{"id":"F2006B05246","name":"AD/CESSNA 206/41 - Rear Wing Spar Doubler","slug":"ad-cessna-206-41-rear-wing-spar-doubler","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45560,"registerId":"commonwealth-F2006B05246-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 206/41 - Rear Wing Spar Doubler","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 206 Series Aeroplanes\n\n \n\nAD/CESSNA 206/41 Rear Wing Spar Doubler 8/85\n\nApplicability: All Model U206 with S/Nos U20601701 to U20604649 (1972 to 1978).\n\n \n\n(Normally aspirated and turbocharged models which have had a rear wing spar replaced with one shipped from Cessna Supply Division).\n\n \n\nRequirement: Action in accordance with Cessna S.B. SEB85-9.\n\n \n\nCompliance: Within 100 hours time in service after 31 August 1985 or at the next scheduled inspection for Maintenance Release issue after 31 August 1985 whichever is the later.\n\n \n\nBackground: The manufacturer suspects that a quantity of spare rear wing spar assemblies may have been shipped from the Cessna Supply Division without a doubler installed near the attach fitting.\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":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted Airworthiness Directive addressing a specific manufacturing defect in a defined aircraft population. It has not expanded beyond its original purpose of mandating inspection/repair of potentially defective wing spars."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 3 defined elements: applicability range, compliance timeframe, and referenced technical document (Cessna S.B. SEB85-9)","No nested conditional logic — simple 'if applicable, then comply' structure","Single cross-reference to external manufacturer document (Cessna Service Bulletin)","Clear, unambiguous compliance deadline with simple alternative trigger (100 hours OR next inspection)","No exceptions, exemptions, or sub-delegations"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance action on certain aircraft.\n\n**What it does:**\nOrders owners and operators of specific Cessna 206 aeroplanes to inspect and fix a potential defect in the rear wing spar (a structural component that helps hold the wing to the fuselage).\n\n**Who it affects:**\n- **Aircraft:** Model U206 Cessna aeroplanes with serial numbers U20601701 through U20604649 (manufactured 1972–1978)\n- **Specific condition:** Only those that have had their rear wing spar replaced with a spare part shipped from Cessna's Supply Division\n- **Both types:** Normally aspirated (standard engine) and turbocharged models\n\n**The problem:**\nCessna suspected that some replacement rear wing spars were shipped from their supply warehouse **missing a critical reinforcing plate** (called a \"doubler\") near where the wing attaches to the plane. This doubler is essential for structural integrity — without it, the wing attachment could be compromised.\n\n**What must be done:**\nFollow the instructions in **Cessna Service Bulletin SEB85-9** (a technical document from the manufacturer detailing the inspection and repair procedure).\n\n**When it must be done:**\nWithin **100 hours of flying time** after 31 August 1985, **OR** at the next scheduled inspection for issuing a Maintenance Release (a certificate allowing the aircraft to fly) — whichever comes later.\n\n**Why it matters:**\nThis is a **mandatory safety fix**. Non-compliance means the aircraft cannot legally fly in Australia. Wing spar failures can be catastrophic, so this directive prevents potential structural failure that could lead to loss of the aircraft and lives."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument itself states its applicability and required action; there is no text indicating a change from an earlier scope. It applies to the listed serial numbers, requires compliance with Cessna S.B. SEB85-9, and sets the 100‑hour/next‑inspection compliance window (Applicability, Requirement, Compliance)."},"complexity_factors":["Narrow technical scope: applies only to Model U206 serial numbers U20601701–U20604649 (Applicability).","Targets a specific part condition — rear wing spars that may have been shipped without a doubler (Background).","Mandates work 'in accordance with Cessna S.B. SEB85-9', creating dependency on an external service bulletin for procedural detail (Requirement).","Fixed compliance timing: within 100 hours TIS after 31 August 1985 or at next scheduled maintenance release, whichever is later (Compliance).","Compliance and inspection/repair costs and actions fall to aircraft owners/operators and their maintenance organisations (Requirement/Compliance).","Issued as an AD (Civil Aviation Safety Authority): the directive is mandatory with limited regulatory discretion in the text."],"plain_english_summary":"This airworthiness directive tells owners/operators of specified Cessna U206 aeroplanes (serial numbers U20601701–U20604649, 1972–1978) to inspect and, if needed, fit a rear wing spar doubler following Cessna Service Bulletin SEB85‑9. Compliance is required within 100 hours time in service after 31 August 1985 or at the next scheduled maintenance release after that date. The manufacturer suspects some replacement spars were shipped without the doubler."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-206-41-rear-wing-spar-doubler","history":"/api/acts/ad-cessna-206-41-rear-wing-spar-doubler/history","analysis":"/api/acts/ad-cessna-206-41-rear-wing-spar-doubler/analysis","conflicts":"/api/acts/ad-cessna-206-41-rear-wing-spar-doubler/conflicts","importantCases":"/api/acts/ad-cessna-206-41-rear-wing-spar-doubler/important-cases","documents":"/api/acts/ad-cessna-206-41-rear-wing-spar-doubler/documents"}}