{"id":"F2006B05157","name":"AD/CESSNA 188/22 - Wing Front and Rear Spar","slug":"ad-cessna-188-22-wing-front-and-rear-spar","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45263,"registerId":"commonwealth-F2006B05157-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 188/22 - Wing Front and Rear Spar","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 188 (Agwagon) Series Aeroplanes\n\nAD/CESSNA 188/22 Wing Front and Rear Spar 5/74\n\nApplicability: All models prior to 1972 Agwagon model S/Nos. 188-0001 to 188-00832. Requirement: 1. Inspect for cracks in:\n\n    (a) the front spar at the splice area near the strut pick-up;\n\n    (b) the front spar at the fuselage attachment area;\n\n    (c) the rear spar at the fuselage attachment area;\n\nin accordance with Cessna Service Bulletin No. SE 74-4.\n\n2. Inspect for cracks in the upper flange of the rear spar channel at the outer end of the attachment fitting.\n\nThe inspections shall be carried out using a magnifying glass of at least 4X magnification or alternatively a device such as a “Syte Ade” may be employed.\n\nCompliance: 1. For unmodified aircraft \\- at intervals not exceeding 100 hours time in service.\n\n    2. For aircraft modified to Rex Drawing No. RA491, Issue 4 \\- At intervals not exceeding 150 hours time in service.\n\n    3. For aircraft with doubler P/N 1620058.1 installed or service kit called out in SL No. SE 74-4 \\- at intervals not exceeding 500 hours time in service, after 31 May 1974.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive focused on a specific structural fatigue issue in a single aircraft model series. It has not expanded beyond its original safety purpose."},"complexity_factors":["Short, single-purpose document (one aircraft type, one safety issue)","Only 4 specific inspection locations defined","Simple conditional structure: 3 compliance tiers based on modification status","Minimal cross-referencing (only to Cessna Service Bulletin SE 74-4 and one drawing number)","No defined terms section or interpretation provisions","Straightforward applicability criteria (model years and serial numbers)"],"plain_english_summary":"This mandatory CASA Airworthiness Directive targets Cessna 188 \"Agwagon\" aircraft built before 1972, requiring regular inspections of wing spars for cracking (critical attachment points and a rear-spar flange) using a 4x magnifier or approved alternative. Inspection intervals vary by modification: typically 100 hours for unmodified planes, 150 hours for certain Rex-modified aircraft, and up to 500 hours for specific doubler/kit modifications. It matters because spar cracks can cause catastrophic structural failure and wing separation."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive defines a clear applicability (pre-1972 Cessna 188 Agwagon S/N 188-0001 to 188-00832) and prescribes inspection requirements and intervals. The text contains no indication that the instrument’s scope has been altered from its stated applicability or requirements."},"complexity_factors":["Multiple precise inspection locations (front spar splice near strut pick-up; front spar fuselage attachment; rear spar fuselage attachment; upper flange of rear spar channel at outer end of attachment fitting)","Different mandatory compliance intervals tied to modification state (100, 150 and 500 hours time in service)","Applicability limited by specific model year and serial number range (pre-1972, S/N 188-0001 to 188-00832)","Prescribed inspection method (minimum 4× magnification or equivalent device such as 'Syte Ade')","Dependence on external documents and parts (Cessna Service Bulletin No. SE 74-4; Rex Drawing No. RA491 Issue 4; doubler P/N 1620058.1; SL No. SE 74-4)","A retrospective timing condition for the 500-hour interval ('after 31 May 1974') which affects when that interval applies"],"plain_english_summary":"This airworthiness directive requires owners/operators of Cessna 188 (Agwagon) aeroplanes (serial numbers 188-0001 to 188-00832, built before 1972) to inspect specified front- and rear-spar locations for cracks using at least 4× magnification or an equivalent device, following Cessna Service Bulletin SE 74-4. Inspection intervals vary by modification status: unmodified aircraft every 100 hours, aircraft modified per Rex Drawing RA491 Issue 4 every 150 hours, and aircraft with doubler P/N 1620058.1 or the service kit every 500 hours (after 31 May 1974)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-188-22-wing-front-and-rear-spar","history":"/api/acts/ad-cessna-188-22-wing-front-and-rear-spar/history","analysis":"/api/acts/ad-cessna-188-22-wing-front-and-rear-spar/analysis","conflicts":"/api/acts/ad-cessna-188-22-wing-front-and-rear-spar/conflicts","importantCases":"/api/acts/ad-cessna-188-22-wing-front-and-rear-spar/important-cases","documents":"/api/acts/ad-cessna-188-22-wing-front-and-rear-spar/documents"}}