{"id":"F2006B04978","name":"AD/CESSNA 170/50 - Aileron Hinge Pin","slug":"ad-cessna-170-50-aileron-hinge-pin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44869,"registerId":"commonwealth-F2006B04978-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 170/50 - Aileron Hinge Pin","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 170, 172, F172, FR172 and 175 Series Aeroplanes\n\nAD/CESSNA 170/50 Aileron Hinge Pin 1/84\n\n| Applicability: | Model | Serial Number |\n| -------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| | 172N | 17271035 thru 17274009, |\n| | 172P | 17274010 thru 17275806, 17275809, 17275817 thru 17275854,17275857, 17275861 thru 17275881, 17275883 thru 17275910,17275912 thru 17275947, 17275949 thru 17275953, 17275955 thru17275958, 17275960 thru 17275971, 17275973, 17275974,17275976, 17275978, 17275980 thru 17275982, 17275984,17275986 thru 17275992, 17275994, 17275995, 17275997,17275999 thru 17276002, 17276005, 17276010, 17276012,17276014, |\n| | 172Q | 17275869 thru 17275881, 17275883 thru 17275910, 17275912 thru17275947, 17275949 thru 17275953, 17275955 thru 17275958,17275960 thru 17275971, 17275973, 17275974, 17275976,17275978, 17275980 thru 17275982, 17275984, 17275986 thru17275992, 17275994, 17275995, 17275997, 17275999 thru17276002, 17276005, 17276010, 17276012, 17276014, |\n| | 172RG | 172RG001 thru 172RG1134, 172RG1137, |\n| | R172K | R1722930 thru R1723454, |\n| | F172N | F17201750 thru F17202039, |\n| | F172P | F17202040 thru F17202146, F17202148 thru F17202175, F17202177 thru F17202181, F17202183 thru F17202186, F17202189 thru F17202194, F17202197, F17202200, F17202202, |\n| | FR172K | FR17200631 thru FR17200675. |\n\nRequirement: Action in accordance with Cessna S.I.L. SE83-18.\n\nNote: FAA AD 83-22-06 refers.\n\nCompliance: Unless already accomplished within 100 hours time in service after 31 January 1984 or at the next scheduled inspection for Maintenance Release issue after 31 January 1984, whichever is the later.\n\nBackground: Possible migration and loss of the aileron hinge pin could result if the retaining split pin holes are incorrectly located.","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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive confines its scope to specified Cessna models and serial numbers and prescribes inspection/modification to prevent hinge pin loss. It does not broaden the class of affected aircraft or impose obligations beyond the stated corrective action and compliance timing."},"complexity_factors":["Narrow technical scope: single component (aileron hinge pin) and one corrective action (Cessna S.I.L. SE83-18).","Detailed applicability: many models and a long list of specific serial numbers to check.","Time-bound compliance window tied to flight hours or next maintenance release, creating scheduling obligations for operators.","Dependence on an external manufacturer service instruction for the substantive work (delegates technical detail to Cessna).","Reference to FAA AD for background but primary direction is local (simple cross-reference rather than complex harmonisation)."],"plain_english_summary":"**What it does:** This airworthiness directive requires owners/operators of specified Cessna 170/172/175 series aircraft (identified by model and serial number) to inspect and, if needed, correct the aileron hinge pin arrangement by following Cessna Service Instruction SE83-18. The aim, as stated, is to prevent possible migration and loss of the hinge pin.\n\n**Who it affects and when:** Aircraft owners/operators pay for and arrange the inspection/modification. Compliance is required within 100 hours time-in-service after 31 January 1984 or at the next scheduled inspection for Maintenance Release after that date, whichever is later."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspection/repair of aileron hinge pins in affected Cessna models."},"complexity_factors":["Very short document (under 500 words)","Only 1 substantive requirement (comply with Cessna S.I.L. SE83-18)","Simple conditional logic for compliance deadline (whichever is later of two dates)","No defined terms section — uses plain technical aviation language","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998 and the referenced Cessna service bulletin","Tabular data for applicability is lengthy but mechanically simple (just a lookup table)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Cessna 170/172/F172/175-series aeroplanes (specific serial-numbered models listed) to follow Cessna Service Information Letter SE83‑18 because a misdrilled aileron hinge‑pin retaining hole can allow the hinge pin to migrate out. Compliance is mandatory by the later of 100 flight hours after 31 Jan 1984 or at the next Maintenance Release inspection. It addresses a critical flight‑control safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-170-50-aileron-hinge-pin","history":"/api/acts/ad-cessna-170-50-aileron-hinge-pin/history","analysis":"/api/acts/ad-cessna-170-50-aileron-hinge-pin/analysis","conflicts":"/api/acts/ad-cessna-170-50-aileron-hinge-pin/conflicts","importantCases":"/api/acts/ad-cessna-170-50-aileron-hinge-pin/important-cases","documents":"/api/acts/ad-cessna-170-50-aileron-hinge-pin/documents"}}