{"id":"F2006B05304","name":"AD/CESSNA 208/1 Amdt 1 - Fuel Selector Off Warning System","slug":"ad-cessna-208-1-amdt-1-fuel-selector-off-warning-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45726,"registerId":"commonwealth-F2006B05304-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 208/1 Amdt 1 - Fuel Selector Off Warning System","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 208 Series Aeroplanes\n\nAD/CESSNA 208/1\n\nAmdt 1\n\n  \nFuel Selector Off Warning System 1/87\n\nApplicability: All Cessna Caravan I models 208/208A, serial numbers 20800001 through 20800105\\. Requirement: Action in accordance with:\n\n    Cessna S.B. CAB 86-8.\n\n    2. Cessna S.B. CAB 86-26.\n\nNote: FAA AD 86-22-06 refers.\n\nCompliance: Unless already accomplished, prior to the issue of the next Maintenance Release after 28 February 1987.\n\nBackground: 1. Accident investigations in the U.S.A. have revealed fuel starvation during take-off due to improper positioning of fuel tank selectors. Consequently a warning system has been designed which indicates to the pilot fuel tank selector position and fuel tank low level condition, and provides a more appropriate level of safety in respect of turbine engine fuel system design requirements.\n\n2. This amendment adds S.B. CAB 86-26 to improve the integrity of the low fuel level warning system, by the addition of a lock washer and sealant to ensure transmitter nut retention.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The amendment expands the original directive by adding Cessna Service Bulletin CAB 86‑26 to CAB 86‑8. The change specifically requires an additional mechanical retention measure (lock washer and sealant) for the low‑fuel transmitter nut, increasing the directive's focus from installation of a warning system to include improved hardware retention."},"complexity_factors":["Narrow applicability: single aircraft type and limited serial‑number range (Cessna 208/208A, 20800001–20800105).","Dependence on external documents: compliance requires following two Cessna service bulletins (CAB 86‑8 and CAB 86‑26).","Technical maintenance action: installation/inspection of fuel‑system warning equipment and mechanical securing of transmitter nut (requires qualified maintenance personnel).","Fixed, near‑term compliance deadline tied to the next Maintenance Release after 28 Feb 1987.","Operational paperwork: work must be recorded as part of aircraft maintenance release.","Regulatory cross‑reference: note referring to an FAA AD adds an external regulatory touchpoint for operators."],"plain_english_summary":"Requires Cessna Caravan I aeroplanes (208/208A, serial numbers 20800001–20800105) to be modified or inspected in accordance with two Cessna service bulletins so a fuel‑selector‑off and low‑fuel warning system is fitted and the low‑level transmitter is secured. The rule is intended to reduce take‑off fuel starvation by showing selector position and low fuel; this amendment adds a lock washer and sealant to improve transmitter nut retention. Owners/operators must arrange and pay for the work before the next Maintenance Release after 28 February 1987."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical airworthiness directive focused on a specific safety modification for a limited aircraft fleet. Amendment 1 slightly expanded the technical requirements (adding S.B. CAB 86-26) but did not broaden the scope beyond the original purpose of preventing fuel starvation accidents."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability criteria (model numbers and serial number range)","Simple binary compliance requirement (do the work by the deadline or already done)","No nested exceptions or conditional logic","Only 2 cross-references (to Cessna Service Bulletins and one FAA AD)","Single amendment adding one additional service bulletin requirement"],"plain_english_summary":"This CASA Airworthiness Directive mandates that owners/operators of early Cessna Caravan I aeroplanes (models 208/208A, serials 20800001–20800105) install a fuel selector off warning system to prevent fuel starvation during take‑off. Licensed maintenance engineers must carry out the work per Cessna Service Bulletins CAB 86‑8 and CAB 86‑26 (the latter adds a locking washer/sealant).\n\nThe modification was required before the aircraft’s next Maintenance Release after 28 February 1987."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-208-1-amdt-1-fuel-selector-off-warning-system","history":"/api/acts/ad-cessna-208-1-amdt-1-fuel-selector-off-warning-system/history","analysis":"/api/acts/ad-cessna-208-1-amdt-1-fuel-selector-off-warning-system/analysis","conflicts":"/api/acts/ad-cessna-208-1-amdt-1-fuel-selector-off-warning-system/conflicts","importantCases":"/api/acts/ad-cessna-208-1-amdt-1-fuel-selector-off-warning-system/important-cases","documents":"/api/acts/ad-cessna-208-1-amdt-1-fuel-selector-off-warning-system/documents"}}