{"id":"F2006B05308","name":"AD/CESSNA 208/15 - Wing Struts Upper Attachment Bolts","slug":"ad-cessna-208-15-wing-struts-upper-attachment-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45738,"registerId":"commonwealth-F2006B05308-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nCessna 208 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/CESSNA 208/15 Wing Struts Upper Attac","sectionType":"part","heading":"AD/CESSNA 208/15 Wing Struts Upper Attachment Bolts 7/2004","content":"# AD/CESSNA 208/15 Wing Struts Upper Attachment Bolts 7/2004\n\nDM\n\nApplicability: Model 208 aircraft, serial numbers 20800370 and 20800371.\n\nModel 208B aircraft, serial numbers 208B1034 through 208B1043, 208B1045, 208B1046, and 208B1048.\n\nRequirement: 1. Check that part number MS24665-360 cotter pin is installed on each part number MS 17826-14 nut on the upper wing strut attach fittings, and that part number MS24665-357 cotter pin is installed on each part number MS17826-12 nut on the lower wing strut attach fittings; in accordance with Cessna Special Service Project No. SSP04-2, dated 5 April 2004. The applicable aircraft maintenance manual also addresses the issue.\n\n    2. If any part number MS24665-360 or part number MS24665-357 cotter pin is not installed, refer to SSP04-2, and:\n\n    Tighten the corresponding nut, part number MS17826-14 or part number MS17826-12, align nut castellations and cotter pin hole; and,\n\n    b. Install the corresponding part number MS24665-360 or part number MS24665-357 cotter pin.\n\nNote: FAA AD 2004-08-17 Amdt 39-13587 refers.\n\nCompliance: 1. Within 10 hours time in service after 12 May 2004, unless already accomplished.\n\n2. Before further flight after the Requirement 1 inspection.\n\nThis Airworthiness Directive becomes effective on 12 May 2004.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive for a specific mechanical defect on a small number of aircraft. It has not expanded beyond its original narrow purpose of ensuring cotter pin installation on wing struts."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined part numbers referenced (MS24665-360, MS24665-357, MS17826-14, MS17826-12)","Single applicability criterion (specific serial numbers)","Straightforward two-step requirement: inspect, then repair if needed","No cross-references to other legislation beyond a single note about the FAA equivalent","Clear compliance deadline with simple conditional ('unless already accomplished')"],"plain_english_summary":"This CASA safety order applies to 14 specific Cessna 208/208B aircraft and requires owners/operators to inspect the upper and lower wing‑strut nuts for correct cotter pins, tighten nuts as needed, and install any missing pins. Inspections are due within 10 flight hours after 12 May 2004 and any missing pins must be fitted before further flight. The measure prevents nuts loosening and possible wing‑support structural failure."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD is closely aligned with the stated original safety purpose: correcting a hardware/security issue (missing cotter pins) on specific serial-numbered aircraft. It does not broaden regulatory scope beyond that safety fix: applicability is narrowly limited by serial number, required action is a simple inspection/corrective installation, and it references an existing Cessna service project and FAA AD for technical detail. There is no evidence in this text that the AD expanded in scope beyond fixing the identified unsafe condition."},"complexity_factors":["Short document (single AD) with narrow applicability to specific serial numbers","Few defined parts (two nut P/Ns and two cotter pin P/Ns)","Simple, linear requirements: inspect, then if missing tighten/align/install","Clear, short compliance windows (10 hours TIS; before further flight)","Cross-references to Cessna SSP04-2, aircraft maintenance manual and FAA AD 2004-08-17 (minor added complexity)"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- Requires a one-time inspection and, if necessary, installation of specific cotter pins on the upper and lower wing strut attachment nuts of certain Cessna 208 and 208B aeroplanes (specific serial numbers listed in the AD).\n- If either required cotter pin is missing, the directive requires tightening the corresponding nut, aligning the nut castellations (the nut’s notched slots) with the hole for the cotter pin, and installing the specified cotter pin part number.\n- The work must follow Cessna Special Service Project SSP04-2 (dated 5 April 2004) and is also addressed in the applicable aircraft maintenance manual.\n\n**Who is affected**\n\n- Owners and operators of the listed Cessna 208/208B aircraft by serial number (see the AD for the exact serials).\n- Maintenance organisations and licensed engineers who perform the inspection and corrective action.\n- The CASA delegate (the regulator) enforces the requirement under the Civil Aviation Safety Regulations (CASR).\n\n**When it must be done**\n\n- Inspect within 10 hours time-in-service after 12 May 2004, unless already done.\n- If a missing cotter pin is found, the corrective action (tighten nut, align castellations, install cotter pin) must be completed before further flight.\n\n**Why (stated purpose)**\n\n- The AD states the action is necessary to correct an unsafe condition. The linked FAA AD and Cessna SSP04-2 provide the detailed technical rationale (missing or unsecured cotter pins on wing strut attachment nuts can allow nuts to back off, which could compromise the wing strut attachment).\n\n**Who pays and who decides**\n\n- Aircraft owners/operators pay for inspection time, labour, and any replacement cotter pins. If maintenance is outsourced, operators pay the maintenance provider.\n- CASA (via a delegate) requires compliance; licensed maintenance personnel decide the technical method within the instructions of SSP04-2 and the maintenance manual.\n\n**Costs, incentives and trade-offs**\n\n- Direct costs are small: short inspection time, inexpensive cotter pins, and minor labour to tighten and install pins. The main operational cost is potential aircraft downtime if the corrective action cannot be completed immediately.\n- Benefits (concentrated to affected aircraft and their crew/passengers) are an immediate reduction in the mechanical risk associated with wing strut attachment hardware.\n- Compliance incentives are strong: an AD is mandatory for continued airworthiness, so operators either do the work promptly or defer operations (ground the aircraft) until corrected.\n- Opportunity cost to the operator is mainly scheduling (lost flying time) and any repair shop booking time.\n\n**Implementation, compliance burden and risks**\n\n- Implementation is straightforward for licensed maintenance personnel following SSP04-2. The AD cross-references the Cessna procedure and the aircraft maintenance manual for technical detail.\n- Compliance burden is low and narrowly targeted (specific serial numbers and simple hardware). The principal implementation risk is incorrect installation (e.g., misalignment of castellations or incorrect cotter pin installation), which should be controlled by standard maintenance practices and the referenced service instruction.\n\n**Effects on private enterprise and competition**\n\n- Small maintenance shops and independent engineers can perform the work; the AD does not prescribe a particular supplier or exclusive service provider. The requirement imposes a small, short-term service demand on maintenance providers.\n\n**Other notes**\n\n- The AD explicitly references FAA AD 2004-08-17 and Cessna SSP04-2 for technical procedures. Operators should consult those documents and the aircraft maintenance manual for step-by-step instructions.\n\n(Required parts referenced in the AD: nut MS17826-14 with cotter pin MS24665-360 for upper attach fittings; nut MS17826-12 with cotter pin MS24665-357 for lower attach fittings.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-208-15-wing-struts-upper-attachment-bolts","history":"/api/acts/ad-cessna-208-15-wing-struts-upper-attachment-bolts/history","analysis":"/api/acts/ad-cessna-208-15-wing-struts-upper-attachment-bolts/analysis","conflicts":"/api/acts/ad-cessna-208-15-wing-struts-upper-attachment-bolts/conflicts","importantCases":"/api/acts/ad-cessna-208-15-wing-struts-upper-attachment-bolts/important-cases","documents":"/api/acts/ad-cessna-208-15-wing-struts-upper-attachment-bolts/documents"}}