{"id":"F2006B08909","name":"AD/DH 84/2 Amdt 2 - Undercarriage Strut - Inspection","slug":"ad-dh-84-2-amdt-2-undercarriage-strut-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52441,"registerId":"commonwealth-F2006B08909-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 84/2 Amdt 2 - Undercarriage Strut - 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)  \nDH 84 (Dragon) Series Aeroplanes\n\nAD/DH 84/2\n\nAmdt 2\n\n  \nUndercarriage Strut \\- Inspection 11/71\n\nApplicability: All models fitted with undercarriage body struts P/N AH46256A, 42656, AH42657 or 42657.\n\nRequirement: 1. Clean and polish the struts at the weld areas and immediately adjacent thereto.\n\nSubject the polished areas to magnetic particle inspection. (See Figure 1 \\- Page 2).\n\n    2. Any doubt as to the acceptance or rejection of the strut as a result of this inspection is to be referred to the Regional Office of the Department for determination.\n\n    3. Replace any strut which is found to be defective; or DCA/DH84/2A.\n\nCompliance: Within 500 hours time in service from the last inspection and thereafter at intervals not exceeding 500 hours time in service.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.002.png)","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1866},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original safety purpose of preventing undercarriage strut failure on DH 84 aircraft. As Amendment 2, it reflects updated technical guidance rather than an expansion beyond the original scope of landing gear safety inspection."},"complexity_factors":["Narrow applicability limited to four specific part numbers","Single technical compliance method requiring specialised equipment (magnetic particle inspection)","Binary conditional outcome with administrative referral pathway for ambiguous determinations","Simple recurring time-based compliance trigger (500 hours time in service)"],"plain_english_summary":"Operators of DH 84 Dragon biplanes with undercarriage struts part numbers AH46256A, 42656, AH42657, or 42657 must, every 500 flight hours, clean and polish the welded joints and perform a magnetic-particle inspection for cracks. Defective struts must be replaced and uncertain results referred to the CASA Regional Office.\n\nThis rule targets metal fatigue at welds to prevent landing-gear collapse during landing, reducing risk of catastrophic accidents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-84-2-amdt-2-undercarriage-strut-inspection","history":"/api/acts/ad-dh-84-2-amdt-2-undercarriage-strut-inspection/history","analysis":"/api/acts/ad-dh-84-2-amdt-2-undercarriage-strut-inspection/analysis","conflicts":"/api/acts/ad-dh-84-2-amdt-2-undercarriage-strut-inspection/conflicts","importantCases":"/api/acts/ad-dh-84-2-amdt-2-undercarriage-strut-inspection/important-cases","documents":"/api/acts/ad-dh-84-2-amdt-2-undercarriage-strut-inspection/documents"}}