{"id":"F2006B05125","name":"AD/CESSNA 185/34 - Fuel Cap Alignment Placard","slug":"ad-cessna-185-34-fuel-cap-alignment-placard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45154,"registerId":"commonwealth-F2006B05125-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 185/34 - Fuel Cap Alignment 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 185/34 Fuel Cap Alignment Placard 9/80\n\nApplicability: Model 185 with S/Nos. 632, 185-0001 to 185-1599 and 18501600 to 18503988. Requirement:               Action in accordance with Cessna SIL No. SE 80-59.\n\nCompliance: Within 100 hours time in service after 30 September 1980.\n\n \n\nBackground: Correct alignment of flush fitting type fuel caps is essential for efficient operation of the fuel tank secondary vent system.\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\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on fuel cap alignment placards for a narrow range of aircraft. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Single, unambiguous requirement (install placard per Cessna SIL SE 80-59)","No defined terms section","No cross-references to other legislation beyond the single Cessna document","Clear applicability criteria (specific serial number ranges)","Single compliance deadline with straightforward calculation (100 hours time in service after fixed date)","No exceptions, exemptions, or conditional logic","Extremely short document (under 150 words of substantive content)"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it requires:** Owners and operators of certain Cessna 185 aeroplanes must install a placard (a warning label) near the fuel caps. This placard reminds pilots and ground crew to align the flush-fitting fuel caps correctly when closing them.\n\n**Why it matters:** The Cessna 185 has a \"secondary vent system\" in its fuel tanks that only works properly if the fuel cap is aligned exactly right. If the cap is misaligned, the tank can't vent properly, which can cause fuel starvation, engine failure, or dangerous pressure build-up. This AD was issued after Cessna identified the problem in Service Information Letter SE 80-59.\n\n**Who must comply:** Anyone operating a Cessna 185 with serial numbers 632, 185-0001 through 185-1599, or 18501600 through 18503988.\n\n**When:** The work had to be done within 100 hours of flight time after 30 September 1980.\n\n**In short:** A simple, one-off safety fix — bolt on a sticker to prevent potentially catastrophic fuel system failures."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied text sets a specific, narrowly targeted requirement for a defined set of Cessna 185 serial numbers and delegates the technical procedure to Cessna SIL No. SE 80-59. There is no indication in the instrument that the applicability, required action, or compliance timeframe were altered from any earlier statement within the supplied text."},"complexity_factors":["Narrow technical scope limited to specific model and serial-number ranges (Applicability)","Mandates compliance with an external technical document (Cessna SIL No. SE 80-59) rather than containing technical steps itself (Requirement)","Fixed compliance deadline expressed as flight‑time (100 hours time in service after 30 Sep 1980) which requires scheduling into maintenance programmes (Compliance)","Regulatory form (an Airworthiness Directive under Part 39) creates mandatory legal effect despite brevity (header)","Technical subject matter (fuel-cap alignment and vent system performance) requires qualified maintenance personnel to perform and verify work (Background)"],"plain_english_summary":"This Airworthiness Directive mandates that owners/operators of specified Cessna 185 serial numbers carry out the maintenance action set out in Cessna Service Information Letter SE 80-59—namely placard/alignment of flush‑fitting fuel caps—to ensure correct fuel tank secondary vent function. Compliance is mandatory within 100 hours time in service after 30 September 1980; costs and performance responsibility rest with the aircraft owners/operators or their maintenance providers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-185-34-fuel-cap-alignment-placard","history":"/api/acts/ad-cessna-185-34-fuel-cap-alignment-placard/history","analysis":"/api/acts/ad-cessna-185-34-fuel-cap-alignment-placard/analysis","conflicts":"/api/acts/ad-cessna-185-34-fuel-cap-alignment-placard/conflicts","importantCases":"/api/acts/ad-cessna-185-34-fuel-cap-alignment-placard/important-cases","documents":"/api/acts/ad-cessna-185-34-fuel-cap-alignment-placard/documents"}}