{"id":"F2006B10614","name":"AD/HU 269/52 - Linear Clutch Actuator - Inspection","slug":"ad-hu-269-52-linear-clutch-actuator-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116491,"registerId":"commonwealth-F2006B10614-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/52 - Linear Clutch Actuator - Inspection","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)  \nSchweizer (Hughes) 269 Series Helicopters\n\nAD/HU 269/52 Linear Clutch Actuator \\- Inspection 3/75\n\nApplicability: All models fitted with linear clutch actuators P/N DL 1020 M81C (12V), 269A4564 on DL 1020M82C (28V).\n\nRequirement: A. Remove the actuator and cover at the lug end of the linear clutch actuator in accordance with Hughes 269 Series Maintenance Manual of Instructions, issued April 1973, Revision No. 2, dated January 1, 1974.\n\n    Visually identify the markings on the four number 4-40 Allen head screws which secure the lug to the housing. If any retainer screw has a single band of vertical lines around the outside diameter of the raised head, mutilate and discard the screw. Replace any retainer screw having such vertical lines with new screws having either of the following part numbers, and torque to five to seven inch-pounds: New NY-LACK P/N P60HS440-12C or New Simmonds P/N S6370CESLS4-12.\n\n    2. Operators who have complied with paragraph “D”, per Hughes SIN No. N- 126, dated February 24, 1975, by installing these new screws, are not required to repeat the replacement of the new screws if the procedure of para. A.1 of this AD has been followed.\n\n    3. If the identifying marks on the outside diameter of the raised head consist of anything other than the single band of vertical lines, such as cross hatched band, double band of vertical lines, etc., the retainer screws need not be replaced.\n\nB. After complying with paras. A.1, A.2 and A.3, as applicable, identify the actuators by hand impression stamping the letter “B” on the bottom line of the actuator data plate.\n\nCompliance: Within 10 hours time in service after 17 March 1975.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted airworthiness directive addressing a specific mechanical defect in specific helicopter models. It has not expanded beyond its original purpose of inspecting and replacing potentially faulty screws in linear clutch actuators."},"complexity_factors":["Single specific mechanical component targeted (linear clutch actuator)","Only 4 defined part numbers referenced","Simple conditional logic (if screw has vertical lines → replace; if not → keep)","One exemption clause (operators who already complied with Hughes SIN No. N-126 don't need to replace screws again)","No nested definitions or cross-references to other legislation","Clear, step-by-step procedural structure (A.1, A.2, A.3, B)","Single compliance deadline with straightforward calculation (10 hours time in service after fixed date)"],"plain_english_summary":"This safety directive requires operators of Schweizer/Hughes 269 helicopters with the specified 12V/28V linear clutch actuators to remove the actuator, inspect four retainer screws, destroy and replace any screw marked with a single band of vertical lines, and stamp a \"B\" on the actuator data plate to record compliance. Action must be completed within 10 flight hours after 17 March 1975. It prevents clutch failure that could cause loss of control or engine damage."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope does not change the instrument's original applicability or introduce new affected aircraft types: it applies only to Hughes 269 helicopters fitted with the listed actuator part numbers and prescribes inspection, conditional replacement, and marking. The AD includes a carve-out for operators who previously complied with Hughes SIN N-126 (Section A.2), but otherwise neither broadens nor narrows the set of affected components beyond the stated applicability."},"complexity_factors":["Narrow applicability to specific actuator part numbers (DL 1020 M81C (12V) and DL 1020M82C (28V)) — Applicability clause","Visual-identification judgment required (distinguishing single vertical-line band from other head markings) — Section A.1 / A.3","Mandatory replacement with specified part numbers and a precise torque requirement (5–7 inch-pounds) — Section A.1","Reference to and reliance on an external manufacturer maintenance manual for removal/cover procedures — Section A","Exemption for operators who already installed the new screws per Hughes SIN N-126 (avoids rework) — Section A.2","Permanent identification stamping requirement after compliance (hand impression 'B' on data plate) — Section B","Short compliance window (within 10 hours time-in-service after 17 March 1975) increases scheduling pressure — Compliance clause"],"plain_english_summary":"This airworthiness directive requires owners/operators of Hughes (Schweizer) 269 helicopters fitted with specified linear clutch actuators to remove the actuator cover, visually inspect the four retainer screws for a single vertical-line head marking, replace any such screw with one of two specified replacement part numbers torqued to 5–7 in·lb, and then stamp the actuator data plate with the letter “B”. Compliance must be completed within 10 hours time-in-service after 17 March 1975.\n\nOperators pay for parts and labour; authorised maintenance personnel must perform the work in accordance with the Hughes maintenance manual."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-52-linear-clutch-actuator-inspection","history":"/api/acts/ad-hu-269-52-linear-clutch-actuator-inspection/history","analysis":"/api/acts/ad-hu-269-52-linear-clutch-actuator-inspection/analysis","conflicts":"/api/acts/ad-hu-269-52-linear-clutch-actuator-inspection/conflicts","importantCases":"/api/acts/ad-hu-269-52-linear-clutch-actuator-inspection/important-cases","documents":"/api/acts/ad-hu-269-52-linear-clutch-actuator-inspection/documents"}}