{"id":"F2006B04202","name":"AD/BEECH 90/100 - Nacelle and Spar Assembly Rivets","slug":"ad-beech-90-100-nacelle-and-spar-assembly-rivets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43958,"registerId":"commonwealth-F2006B04202-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.002.png)![](image.001.png)AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)For 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 CAR 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\nBeechcraft 90 and 65-90 (King Air) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BEECH 90/100 Nacelle and Spar Assembl","sectionType":"part","heading":"AD/BEECH 90/100 Nacelle and Spar Assembly Rivets 9/2002","content":"# AD/BEECH 90/100 Nacelle and Spar Assembly Rivets 9/2002\n\nDM\n\nApplicability: Model C90A aircraft, serial numbers LJ-1157 through LJ-1276, LJ-1278 through LJ- 1537, and LJ-1540.\n\nRequirement: 1. Insert Raytheon Temporary Changes TC3 (Log of Temporary Changes) into the Limitations Section of the Pilot’s Operating Handbook (POH).\n\n    2. Accomplish the following in accordance with the Accomplishment Instructions section of Raytheon Mandatory Service Bulletin SB 54-3308, Issued October 2000, and the applicable maintenance manual:\n\n    Inspect the left hand and right hand nacelle and spar assembly for the existence of rivets, and installed rivets that are the wrong size and/or type.\n    Before further flight, install rivets where rivets are missing, and replace rivets that are the wrong size and/or type with the correct rivet.\n\nNote 1: The Temporary Changes TC3 may be removed from the POH following compliance with Requirement 2.\n\nNote 2: FAA AD 2002-09-12 Amdt 39-12745 refers.\n\nCompliance: 1. Within 10 hours’ time in service after 24 July 2002, unless already\n\naccomp lished; until compliance with Requirement 2.\n\n2. Within 400 hours’ time in service or within 12 calendar months after 24 July 2002, whichever occurs first; unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 24 July 2002.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD is narrowly focused on a specific unsafe condition (nacelle and spar assembly rivet presence/type) for a defined set of C90A serial numbers. It requires a temporary POH change and a targeted inspection/repair action following a Raytheon service bulletin. That scope is consistent with the stated purpose (correcting the unsafe condition) and does not broaden the AD beyond that original intent. The AD does not add unrelated obligations or expand to other models/serial ranges beyond those listed."},"complexity_factors":["Short document (single AD, limited sections)","Clear applicability by specific serial-number ranges","Two discrete requirements (insert POH temporary change; inspect and repair rivets)","Cross-reference to one external technical document: Raytheon Mandatory Service Bulletin SB 54-3308","Cross-reference to applicable maintenance manual","Compliance timing has a small number of conditions (10 hours for POH change; 400 hours or 12 months for inspection/repair; \"before further flight\" for discovered defects)","Two short notes (ability to remove TC3 after compliance; reference to FAA AD)"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- Applies to certain Beechcraft C90A aircraft by serial number (Applicability).\n- Requires the operator to insert Raytheon’s Temporary Changes (TC3) into the Pilot’s Operating Handbook (POH) (Requirement 1).  The TC3 may be removed after the physical inspection/repairs required by Requirement 2 (Note 1).\n- Requires an inspection of the left and right nacelle and spar assemblies to find any missing rivets or rivets that are the wrong size/type, and requires that any missing rivets be installed and any incorrect rivets be replaced with the correct rivet type/size.  The inspection and any work must follow Raytheon Mandatory Service Bulletin SB 54-3308 and the applicable maintenance manual (Requirement 2).\n- Sets the compliance timing: insert the POH temporary change within 10 hours’ time in service after 24 July 2002 (and keep it there until the inspection/repair is done); complete the inspection/repairs within 400 hours’ time in service or 12 calendar months after 24 July 2002, whichever comes first (Compliance).\n- Notes that this AD refers to FAA AD 2002-09-12 and that the details of the inspection/repair are in Raytheon’s service bulletin (Note 2 and Requirement 2).\n\n**Who this affects**\n\n- Owners and operators of Beechcraft Model C90A aircraft with the listed serial numbers (those specific serial-numbered aircraft only). \n- Maintenance organisations and licensed mechanics who perform aircraft inspections and rivet replacement work must follow the Raytheon service bulletin and the aircraft maintenance manual.\n\n**Why it matters (official purpose and practical implications)**\n\n- Officially: the CASA delegate issued the AD to correct an \"unsafe condition\" involving nacelle and spar assembly rivets (opening text). The AD’s mechanical effect is to ensure required rivets are present and of the correct size/type.\n\n- Practical effects and trade-offs:\n  - Safety-focused action: the inspection and corrective work are intended to remove structural or attachment risks caused by missing or incorrect rivets. The AD forces operators to check and, where necessary, repair the nacelle/spar rivet condition.\n  - Who pays: owners/operators pay for the inspection labour and for any rivets and replacement labour. If maintenance is done by a third party, operators also pay for that contracted service. Costs vary with how many rivets need replacement and any access/repair complexity.\n  - Operational impact: operators must insert a temporary POH change quickly (within 10 flight hours) and may need to schedule aircraft downtime to perform inspections and repairs before the 400-hour / 12-month deadline. If missing/wrong rivets are found, repairs must be completed before further flight for those defects (Requirement 2 — \"Before further flight, install rivets where rivets are missing, and replace rivets that are the wrong size and/or type...\").\n  - Implementation dependencies: compliance requires using Raytheon Mandatory Service Bulletin SB 54-3308 and the applicable maintenance manual; differences between operator practice and the service bulletin could create interpretation or labour-time variation. The AD defers to the service bulletin for technical steps, so enforcement and adequate completion depend on following that document.\n  - Record-keeping and procedural change: operators must update the POH (temporary change) and then remove that entry after completing the required maintenance per Note 1. Maintenance records should reflect inspection findings and corrective actions to show compliance.\n\n**Who decides and what changes in behaviour**\n\n- CASA (through the delegate who issued the AD) mandates the action and the deadlines. Licensed maintenance personnel decide the exact execution, using Raytheon’s service bulletin and the maintenance manual. Operators decide scheduling and bear the cost of compliance.\n- Behaviour changes required: insert and later remove a POH temporary change; perform targeted inspections of the nacelle and spar assemblies; replace or install rivets if missing or incorrect; comply with timing limits (10 flight hours for POH change, 400 flight hours/12 months for full inspection/repair). The AD also requires immediate repair before further flight if missing/wrong rivets are discovered.\n\n**Concrete risks, costs and trade-offs to note**\n\n- Concentrated costs fall on operators of the listed serial-number aircraft (they pay labour and parts). The safety benefit is diffuse (applies to aircraft structural integrity).\n- Implementation risk arises from reliance on the Raytheon service bulletin — if that bulletin is ambiguous or needs interpretation, maintenance shops must make judgement calls consistent with the maintenance manual and regulators.\n- Opportunity cost: scheduled maintenance and possible out-of-service time for affected aircraft, and the use of mechanic hours and hangar facilities that could be used elsewhere.\n\n(Referenced sections: Applicability; Requirement 1 and Requirement 2; Notes 1–2; Compliance.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific manufacturing defect in specific serial numbers of one aircraft model. There is no evidence of scope creep; the directive remains tightly focused on the identified unsafe rivet condition in the nacelle and spar assembly."},"complexity_factors":["Very short document (approximately 250 words)","Only 3 defined applicability criteria (specific aircraft model and serial number ranges)","Simple two-step requirement structure with clear cross-reference to manufacturer service bulletin","Straightforward compliance timeline with only two alternative deadlines ('whichever occurs first')","No nested exceptions or conditional logic beyond basic 'unless already accomplished' clauses","Single cross-reference to FAA AD for administrative tracking purposes only"],"plain_english_summary":"This safety order requires owners/operators of specified Beechcraft C90A King Airs (certain LJ serials) to immediately insert a temporary flight‑manual notice and, within 400 flight hours or 12 months, inspect and correct missing, wrong‑sized, or wrong‑type rivets in the engine nacelles and wing spars. It matters because defective rivets in those structural areas could cause failure, loss of control, or an accident; repairs must be completed before further flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-90-100-nacelle-and-spar-assembly-rivets","history":"/api/acts/ad-beech-90-100-nacelle-and-spar-assembly-rivets/history","analysis":"/api/acts/ad-beech-90-100-nacelle-and-spar-assembly-rivets/analysis","conflicts":"/api/acts/ad-beech-90-100-nacelle-and-spar-assembly-rivets/conflicts","importantCases":"/api/acts/ad-beech-90-100-nacelle-and-spar-assembly-rivets/important-cases","documents":"/api/acts/ad-beech-90-100-nacelle-and-spar-assembly-rivets/documents"}}