{"id":"F2006B08272","name":"AD/CESSNA 340/27 - Wing Front Spar Lower Attachment Fittings","slug":"ad-cessna-340-27-wing-front-spar-lower-attachment-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115584,"registerId":"commonwealth-F2006B08272-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 340/27 - Wing Front Spar Lower Attachment Fittings","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)  \nCessna 340 Series Aeroplanes\n\nAD/CESSNA340/27 Wing Front Spar Lower Attachment Fittings 6/89\n\nApplicability: All models.\n\nRequirement: 1. Remove the fairing between the wing and carry-thru and gain access to the wing front spar lower attachment fittings P/N 0822550.\n\n    2. Visually inspect the upper and lower edges of the lug of each wing fitting, looking for cracks as shown in the figure below.\n\n    3. From inside the wheel well, visually inspect each visible wing fitting for cracks and surface pitting in the area shown in the figure.\n\nNote: It is not necessary to remove the primer for any of the above inspections.\n\n![](image.002.png)  \n\nWing Fitting Showing Typical Cracking\n\nNote: Fitting Shown removed from aircraft for clarity\n\nCompliance: Before exceeding 5000 hours component time in service or before the issue of the next Maintenance Release after 15 June 1989, whichever is the later. Thereafter, reinspect at each scheduled inspection for issue of a new Maintenance Release.\n\nBackground: Fatigue cracking has been discovered in the wing fitting from an Australian-registered Cessna 310R with 6500 hours time in service. No abnormality could be found in the fitting or the aircraft’s history. Since then stress corrosion cracking has been found in a similar wing fitting in a Cessna 402C with 6400 hours time in service.\n\nThere is insufficient evidence to regard either of these as isolated occurrences: either or both may be expected to occur at a later time elsewhere in the fleet of Cessna twins which use the same generic wing fitting. A simple repetitive visual inspection has therefore been introduced.","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 an Airworthiness Directive (AD) — a specific type of safety instrument that has a narrow, targeted purpose from inception. It addresses a specific mechanical component on a specific aircraft type. There is no indication of scope creep; the document remains focused on its original purpose of mandating inspections for fatigue cracking in wing attachment fittings."},"complexity_factors":["Very short document (approximately 250 words)","Only 3 defined procedural steps","Single applicability criterion (all Cessna 340 models)","Simple compliance timeline (one threshold condition plus recurring requirement)","No cross-references to other legislation or technical standards","Single figure reference with visual aid","No nested exceptions or conditional logic beyond the 'whichever is later' timing clause"],"plain_english_summary":"Owners and operators of Cessna 340 series aircraft must visually inspect the wing front spar lower attachment fitting (after removing the fairing) for cracks and internal pitting to catch any fatigue before failure. The initial check is required by 5,000 flight hours or before the next Maintenance Release after 15 June 1989, and must be repeated at each subsequent Maintenance Release. The rule is preventive: similar fittings cracked on other Cessna models, risking wing separation if undetected."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains limited to the wing front spar lower attachment fittings (P/N 0822550) on Cessna 340 series aircraft. The instrument introduces an initial and ongoing visual inspection requirement but does not broaden coverage to other components or additional mandatory corrective actions beyond inspection."},"complexity_factors":["Applicability to all Cessna 340 models (Applicability)","Physical access requirement: remove fairing between wing and carry‑thru to reach fittings (Requirement 1)","Inspection locations and method are visual only: lug upper/lower edges and visible fittings from wheel well (Requirements 2–3)","No need to remove primer for inspection reduces disassembly and labour (Note)","Initial compliance tied to component hours or the next Maintenance Release after a fixed date; recurring inspections aligned with each scheduled Maintenance Release (Compliance)","Technical trigger: previous findings of fatigue and stress‑corrosion cracking in similar fittings (Background)","Directive is preventive across the fleet despite limited occurrences; this creates recurring compliance obligations for operators (Background)"],"plain_english_summary":"Requires owners/operators and maintenance personnel of Cessna 340 series aeroplanes to remove the fairing and carry out targeted visual inspections of the wing front spar lower attachment fittings (P/N 0822550), including lug edges and visible fittings from inside the wheel well. Initial inspection is required before the fitting exceeds 5,000 hours component time or before the next Maintenance Release after 15 June 1989, and then at each scheduled Maintenance Release thereafter. The stated purpose is to detect fatigue or stress‑corrosion cracking found in similar fittings."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-340-27-wing-front-spar-lower-attachment-fittings","history":"/api/acts/ad-cessna-340-27-wing-front-spar-lower-attachment-fittings/history","analysis":"/api/acts/ad-cessna-340-27-wing-front-spar-lower-attachment-fittings/analysis","conflicts":"/api/acts/ad-cessna-340-27-wing-front-spar-lower-attachment-fittings/conflicts","importantCases":"/api/acts/ad-cessna-340-27-wing-front-spar-lower-attachment-fittings/important-cases","documents":"/api/acts/ad-cessna-340-27-wing-front-spar-lower-attachment-fittings/documents"}}