{"id":"F2006B08260","name":"AD/CESSNA 340/14 - Oxygen System - Cleaning","slug":"ad-cessna-340-14-oxygen-system-cleaning","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115565,"registerId":"commonwealth-F2006B08260-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 340/14 - Oxygen System - Cleaning","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 340 Series Aeroplanes\n\n \n\nAD/CESSNA 340/14 Oxygen System - Cleaning 6/77\n\nApplicability: All models with S/Nos. 340A0040 thru 340A0225, 340A0229 and 340A0230. Document:               1. Cessna SL ME77-3; or\n\n2. FAA AD 77-06-05.\n\n \n\nCompliance: Within 25 hours time in service after 9 March 1977.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive as presented applies only to the listed serial-numbered Cessna 340 aeroplanes and requires cleaning per the referenced documents within a specific 25‑hour window after 9 March 1977. The text contains no indication of an expanded or narrowed scope beyond those serial numbers or of amendments to that scope."},"complexity_factors":["Very narrow technical scope limited to specific serial-numbered aircraft (Applicability).","Short, fixed compliance window requiring near-term action (Compliance).","No procedural detail in the directive itself; it relies on external documents for the method (Document).","Legal form is an Airworthiness Directive under Part 39, which makes the requirement mandatory but does not describe enforcement steps in this text (Header).","Low administrative complexity because the action required is a single, one-off maintenance task rather than ongoing obligations (Compliance)."],"plain_english_summary":"This AD mandates cleaning the oxygen system on specified Cessna 340 serial numbers, to be completed per Cessna Service Letter ME77-3 or FAA AD 77-06-05 within 25 hours TIS after 9 March 1977. It directly affects the listed owners/operators and maintenance providers, creating short-term downtime and compliance costs while relying on the referenced procedures for how the work is done."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive from 1977. It has not expanded beyond its original narrow purpose of requiring oxygen system cleaning for specific Cessna aircraft. The scope remains exactly as originally intended — a targeted maintenance action for a defined fleet subset."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 3 defined elements: applicability (serial numbers), document references, and compliance deadline","No cross-references to other legislation beyond two external document citations","Single, unambiguous compliance action with clear deadline","No conditional logic, exceptions, or nested provisions","Straightforward applicability test based on aircraft serial numbers"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). ADs are legally binding instructions that aircraft owners and operators must follow to fix unsafe conditions in aircraft.\n\n**What it requires:** Owners of specific Cessna 340 series aeroplanes must clean their oxygen systems within 25 hours of flying time after 9 March 1977.\n\n**Who it affects:** This applies only to specific Cessna 340 aircraft with serial numbers between 340A0040 and 340A0225, plus two additional specific aircraft (340A0229 and 340A0230).\n\n**Why it matters:** Contaminated oxygen systems can be dangerous — they can cause fires or deliver unsafe breathing gas to pilots and passengers at altitude. This directive was issued to prevent those risks by ensuring proper cleaning procedures were followed.\n\n**How to comply:** Aircraft operators must follow either:\n- Cessna Service Letter ME77-3 (the manufacturer's instructions), OR\n- FAA AD 77-06-05 (the equivalent American safety order)\n\n**The bottom line:** If you owned one of these specific Cessna planes in 1977, you had a legal deadline to get your oxygen system cleaned using approved methods. This is now historical — the compliance deadline passed decades ago — but the directive remains on the books as part of Australia's aviation safety record."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-340-14-oxygen-system-cleaning","history":"/api/acts/ad-cessna-340-14-oxygen-system-cleaning/history","analysis":"/api/acts/ad-cessna-340-14-oxygen-system-cleaning/analysis","conflicts":"/api/acts/ad-cessna-340-14-oxygen-system-cleaning/conflicts","importantCases":"/api/acts/ad-cessna-340-14-oxygen-system-cleaning/important-cases","documents":"/api/acts/ad-cessna-340-14-oxygen-system-cleaning/documents"}}