{"id":"F2006B08426","name":"AD/CESSNA 550/20 - Drag Chute","slug":"ad-cessna-550-20-drag-chute","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115902,"registerId":"commonwealth-F2006B08426-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 550/20 - Drag Chute","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 550 (Citation II) Series Aeroplanes\n\n \n\nAD/CESSNA 550/20 Drag Chute 8/90\n\nApplicability: Model 550 series equipped with a drag chute system.\n\n \n\nRequirement: Incorporate the following information on the drag chute canister lid; with the letters being at least 13 mm in height and bordered in red: “DRAG CHUTE CANISTER LID - DO NOT SEAL EDGE.”\n\n \n\nNote: This information may be incorporated in the form of a placard, or alternatively by painted letters.\n\n \n\nCompliance: Prior to the issue of the next Maintenance Release after 31 August 1990.\n\n \n\nBackground: This AD is raised in response to an incident in which drag chute deployment was inhibited due to the application of sealant around the periphery of the drag chute canister lid.\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 safety directive addressing a specific mechanical failure mode. It has not expanded beyond its original purpose of preventing drag chute deployment failures due to improper sealing."},"complexity_factors":["Single, specific requirement with no conditional logic","No defined terms requiring interpretation","No cross-references to other legislation or regulations","Simple compliance deadline structure","Straightforward applicability test (Model 550 series with drag chute)","Background explanation included, reducing ambiguity"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety fix for aircraft. It applies to **Cessna 550 Citation II jets** that have a drag chute system (a parachute used to help slow the plane down on landing).\n\n**What it requires:**\n- Aircraft owners must add a warning label to the drag chute canister lid\n- The warning must read: **\"DRAG CHUTE CANISTER LID - DO NOT SEAL EDGE\"**\n- The text must be **at least 13 mm tall** and have a **red border**\n- This can be done with a placard (sticker/sign) or painted directly on the lid\n\n**Why it matters:**\nA drag chute failed to deploy in an incident because someone had sealed around the edge of the canister lid. This sealant prevented the chute from opening properly. The warning is designed to stop maintenance crews from making the same dangerous mistake.\n\n**Deadline:**\nThe fix had to be done before the aircraft's next **Maintenance Release** (a formal safety certificate) issued after 31 August 1990."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive introduces a focused, new marking requirement for affected Model 550 aircraft; the text does not indicate any change from an earlier scope or intent. It limits action to drag‑chute‑equipped 550s and prescribes how and when to comply (Applicability, Requirement, Compliance)."},"complexity_factors":["Narrow applicability: applies only to Model 550 series equipped with a drag chute system (Applicability).","Simple corrective action: a marking requirement (Requirement/Note) that may be a placard or painted letters.","Clear measurable specification: minimum letter height (13 mm) and red border reduce ambiguity (Requirement).","Definite compliance deadline tied to maintenance paperwork: before next Maintenance Release after 31 Aug 1990 (Compliance).","Low technical and implementation burden for maintainers; cost falls on aircraft operators/maintenance providers (Requirement/Compliance).","Safety-triggered origin: follows a specific incident where sealant inhibited deployment (Background)."],"plain_english_summary":"This airworthiness directive requires Cessna 550 aeroplanes fitted with a drag‑chute to have the canister lid marked: “DRAG CHUTE CANISTER LID - DO NOT SEAL EDGE” in letters at least 13 mm high with a red border, applied as a placard or painted. Compliance is required before the next Maintenance Release after 31 August 1990. The AD was issued after an incident where sealant around the lid prevented chute deployment and shifts a small compliance cost to operators/maintainers while creating a clear inspection cue."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-550-20-drag-chute","history":"/api/acts/ad-cessna-550-20-drag-chute/history","analysis":"/api/acts/ad-cessna-550-20-drag-chute/analysis","conflicts":"/api/acts/ad-cessna-550-20-drag-chute/conflicts","importantCases":"/api/acts/ad-cessna-550-20-drag-chute/important-cases","documents":"/api/acts/ad-cessna-550-20-drag-chute/documents"}}