{"id":"F2006B05079","name":"AD/CESSNA 180/67 - Aileron Balance Weight","slug":"ad-cessna-180-67-aileron-balance-weight","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44989,"registerId":"commonwealth-F2006B05079-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 180/67 - Aileron Balance Weight","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 180, 182 and Wren 460 Series Aeroplanes\n\nAD/CESSNA 180/67 Aileron Balance Weight 1/84\n\nApplicability: All models 180 thru 180H, 180J and 180K aircraft modified in accordance with Robertson STC SA 1435WE and all models 182 thru 182R, R182, T182 and TR182 aircraft modified in accordance with Robertson STC SA 1382WE.\n\nRequirement: 1. Determine if the aircraft has been modified in accordance with the applicable STC at Robertson Aircraft Corporation repair station No. 415-23 prior to 1 August 1983, and if so proceed with the inspection requirement.\n\n    2. Measure the height of all aileron balance weights. If the measured height of all weights is approximately 3/4 inch, the weights are correctly installed and no further action is necessary.\n\n    3. Any weight with a measured height of approximately 1/2 inch, requires replacement before further flight with balance weights of the appropriate part number in accordance with the applicable STC data or Robertson SB No. 20. Rebalance the ailerons within the limits specified by the Cessna Aircraft Company Service Manual for the aircraft involved.\n\nCompliance: Within 50 hours time in service after 31 January 1983.\n\nBackground: Failure to comply with the intent of this Directive could result in destructive aileron flutter.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Scope is targeted to aircraft modified under Robertson STC SA 1435WE or SA 1382WE and requires inspection/replacement only for those modified aircraft (Applicability; Requirements 1–3). The instrument does not broaden applicability beyond the named STC-modified models and remains focused on preventing aileron flutter (Background)."},"complexity_factors":["Narrow applicability tied to specific Robertson STCs (Applicability) — requires operators to verify modification records and repair-station work before 1 August 1983 (Requirement 1).","Measurement-based pass/fail with informal tolerance language ('approximately') creates operator judgment calls during inspection (Requirement 2).","Mandated replacement and rebalancing refer to external documents (applicable STC data, Robertson SB No.20, Cessna Service Manual), increasing cross-reference and compliance burden (Requirement 3).","Short compliance window (within 50 hours time in service after 31 January 1983) can force rapid scheduling of maintenance and potential aircraft downtime (Compliance).","Safety consequence (destructive aileron flutter) raises the operational priority and potential cost of non-compliance (Background).","Costs fall on aircraft owners/operators: inspection labour, possible purchase/installation of specified balance weights and rebalancing work (Requirements 2–3)."],"plain_english_summary":"This airworthiness directive requires owners/operators of certain Cessna 180/182 and Wren 460 aeroplanes modified under specified Robertson STCs to inspect aileron balance weights within 50 flight-hours. Weights about 3/4 inch are acceptable; weights about 1/2 inch must be replaced and the ailerons rebalanced per the STC, Robertson SB No. 20 or the Cessna Service Manual. The directive aims to prevent destructive aileron flutter and imposes inspection, parts and maintenance costs on operators."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"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 correcting aileron balance weight installations from a particular modification shop during a specific timeframe."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined applicability criteria (aircraft models, STC numbers, repair station number)","Simple conditional logic: if-then structure with clear measurement threshold (3/4 inch vs 1/2 inch)","Single compliance deadline with straightforward calculation (50 hours after fixed date)","No cross-references to other legislation or regulations beyond naming the enabling regulations (CAR 1998 Part 39)","No nested exceptions or sub-delegations"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of Cessna 180, 182 and Wren 460 series aircraft modified under Robertson Aircraft Corp STC at repair station No. 415-23 before 1 Aug 1983 to inspect aileron balance weights and replace undersized ones to prevent dangerous aileron flutter. Compliance was required within 50 flight hours after 31 Jan 1983; the rule addresses a historical but safety-critical risk of wing/aileron failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-180-67-aileron-balance-weight","history":"/api/acts/ad-cessna-180-67-aileron-balance-weight/history","analysis":"/api/acts/ad-cessna-180-67-aileron-balance-weight/analysis","conflicts":"/api/acts/ad-cessna-180-67-aileron-balance-weight/conflicts","importantCases":"/api/acts/ad-cessna-180-67-aileron-balance-weight/important-cases","documents":"/api/acts/ad-cessna-180-67-aileron-balance-weight/documents"}}