{"id":"F2006B05288","name":"AD/CESSNA 207/29 - Rear Wing Spar Doubler","slug":"ad-cessna-207-29-rear-wing-spar-doubler","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45692,"registerId":"commonwealth-F2006B05288-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 207/29 - 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 207 Series Aeroplanes\n\n \n\nAD/CESSNA 207/29 Rear Wing Spar Doubler 8/85\n\nApplicability: All model 207 with S/Nos 20700001 to 20700767 (1969 to 1983).\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. SEB 85-9.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"No change to scope is indicated in the instrument. The AD applies to the specified serial-number range and to aircraft that received replacement rear wing spars from Cessna Supply Division, and it requires actions set out in Cessna Service Bulletin SEB 85-9 within the stated compliance window."},"complexity_factors":["Narrow applicability by serial-number range (S/N 20700001–20700767) limits affected fleet and simplifies compliance identification.","Mandates execution of manufacturer service bulletin SEB 85-9 (Requirement), so regulators defer to manufacturer's technical procedure rather than prescribing new technical standards.","Fixed compliance window: within 100 hours TIS after 31 Aug 1985 or at next scheduled inspection, whichever is later (Compliance) — creates a clear but time-bound obligation.","Technical work involves structural modification (rear wing spar doubler) requiring qualified maintenance organisations and parts availability.","Hidden-condition origin: manufacturer suspects some replacement spars were shipped without doubler (Background), so the AD addresses a supply/installation defect rather than ongoing wear.","Administrative step: compliance may be recorded at the next Maintenance Release issue, adding a timing/record-keeping constraint."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Cessna 207 aeroplanes (serials 20700001–20700767) whose rear wing spar was replaced using a part shipped from Cessna Supply Division to follow Cessna Service Bulletin SEB 85-9 to inspect and, if necessary, fit a rear wing spar doubler. Owners pay for the inspection and any repairs; certified maintenance organisations carry out the work to the manufacturer’s instructions, and compliance is due within 100 hours time-in-service after 31 August 1985 or at the next scheduled inspection, whichever is later."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1985 addressing a specific manufacturing defect. It has not expanded beyond its original purpose of ensuring rear wing spar doublers are present on affected Cessna 207 aircraft. The scope remains tightly constrained to the identified airworthiness issue."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 4 defined elements: applicability range, compliance timeframe, reference to external document (Cessna S.B. SEB 85-9), and specific aircraft serial numbers","Single straightforward requirement with no nested conditions or exceptions","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Simple temporal compliance formula (whichever is later of two dates)","No subordinate legislation, delegated powers, or administrative procedures"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of specific Cessna 207 aircraft to inspect and fix a potential defect in the rear wing spar (a critical structural component that helps hold the wing to the fuselage).\n\n**The problem:**\nCessna suspects some replacement rear wing spars were shipped from their supply division **missing a 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**Who it affects:**\n- **Aircraft:** All Cessna Model 207 planes with serial numbers 20700001 through 20700767 (manufactured 1969–1983)\n- **Specifically:** Both normally aspirated and turbocharged models that have had their rear wing spar replaced with a part from Cessna's Supply Division\n\n**What must be done:**\nFollow the instructions in **Cessna Service Bulletin SEB 85-9** (the manufacturer's official repair guide for this issue).\n\n**When it must be done:**\nWithin **100 hours of flight time** after 31 August 1985, **or** at the next scheduled inspection for issuing a Maintenance Release (whichever comes later). A Maintenance Release is basically a certificate that says an aircraft is safe to fly — similar to a car's roadworthy certificate.\n\n**Why it matters:**\nWing spar failures can be catastrophic. This directive prevents potential structural failure by ensuring a critical reinforcing component is present on affected aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-207-29-rear-wing-spar-doubler","history":"/api/acts/ad-cessna-207-29-rear-wing-spar-doubler/history","analysis":"/api/acts/ad-cessna-207-29-rear-wing-spar-doubler/analysis","conflicts":"/api/acts/ad-cessna-207-29-rear-wing-spar-doubler/conflicts","importantCases":"/api/acts/ad-cessna-207-29-rear-wing-spar-doubler/important-cases","documents":"/api/acts/ad-cessna-207-29-rear-wing-spar-doubler/documents"}}