{"id":"F2006B04209","name":"AD/BEECH 90/16 - Rudder Spar and Hinges - Inspection and Modification","slug":"ad-beech-90-16-rudder-spar-and-hinges-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43965,"registerId":"commonwealth-F2006B04209-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 90/16 - Rudder Spar and Hinges - Inspection and Modification","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)  Beechcraft 90 and 65-90 (King Air) Series Aeroplanes\n\n \n\n# AD/BEECH 90/16 Rudder Spar and Hinges - Inspection\n\nand Modification Applicability: Models 65-90, 65-A90 and B90 with S/Nos. LJ-1 to LJ-428. Document:               Beechcraft SI No. 0101-135.\n\n# 5/69\n\nCompliance: 1. Inspection within 100 hours’ time in service after 12 May 1969 and thereafter at intervals not exceeding 100 hours’ time in service until modified.\n\n \n\n2. Modify before 1 August 1969.\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":"The text provided is a standalone airworthiness directive applying to the specified models and serial numbers and prescribing inspection intervals and a modification deadline. The instrument itself contains no indication that its scope has been amended from an earlier or original version; there is no amendment history included in the supplied text to show a change of scope."},"complexity_factors":["Narrow applicability: specific aircraft models and serial-number range (LJ-1 to LJ-428) reduces operational spread.","Clear, short deadlines: first inspection timing (100 hours after 12 May 1969) and firm modification deadline (before 1 August 1969) simplify scheduling but concentrate workload.","Recurring action until a single event: inspections every 100 hours until the one-off modification is completed.","Dependence on an external technical document (Beechcraft SI No. 0101-135) for procedural details increases practical complexity because the directive does not itself set out technical steps.","Limited text and few provisions (only two compliance paragraphs) keep legal structure simple.","Potential for operational ambiguity about what constitutes satisfactory completion of the modification without consulting the referenced service instruction."],"plain_english_summary":"What this instrument does (mechanically)\n\n- Requires owners/operators of specified Beechcraft 65-90/90-series aeroplanes (serial numbers LJ-1 to LJ-428) to carry out recurring inspections of the rudder spar and hinges and to complete a specified modification. (Applicability: Models 65-90, 65-A90 and B90 with S/Nos. LJ-1 to LJ-428; Document: Beechcraft SI No. 0101-135.)\n\n- Inspection timing: carry out an inspection within 100 hours’ time in service after 12 May 1969 and then repeat inspections at intervals not exceeding 100 hours’ time in service until the modification is done. (Compliance paragraph 1.)\n\n- Modification timing: complete the required modification before 1 August 1969. (Compliance paragraph 2.)\n\nWho decides and who pays\n\n- The directive is issued under the Commonwealth civil aviation regulatory framework (PART 39 - Schedule of Airworthiness Directives); the Civil Aviation Safety Authority is the regulatory authority named in the header. The specific technical steps to inspect and modify are referenced to Beechcraft Service Instruction No. 0101-135, which operators must follow. (Header and Document reference.)\n\n- The direct financial and operational costs fall to the aircraft owners/operators: they must allocate labour time for inspections at the stated intervals and procure and install whatever parts or services the referenced service instruction requires to complete the modification.\n\nWhy the directive exists (as stated) and how that maps to costs and incentives\n\n- The title and references identify the affected components as the rudder spar and hinges; the directive therefore imposes inspection and a required modification for those components. The instrument itself does not state an explicit narrative justification beyond the title and the technical reference. (Title and Document reference.)\n\n- The compliance design creates two concrete incentives for owners/operators: (a) perform repeated inspections at 100-hour intervals until the modification is done; (b) complete the modification before the deadline to stop the recurring-inspection obligation. These incentives shift costs from ongoing inspection labour to a one-off modification cost if taken before the deadline.\n\nPractical implementation points, trade-offs and risks\n\n- Operators must consult Beechcraft SI No. 0101-135 for the technical inspection and modification procedures; the text of this directive does not itself set out the technical method. (Document reference.)\n\n- The directive sets short compliance timelines: the first inspection is within 100 hours after 12 May 1969 and the modification must be completed before 1 August 1969. This produces a concentrated near-term workload for affected operators and a continuing inspection burden for any aircraft not yet modified. (Compliance paragraphs 1–2.)\n\n- The instrument creates administrative obligations (recording inspections and completing the referenced modification) but does not in this text describe enforcement measures or penalties; those remain governed by the broader civil aviation regulations cited in the header. (Header reference.)\n\n- Ambiguities that require operational interpretation: what exactly satisfies the modifier’s completion requirement must be established by following the referenced Beechcraft service instruction; the directive’s phrase \"until modified\" means inspections must continue until an operator can demonstrate the modification has been completed according to the referenced instruction. (Compliance paragraph 1 and Document reference.)\n\nNet behaviour change required\n\n- Owners/operators must add repeated 100‑hour inspections of rudder spar and hinges and must arrange and pay for the referenced modification before the prescribed deadline. Once the modification is completed per the service instruction, the recurring 100‑hour inspection requirement ceases under this directive."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a historical Airworthiness Directive from 1969 with a narrow, specific scope addressing a known safety issue in particular aircraft. It has not expanded beyond its original purpose of mandating inspection and modification of rudder components."},"complexity_factors":["Very short document (approximately 150 words)","Only 3 defined applicability criteria (specific aircraft models and serial number range)","Single external reference to manufacturer service information","Two straightforward compliance requirements with clear deadlines","No nested conditions, exceptions, or cross-references to other legislation","No interpretation section or defined terms"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Beechcraft King Air aeroplanes** (models 65-90, 65-A90 and B90 with serial numbers LJ-1 through LJ-428) to:\n- **Inspect the rudder spar and hinges** every 100 hours of flight time, starting from 12 May 1969, until a modification is completed\n- **Carry out a specific modification** to the rudder before 1 August 1969\n\n**Who it affects:**\nOwners and operators of early-model Beechcraft King Air aircraft in Australia — specifically those built with serial numbers LJ-1 to LJ-428.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. If you don't comply, you cannot legally fly the aircraft. This particular AD addresses potential structural defects in the rudder (the vertical control surface at the tail) that could affect flight safety. The directive references a **Service Information (SI) document** from Beechcraft (SI No. 0101-135) which contains the technical details of what needs to be done.\n\n**Key dates:**\n- Inspections start: within 100 flight hours after 12 May 1969\n- Modification deadline: before 1 August 1969"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-90-16-rudder-spar-and-hinges-inspection-and-modification","history":"/api/acts/ad-beech-90-16-rudder-spar-and-hinges-inspection-and-modification/history","analysis":"/api/acts/ad-beech-90-16-rudder-spar-and-hinges-inspection-and-modification/analysis","conflicts":"/api/acts/ad-beech-90-16-rudder-spar-and-hinges-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-beech-90-16-rudder-spar-and-hinges-inspection-and-modification/important-cases","documents":"/api/acts/ad-beech-90-16-rudder-spar-and-hinges-inspection-and-modification/documents"}}