{"id":"F2006B02197","name":"AD/AC-CLA/4 - Wing Lift Struts","slug":"ad-ac-cla-4-wing-lift-struts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41427,"registerId":"commonwealth-F2006B02197-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC-CLA/4 - Wing Lift Struts","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)  \nAircraft Parts and Development (CALL AIR) A-9 Series Aeroplanes\n\nAD/AC-CLA/4 Wing Lift Struts 10/73\n\nApplicability: All A-9 Series.\n\nRequirement: 1. Inspect visually for welds on both sides of the four wing lift struts at the P/N 10671 eye fittings. A 360 fillet weld is required around the eye fitting shank on both sides of the lift strut to seal the strut against moisture. These fittings provide for attachment of the lift struts to the stabilising struts.\n\n    2. If the welds between the eye fittings and the lift struts do not provide a complete seal as specified in para. 1 the lift strut should be removed, and checked for water ingestion visually, and for corrosion by radiographic inspection.\n\n    3. If no water or corrosion is present in the strut, weld the eye fitting to the strut 360 on both sides of the strut and reinstall the strut.\n\n    4. If water is present in the strut (without corrosion) dry the strut, flush with linseed oil, weld the eye fitting to the strut 360 on both sides of the strut and reinstall the strut.\n\n    5. If corrosion is found the strut is to be replaced before further flight.\n\n    6. If the welds between the eye fittings and the lift struts provide a complete seal as specified in para. 1 no further action is required.\n\nCompliance: At next major inspection after 31 October 1973 or 1 February 1974 whichever occurs first.","sortOrder":0}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a specific airworthiness directive (AD) issued under Part 39 of the Civil Aviation Regulations 1988. It addresses exactly one safety issue (wing lift strut corrosion) for exactly one aircraft type (Call Air A-9). The scope remains tightly focused on its original safety purpose with no evidence of scope creep."},"complexity_factors":["Very short document (6 numbered requirements only)","Only one defined term implicitly used (P/N 10671 — a part number)","No cross-references to other legislation or regulations","Simple conditional logic (if/then structure) with clear decision tree","Single applicability criterion (All A-9 Series)","No nested exceptions or sub-delegations"],"plain_english_summary":"This directive requires owners/operators of Call Air A-9 series agricultural aeroplanes to inspect wing lift strut eye‑fitting welds and, where welds are incomplete, remove the strut for radiographic inspection. Depending on findings, struts must be rewelded, dried/flushed and rewelded, or replaced (aircraft grounded until replacement). The rule prevents hidden corrosion that could cause catastrophic wing failure and must be done by the next major inspection (by 31 Oct 1973 or 1 Feb 1974, whichever is earlier)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive addresses sealing of A‑9 series wing lift strut eye fittings to prevent moisture ingress and prescribes inspection/repair or replacement. The text confines applicability to all A‑9 Series and sets procedural outcomes (inspect, radiograph if unsealed, dry/flush/weld, or replace if corroded). There is no indication in the instrument that the scope departs from that stated objective."},"complexity_factors":["Technical inspection requirement: visual inspection for 360° fillet welds around eye fitting shank (para. 1).","Non‑destructive testing may be required: radiographic inspection for corrosion if welds do not seal (para. 2).","Repair options and criteria: allowed actions include welding, drying and linseed‑oil flushing, or replacement depending on water/corrosion findings (paras 3–5).","Clear compliance deadline tied to the next major inspection after specified dates, creating a short fixed window for action (Compliance).","Applicability to all A‑9 Series aircraft concentrates administrative burden on that fleet (Applicability).","Requires qualified maintenance providers for welding and radiography; potential parts replacement logistics if corrosion found (paras 2–5)."],"plain_english_summary":"This airworthiness directive requires owners/operators of CALL AIR A‑9 series aeroplanes to inspect wing lift strut eye‑fitting welds and, if necessary, radiographically inspect, dry, flush, weld or replace struts to prevent moisture ingress (paras 1–6). Compliance is due at the next major inspection after 31 October 1973 or 1 February 1974, whichever occurs first. Owners/operators bear inspection, testing and repair costs; maintenance providers carry out welding or replacements, and the rule narrows immediate maintenance choices and timing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-cla-4-wing-lift-struts","history":"/api/acts/ad-ac-cla-4-wing-lift-struts/history","analysis":"/api/acts/ad-ac-cla-4-wing-lift-struts/analysis","conflicts":"/api/acts/ad-ac-cla-4-wing-lift-struts/conflicts","importantCases":"/api/acts/ad-ac-cla-4-wing-lift-struts/important-cases","documents":"/api/acts/ad-ac-cla-4-wing-lift-struts/documents"}}