{"id":"F2006B05233","name":"AD/CESSNA 206/29 - Fuel Flow Stabilisation Placard","slug":"ad-cessna-206-29-fuel-flow-stabilisation-placard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45519,"registerId":"commonwealth-F2006B05233-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 206/29 - Fuel Flow Stabilisation Placard","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 206 Series Aeroplanes\n\nAD/CESSNA 206/29 Fuel Flow Stabilisation Placard 10/79\n\nApplicability: Model 206 with S/Nos. 206-0001 to 206-0136 (with SK206-2 Installed) and 206-\n\n0138 to 206-0275.\n\nModel U206 with S/Nos. U206-0276 to U206-04287, 04289, 04290, 04292 to 04335,\n\n04337 to 04389, 04391 to 04787, 04789 to 04894, 04896 to 04906, 04908 to 04911,\n\n04913 to 04958, 04960 to 04963, 04965 to 04973, 04975 to 04977, 04980 to 04985,\n\n04987 to 04990, 04992, 04993, 04995 to 04998, 05000 to 05018, 05020 to 05058,\n\n05060, 05061, 05063, 05066, 05069, 05071 to 05073, 05075, 05077, 05078, 05083,\n\n05085, 05086, 05088, 05095, 05097, 05100, 05102, 05105, 05107 and 05110.\n\nModel P206 with S/Nos. P206-0001 to P20600647.\n\nRequirement: Action in accordance with Cessna SIL No. SE79-25, Supplement No. 1.\n\nNote: FAA AD 79-15-01, Amendment 39-3517 refers.\n\nCompliance: Within 100 hours time in service after 31 October 1979.\n\nBackground: The manufacturer has made placards and instructions available to aid in the recognition and elimination of excessive vapour from the aircraft fuel system. In the event of inflight power interruptions engine restart procedures are also detailed.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope is limited to specified models and serial numbers and requires placarding plus adherence to the manufacturer's service instruction within a set time. The instrument does not indicate any expansion or narrowing of that scope beyond the listed applicability and stated compliance requirements (Applicability; Requirement; Compliance)."},"complexity_factors":["Long, specific serial‑number applicability list requiring operators to check individual airframe eligibility (Applicability).","Mandated compliance deadline tied to flight hours after a calendar date, adding scheduling pressure (Compliance).","Primary action delegates technical detail to a manufacturer service instruction (Cessna SIL SE79‑25, Supplement No.1) rather than prescribing technical steps in the AD itself (Requirement).","Reference to related FAA AD for background/consistency increases cross‑jurisdictional traceability (Note / Background).","The mandated change is limited in scope (placards and procedures), so technical implementation and cost per airframe are low, reducing operational complexity (Background)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Cessna 206, U206 and P206 aircraft (listed by serial number) to fit a fuel‑flow stabilisation placard and follow Cessna Service Instruction Letter SE79‑25 Supplement No.1 addressing fuel vapour and engine‑restart procedures. The work must be done within 100 hours' time in service after 31 October 1979. It changes operating and maintenance obligations for the affected aircraft to reduce in‑flight power interruptions linked to fuel vapour, by mandating placarding and procedural compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused specifically on fuel system placarding for a narrow range of aircraft. It has not expanded beyond its original purpose of addressing fuel vapour issues in early Cessna 206 models."},"complexity_factors":["Very short document (under 300 words)","Only one substantive requirement: follow an external document (Cessna SIL No. SE79-25)","Applicability defined by specific serial number ranges rather than general descriptions — requires cross-checking but is mechanically simple","No defined terms section","No nested conditional logic or exceptions","Single compliance deadline with straightforward calculation (100 hours time in service after fixed date)","Background section provides context but creates no additional legal obligations"],"plain_english_summary":"This CASA Airworthiness Directive required owners/operators of specific Cessna 206/U206/P206 aircraft to install a warning placard and follow Cessna Service Information Letter SE79‑25, Supplement No.1 about fuel‑flow stabilisation. It targeted planes susceptible to fuel vapour bubbles that can cause in‑flight engine cut‑outs, and prescribed recognition and restart procedures. The compliance deadline (100 flight hours after 31 Oct 1979) has long passed; the AD remains as the historical safety requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-206-29-fuel-flow-stabilisation-placard","history":"/api/acts/ad-cessna-206-29-fuel-flow-stabilisation-placard/history","analysis":"/api/acts/ad-cessna-206-29-fuel-flow-stabilisation-placard/analysis","conflicts":"/api/acts/ad-cessna-206-29-fuel-flow-stabilisation-placard/conflicts","importantCases":"/api/acts/ad-cessna-206-29-fuel-flow-stabilisation-placard/important-cases","documents":"/api/acts/ad-cessna-206-29-fuel-flow-stabilisation-placard/documents"}}