{"id":"F2006B05285","name":"AD/CESSNA 207/26 Amdt 1 - Bladder Type Fuel Cells","slug":"ad-cessna-207-26-amdt-1-bladder-type-fuel-cells","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45681,"registerId":"commonwealth-F2006B05285-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 207/26 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 207 Series Aeroplanes\n\nAD/CESSNA 207/26\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,\n\nRev 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 statement requirement 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":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive. The background indicates the amendment removed the fuel cap testing requirement (moving it to a separate directive) and added log book statement requirements, but the core scope—addressing bladder fuel cell safety in Cessna 207 aircraft—remains consistent with the original directive."},"complexity_factors":["Multiple compliance pathways based on modification status (modified vs unmodified aircraft)","Cross-references to external Cessna documents (SIL SE 84-4, SIL SE 84-9 Rev 1, Owner Advisory SE 82-36A) not reproduced in the directive","Time-based compliance triggers (specific dates in 1984 and 1985)","Conditional ongoing obligations (repeat purging only for cells that exhibited wrinkles/folds)","Amendment structure requiring reference to previous issue for transitional compliance"],"plain_english_summary":"This Airworthiness Directive requires owners/operators and maintenance personnel of affected Cessna 207s to inspect bladder-type fuel cells for wrinkles or folds using the referenced Cessna service instruction. If defects are found, the fuel system must be purged to remove moisture/contaminants, and results recorded in the aircraft logbook.\n\nThe rule addresses contamination risks that can lead to engine failure, so timely inspection and corrective action are mandatory."},"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":4,"scope_assessment":{"changed":true,"description":"The Directive changes scope compared with the prior issue by removing the fuel cap testing requirement and delegating it to a separate Directive, while adding mandatory log‑book statements and publishing the latest revision of Cessna SIL SE 84-9 (Background). Mechanically, it narrows one testing obligation (fuel cap) but expands administrative and procedural obligations (inspection records, recurring purging and reliance on revised SIL guidance) (Requirement; Compliance; Background)."},"complexity_factors":["Cross-references multiple external Cessna documents (SIL SE 84-4, SIL SE 84-9 Rev 1, Owner Advisory SE 82-36A) rather than setting all procedures in the Directive itself (Requirement; Note).","Conditional compliance paths depending on modification status under SIL SE 84-9 Rev 1 introduce branching obligations (Compliance 1–2).","Prescriptive operational actions (inspect; purge) coupled with subjective condition triggers (‘wrinkles or folds’) create potential ambiguity for inspectors (Requirement).","Recurring compliance for affected cells at each Maintenance Release increases ongoing administrative burden (Compliance 1).","Explicit log‑book statement timing and retroactive compliance for previously compliant aircraft add discrete deadlines (Compliance 3).","Removal of a previously included fuel cap testing requirement and referral to a separate directive changes where obligations sit, requiring operators to track multiple directives for complete compliance (Background)."],"plain_english_summary":"This directive requires inspection of bladder-type fuel cells on listed Cessna 207 aeroplanes and a log‑book entry recording the result. If fuel cells show wrinkles or folds, maintenance must purge the fuel system of moisture or contaminants; additional purging may be required at each Maintenance Release for affected cells. Compliance timing differs depending on whether the aircraft was modified under Cessna SIL SE 84-9 Rev 1. It affects aircraft owners, operators and maintenance personnel responsible for airworthiness and record-keeping."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-207-26-amdt-1-bladder-type-fuel-cells","history":"/api/acts/ad-cessna-207-26-amdt-1-bladder-type-fuel-cells/history","analysis":"/api/acts/ad-cessna-207-26-amdt-1-bladder-type-fuel-cells/analysis","conflicts":"/api/acts/ad-cessna-207-26-amdt-1-bladder-type-fuel-cells/conflicts","importantCases":"/api/acts/ad-cessna-207-26-amdt-1-bladder-type-fuel-cells/important-cases","documents":"/api/acts/ad-cessna-207-26-amdt-1-bladder-type-fuel-cells/documents"}}