—thereby changing the existing Airworthiness Limitations Section and mandatory replacement requirements (see 'This Directive supersedes...' and Requirement 1–3)."},"complexity_factors":["Prescriptive, limited scope: specific part numbers and fixed hours TIS life‑limits reduce interpretive complexity (Requirement 2).","Multiple affected parts with different life‑limits increases administrative tracking burden for operators (Requirement 2 table).","Mandatory marking and log‑card entries add record‑keeping and maintenance workflow changes (Requirement 1 and 3).","Supersession of maintenance manual limits requires operators to reconcile updated AD with existing maintenance documentation (supersedes Airworthiness Limitations Section).","Cross‑reference to FAA AD creates an external compliance anchor operators must monitor (Note: FAA AD 99‑17‑18).","Clear compliance deadlines (mark by 400 hours; replace by life‑limit) reduce regulator discretion but require timely operational planning (Compliance)."],"plain_english_summary":"This Civil Aviation Safety Authority airworthiness directive requires operators of McDonnell Douglas (Hughes) Model 600N helicopters to mark certain pitch‑control parts, replace specified components at set life‑limits, and record installation times in the helicopter logbook. The AD cites FAA fatigue test results showing shorter service lives; operators bear the cost of marking, replacements and record‑keeping, while the regulator enforces compliance deadlines (marking by 400 hours TIS and replacement at the stated life‑limits)."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-100-life-limit-of-pitch-control-components","history":"/api/acts/ad-hu-369-100-life-limit-of-pitch-control-components/history","analysis":"/api/acts/ad-hu-369-100-life-limit-of-pitch-control-components/analysis","conflicts":"/api/acts/ad-hu-369-100-life-limit-of-pitch-control-components/conflicts","importantCases":"/api/acts/ad-hu-369-100-life-limit-of-pitch-control-components/important-cases","documents":"/api/acts/ad-hu-369-100-life-limit-of-pitch-control-components/documents"}}