{"id":"F2006B05113","name":"AD/CESSNA 185/22 - Fuel Quantity Placard","slug":"ad-cessna-185-22-fuel-quantity-placard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45109,"registerId":"commonwealth-F2006B05113-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 185/22 - Fuel Quantity Placard","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Cessna 185 Series Aeroplanes\n\n \n\nAD/CESSNA 185/22 Fuel Quantity Placard 4/76\n\nApplicability: As detailed in the Requirement Document.\n\n \n\nRequirement: Install fuel quantity placards as detailed in Cessna SL SE75-7 and Supplement No. 1.\n\n \n\nCompliance: 1. Model 185 with S/Nos. as detailed in Cessna SL SE75-7: within 100 hours time in service after 16 April 1976.\n\n \n\n2.    Model 185 with S/Nos. prior to 02263:\n\n \n\n1. If currently fitted with one or more replacement fuel cells bearing a manufacturing date of June 1973 or later - within 100 hours time in service after 16 April 1976.\n\n\n \n\nb.   Concurrent with fitting one or more replacement fuel cells bearing a manufacturing date of June 1973 or later.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The source text prescribes applicability and compliance instructions tied to serial numbers and fuel-cell manufacturing dates and sets deadlines. The text contains no indication that the scope has been altered from an earlier intent; the AD defines the affected population and timing as its operative scope (Applicability; Requirement; Compliance)."},"complexity_factors":["Relies on external documents for details (Requirement: Cessna SL SE75-7 and Supplement No. 1; Applicability: Requirement Document)","Multiple applicability categories (serial-number lists; serial numbers prior to 02263)","Conditional compliance tied to replacement fuel-cell manufacturing date (June 1973 or later) (Compliance: 2.a, 2.b)","Fixed compliance timing relative to a historical reference date (100 hours TIS after 16 April 1976) (Compliance: 1., 2.a)"],"plain_english_summary":"What this rule changes, mechanically\n\n- Requires installation of fuel quantity placards on Cessna 185 series aeroplanes, following the details in Cessna Service Letter SE75-7 and its Supplement No. 1 (Requirement: “Install fuel quantity placards as detailed in Cessna SL SE75-7 and Supplement No. 1”).\n\nWho it affects and the deadlines\n\n- Affected parties are owners/operators of Cessna 185 aircraft identified by serial numbers in the Requirement Document (Applicability: “As detailed in the Requirement Document”).\n- For the models and serial numbers listed in that Requirement Document, the placards must be installed within 100 hours time in service after 16 April 1976 (Compliance: 1.).\n- For Model 185 aircraft with serial numbers prior to 02263: if they currently have one or more replacement fuel cells that show a manufacturing date of June 1973 or later, they must have the placards installed within 100 hours time in service after 16 April 1976 (Compliance: 2.a). If such replacement fuel cells are fitted in the future, the placards must be fitted at the same time as the cell installation (Compliance: 2.b).\n\nStated purpose and how it operates in practice\n\n- The document directs operators to fit placards specifying fuel quantity, by reference to a manufacturer service letter. That is the explicit mechanical requirement (Requirement and referenced service letter).\n- The source does not include a narrative justification in this text; it prescribes the action, the technical reference (Cessna SL SE75-7 and Supplement No. 1), the specific serial-numbered population (Requirement Document), and precise timing for compliance (Compliance: 1., 2.a, 2.b).\n\nWho pays, who decides, and what behaviour changes\n\n- Who pays: aircraft owners or operators pay for acquiring and fitting the placard and any associated labour because the directive requires the installation on the affected aircraft (Requirement; Compliance sections).\n- Who decides: the regulator sets the requirement and defines which serial numbers are affected via the Requirement Document (Applicability). The detailed appearance and placement of the placard are determined by the referenced Cessna service letter (Requirement: Cessna SL SE75-7 and Supplement No. 1).\n- Behavioural change required: operators must inspect aircraft serial numbers and replacement fuel-cell manufacturing dates where relevant, then fit the placard within the stated deadlines or at the same time as fitting qualifying replacement cells (Compliance: 1., 2.a, 2.b).\n\nCosts, incentives, trade-offs, and practical risks\n\n- Costs: the directive imposes a direct compliance cost on owners/operators for the placard and installation labour; the source does not quantify the cost (Requirement; Compliance).\n- Incentives: operators who plan to fit replacement fuel cells with manufacturing dates of June 1973 or later are required to fit the placard at the same time, which creates an operational coupling between maintenance events and the placard requirement (Compliance: 2.b). That creates an incentive to schedule the placard installation with other maintenance to limit additional downtime.\n- Trade-offs and opportunity cost: operators must use maintenance hours to meet the 100-hour deadline or coordinate the placard fit with replacement-cell work. The rule shifts a small compliance task onto private operators and maintenance providers (Compliance: 1., 2.a, 2.b).\n- Implementation risk and areas needing clarification: compliance depends on identifying affected serial numbers (Applicability) and determining fuel-cell manufacturing dates (Compliance: 2.a/2.b). Operators must consult the Requirement Document and the Cessna service letter to apply the rule correctly; ambiguity in those external documents would raise practical compliance risk (Applicability; Requirement). The AD itself does not state enforcement measures or fees.\n\nNet, mechanically: specific Cessna 185 aircraft (as listed externally) must have a fuel quantity placard fitted according to a Cessna service letter within specified time windows tied to a 16 April 1976 reference date, with special timing rules when certain replacement fuel cells are fitted (Requirement; Applicability; Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound airworthiness directive from 1976 addressing a specific safety issue (fuel placarding after fuel cell modifications). It has not expanded beyond its original narrow purpose of ensuring accurate fuel quantity indication for modified Cessna 185 aircraft."},"complexity_factors":["Short, single-purpose directive with narrow applicability","Only 2 defined compliance pathways based on serial number and fuel cell manufacturing date","Heavy reliance on external documents (Cessna SL SE75-7 and Supplement No. 1) for actual technical requirements — the directive itself doesn't specify what the placards must say","Simple conditional logic (if/then based on serial numbers and fuel cell dates)","No nested exceptions or complex cross-referencing within the instrument itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nRequires owners and operators of certain **Cessna 185 series aeroplanes** to install new **fuel quantity placards** (labels showing how much fuel the tanks hold). These placards must match the specifications in a Cessna Service Letter (SL SE75-7) and its Supplement No. 1.\n\n**Who it affects:**\n- Cessna 185 aircraft with specific serial numbers listed in the service letter\n- Cessna 185 aircraft with serial numbers before 02263, but only if they have replacement fuel cells made in June 1973 or later\n\n**When it must be done:**\n- For aircraft listed in the service letter: within **100 hours of flying time** after 16 April 1976\n- For older aircraft (pre-serial 02263) with newer fuel cells: same 100-hour deadline, OR immediately when fitting such fuel cells in the future\n\n**Why it matters:**\nIncorrect fuel quantity markings can lead to pilots miscalculating fuel loads, potentially causing fuel exhaustion and accidents. This directive ensures pilots have accurate information about fuel capacity after certain maintenance modifications."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-185-22-fuel-quantity-placard","history":"/api/acts/ad-cessna-185-22-fuel-quantity-placard/history","analysis":"/api/acts/ad-cessna-185-22-fuel-quantity-placard/analysis","conflicts":"/api/acts/ad-cessna-185-22-fuel-quantity-placard/conflicts","importantCases":"/api/acts/ad-cessna-185-22-fuel-quantity-placard/important-cases","documents":"/api/acts/ad-cessna-185-22-fuel-quantity-placard/documents"}}