{"id":"F2006B07150","name":"AD/SUPP/5 Amdt 1 - Air Equipment Hoists - \"Up Limit\" Micro Switches - Inspection and Modification","slug":"ad-supp-5-amdt-1-air-equipment-hoists-up-limit-micro-switches-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49003,"registerId":"commonwealth-F2006B07150-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SUPP/5 Amdt 1 - Air Equipment Hoists - \"Up Limit\" Micro Switches - Inspection and Modification","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nSupplementary Equipment\n\nAD/SUPP/5\n\nAmdt 1\n\n  \n\nAir Equipment Hoists \\- \"Up Limit\" Micro Switches - Inspection and Modification\n\n  \n3/85\n\nApplicability: All Air Equipment hoists P/No. 76370, 76370-010, \\-011, \\-020 and \\-030 fitted to helicopters.\n\nRequirement: 1. Model 76370-010 hoist : Gain access to \"Up Limit\" micro switches by removing cover from micro switch enclosure. Inspect micro switches and interior of enclosure for evidence of moisture ingress and/or corrosion. If either is detected replace micro switches before further use of the hoist\n\n2. Model 76370, 76370-010, -011, -020 and -030 hoists: Modify the hoist according to the instructions contained in Air Equipment Service Information Letter No. 25.62.0E.\n\nCompliance: For Para 1: Before further use of the hoist after 5 July 1984 and thereafter at periods not exceeding 3 months. The inspection requirements are terminated after the hoist has been modified.\n\nFor Para 2: Before further use of the hoist after 31 August 1985.\n\nBackground: A dual \"up limit\" micro switch failure attributed to water ingress has occurred. The hoist cable and hook assembly continued past the normal up limit position until cable failure occurred approximately 200mm from the hook.\n\nThis Directive is raised in issue to reflect the manufacturers maintenance requirements.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2499},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This amendment expands the original directive from a simple recurring inspection regime to include a mandatory permanent airworthiness modification. The original likely required only repetitive 3-monthly inspections; this version introduces a definitive one-time modification that supersedes the inspection requirement, fundamentally changing the compliance mechanism from ongoing maintenance to corrective action."},"complexity_factors":["Mandatory cross-reference to external technical manual (Air Equipment Service Information Letter No. 25.62.0E) for modification instructions","Dual compliance tracks with conditional termination (inspection requirement ceases only after modification is completed)","Specific part number applicability requiring physical verification of installed equipment","Asymmetric applicability (inspection applies only to one sub-model, modification applies to all)"],"plain_english_summary":"This directive fixes a design flaw in Air Equipment helicopter hoists that lets water corrode the up‑limit switches and allow the cable to overwrap and break. It applies to affected Air Equipment hoists named in the directive.\n\nOperators must inspect the 76370‑010 switch housing for moisture before first use after 5 July 1984 and every three months (replace if corroded), and complete a manufacturer’s permanent modification on all listed models before first use after 31 August 1985. This prevents catastrophic load drops."}},"importantCases":[],"_links":{"self":"/api/acts/ad-supp-5-amdt-1-air-equipment-hoists-up-limit-micro-switches-inspection-and-modification","history":"/api/acts/ad-supp-5-amdt-1-air-equipment-hoists-up-limit-micro-switches-inspection-and-modification/history","analysis":"/api/acts/ad-supp-5-amdt-1-air-equipment-hoists-up-limit-micro-switches-inspection-and-modification/analysis","conflicts":"/api/acts/ad-supp-5-amdt-1-air-equipment-hoists-up-limit-micro-switches-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-supp-5-amdt-1-air-equipment-hoists-up-limit-micro-switches-inspection-and-modification/important-cases","documents":"/api/acts/ad-supp-5-amdt-1-air-equipment-hoists-up-limit-micro-switches-inspection-and-modification/documents"}}