{"id":"F2006B05130","name":"AD/CESSNA 185/39 Amdt 1 - Bladder Type Fuel Cells","slug":"ad-cessna-185-39-amdt-1-bladder-type-fuel-cells","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45173,"registerId":"commonwealth-F2006B05130-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 185/39 Amdt 1 - Bladder Type Fuel Cells","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 185 Series Aeroplanes\n\nAD/CESSNA 185/39\n\nAmdt 1\n\n  \nBladder Type Fuel Cells 6/85\n\nApplicability: All models with S/Nos as listed in Cessna SIL SE 84-4.\n\nRequirement: Inspect fuel cells in accordance with Cessna SIL SE 84-4 and record the result in the aircraft log book. Where cells exhibit wrinkles or folds, purge fuel system of moisture or other contaminants.\n\nNote: Additional information on fuel system purging is contained in Cessna Owner Advisory SE 82-36A.\n\nCompliance: 1. Aircraft not modified in accordance with Cessna SIL SE 84-9, Rev. 1.\n\nInitially, before further flight after 31 August 1984 for cells currently fitted, and at installation of any cell after 31 August 1984. Thereafter, for cells that exhibited signs of unacceptable wrinkles or folds at initial inspection, repeat the system purging procedures at each issue of a new Maintenance Release.\n\n    2. Aircraft Modified in accordance with Cessna SIL SE 84-9, Rev. 1.\n\nWhen future cell replacement is required, carry out further SIL SE 84-9 Rev 1.\n\n    3. For aircraft that have complied with the previous issue of this Directive, the log book entry shall be made before the issue of the next Maintenance Release after 30 June 1985.\n\nBackground: This Directive promulgates the latest revision to Cessna SIL SE 84-9 containing “Helpful Hints” useful to maintenance personnel. The fuel cap testing requirement has been removed and now becomes the subject of a separate Directive. Editorial changes and a requirement for log book statements are also included.","sortOrder":0}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This Directive updates prior requirements by promulgating the latest revision to Cessna SIL SE 84-9 (adding maintenance 'Helpful Hints'), introducing mandatory log book statements, and removing the fuel-cap testing requirement (now handled by a separate Directive). It also distinguishes compliance for aircraft modified under SIL SE 84-9 Rev.1 versus unmodified aircraft and sets timing for initial and repeat actions."},"complexity_factors":["Cross-reference dependence: compliance actions are specified by external Cessna documents (SIL SE 84-4, SIL SE 84-9, Owner Advisory SE 82-36A), requiring access to and interpretation of those documents.","Differentiated compliance timing: separate rules for aircraft modified under Cessna SIL SE 84-9 Rev.1 versus unmodified aircraft (Compliance items 1 and 2).","Recurring action conditionality: if wrinkles/folds found, purging must be repeated at each new Maintenance Release (Compliance 1), creating ongoing recurring costs.","Record-keeping requirement: mandatory log book entries with a specified deadline for previously compliant aircraft (Compliance 3) add administrative burden.","Scope identification: applicability limited to serial numbers listed in the Cessna SIL, so operators must verify applicability against external lists.","Operational linkage: purging requirement may involve downtime, parts or labour costs and reliance on maintenance personnel following Cessna purging guidance (Owner Advisory).","Editorial and procedural changes: removal of fuel-cap testing and transfer to a separate Directive requires monitoring of additional ADs for full compliance."],"plain_english_summary":"In mechanical terms, the Directive requires inspection of bladder-type fuel cells on specified Cessna 185 serial numbers per Cessna SIL SE 84‑4, recording results in the aircraft logbook and purging the fuel system where wrinkles or folds are found. It applies to owners/operators and maintenance personnel of affected Cessna 185s, who bear inspection, purging and record-keeping costs. The Directive incorporates revisions to Cessna service information (SIL SE 84‑9), adds logbook requirements and removes fuel-cap testing (now addressed by a separate directive)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is an amendment (Amdt 1) that narrows and clarifies the original directive rather than expanding it. The background explicitly states the fuel cap testing requirement was removed to become a separate directive, and the changes are described as 'editorial' with added 'Helpful Hints' and log book requirements. The scope remains tightly focused on bladder fuel cell inspection and maintenance."},"complexity_factors":["Multiple compliance pathways based on aircraft modification status (3 separate categories)","Cross-references to external Cessna technical documents (SIL SE 84-4, SIL SE 84-9 Rev 1, SE 82-36A) not reproduced in the directive itself","Date-based triggering conditions for initial compliance and repeat actions","Conditional ongoing obligations ('thereafter' clauses dependent on initial inspection results)","Specific administrative requirement (log book entry) with its own deadline"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators and maintenance engineers of specified Cessna 185 serials to inspect wing fuel cells per Cessna SIL SE 84-4, purge the fuel system if wrinkles or folds are found, and record results in the aircraft logbook. It targets fuel-cell defects that can trap moisture/debris and contaminate fuel, risking engine failure. Time limits require initial inspections and follow-up purging or logbook updates around the cited 1984–1985 maintenance deadlines."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-185-39-amdt-1-bladder-type-fuel-cells","history":"/api/acts/ad-cessna-185-39-amdt-1-bladder-type-fuel-cells/history","analysis":"/api/acts/ad-cessna-185-39-amdt-1-bladder-type-fuel-cells/analysis","conflicts":"/api/acts/ad-cessna-185-39-amdt-1-bladder-type-fuel-cells/conflicts","importantCases":"/api/acts/ad-cessna-185-39-amdt-1-bladder-type-fuel-cells/important-cases","documents":"/api/acts/ad-cessna-185-39-amdt-1-bladder-type-fuel-cells/documents"}}