{"id":"F2006B04266","name":"AD/BEECH 90/82 - Ailerons","slug":"ad-beech-90-82-ailerons","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44069,"registerId":"commonwealth-F2006B04266-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 90/82 - Ailerons","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\nAD/BEECH 90/82 Ailerons 1/90\n\nApplicability: Model C90A with S/nos LJ-1132 through LJ-1167 and any aircraft which may have installed a replacement aileron for any reason subsequent to 1 January 1985.\n\n \n\nRequirement: Action in accordance with Beechcraft Mandatory SB No 2256.\n\n \n\nNote: FAA AD 89-22-14 refers.\n\n \n\nCompliance: Prior to exceeding 100 hours’ time in service after 25 January 1990, or at the next scheduled inspection for issue of a Maintenance Release after 25 January 1990, whichever occurs later.\n\n \n\nBackground: Country of origin AD. Foam may retain water and create an aileron out of balance condition. The out of balance limit could result in control surface flutter.\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 AD maintains its original narrow scope — addressing a specific manufacturing defect in specific Beechcraft aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined applicability criteria (specific serial number range + replacement history)","Single requirement referencing an external document (Beechcraft SB 2256)","Simple compliance deadline structure (hours-based OR inspection-based, whichever is later)","No nested exceptions, conditional logic, or cross-references to other legislation","Background explanation is straightforward and non-technical"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific aircraft owners/operators to take action to fix a known safety problem.\n\n**Who it affects:** Owners and operators of specific **Beechcraft King Air** aeroplanes — specifically Model C90A with serial numbers LJ-1132 through LJ-1167, plus any aircraft that had an aileron (the hinged flap on the wing that controls roll) replaced after 1 January 1985.\n\n**What the problem is:** The ailerons on these planes have foam inside them that can **absorb and retain water**. This makes the aileron **out of balance** (heavier on one side than designed). If the imbalance gets too bad, it can cause **flutter** — a dangerous vibration that can damage or destroy the control surface and potentially cause loss of control.\n\n**What must be done:** Operators must follow **Beechcraft Mandatory Service Bulletin No. 2256** — a set of instructions from the manufacturer on how to inspect and fix the problem.\n\n**When it must be done:** Before the aircraft flies more than 100 hours after 25 January 1990, or at the next scheduled inspection after that date — whichever comes later.\n\n**Why it matters:** This is a **flight safety issue**. Control surface flutter can escalate rapidly and cause catastrophic structural failure. The directive ensures affected aircraft are inspected and repaired before they become unsafe to fly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text sets a specific applicability (Model C90A serials LJ-1132 through LJ-1167 and any aircraft with a replacement aileron installed after 1 January 1985), prescribes compliance by following Beechcraft Mandatory SB No. 2256, and specifies the compliance timing. The directive itself does not indicate any change from that stated scope or expand beyond those terms; there is no express indication in the document that the intended population or obligations have been altered from the scope as written (Applicability, Requirement, Compliance)."},"complexity_factors":["Narrow applicability: specific serial numbers plus any aircraft with a replacement aileron after 1 Jan 1985 (Applicability).","Delegation of technical detail to an external document (Beechcraft Mandatory SB No. 2256) rather than containing remedial steps in the AD (Requirement).","Fixed, simple compliance trigger with two clear alternatives (100 hours after 25 Jan 1990, or next scheduled inspection issuing a Maintenance Release) (Compliance).","Reference to a foreign regulator’s AD (FAA AD 89-22-14) which may require cross-checking for technical detail (Note).","Potential ambiguity in determining whether a given aircraft ‘may have installed a replacement aileron’ after 1 Jan 1985 (Applicability)."],"plain_english_summary":"### What this directive does (mechanically)\n\nThis is an Airworthiness Directive (AD) for certain Beechcraft King Air aeroplanes. It requires operators to carry out the work set out in Beechcraft Mandatory Service Bulletin No. 2256. The AD does not reproduce the detailed tasks; it directs compliance with that manufacturer bulletin. (See: \"Requirement\".)\n\nThe directive must be complied with either before the affected aeroplane accumulates more than 100 hours’ time in service after 25 January 1990, or at the next scheduled inspection when a Maintenance Release is issued after 25 January 1990, whichever is later. (See: \"Compliance\".)\n\nA cross-reference to a US FAA AD is given (FAA AD 89-22-14). (See: \"Note\".)\n\n\n### Who this affects\n\n- Owners and operators of Beechcraft Model C90A aeroplanes with serial numbers LJ-1132 through LJ-1167. (See: \"Applicability\".)\n- Any aircraft that had a replacement aileron installed for any reason after 1 January 1985. This extends the AD beyond the listed serial-number range to machines that subsequently received replacement ailerons. (See: \"Applicability\".)\n- Maintenance organisations and technicians who must perform the work described in Beechcraft Mandatory SB No. 2256 and issue the Maintenance Release.\n\n\n### Why the requirement is in place (stated rationale) and how that interacts with costs and incentives\n\n- The AD states the safety concern: foam in the aileron may retain water and create an out-of-balance condition that could lead to control-surface flutter. (See: \"Background\".)\n- Mechanically, the AD forces owners/operators to inspect and carry out whatever corrective or modification work the manufacturer’s mandatory bulletin mandates. The AD does not itself specify parts, methods or costs; those are in SB No. 2256. (See: \"Requirement\".)\n\nWho pays and who decides\n\n- The aircraft owner/operator pays for the inspection and any corrective work specified by the service bulletin. The AD creates a legal duty to have the work done; compliance is certified by the Maintenance Release at the scheduled inspection or within 100 hours as specified. (See: \"Compliance\".)\n- The regulator (Civil Aviation Safety Authority via this AD) decides the regulatory trigger and timing; the manufacturer’s Mandatory Service Bulletin specifies the technical remedy. The operator and their approved maintenance organisation decide when, within the compliance window, to schedule and perform the work.\n\nCompliance burden, implementation risk and discretion\n\n- Compliance burden: operators must schedule and pay for the mandated work and any associated downtime. The AD links compliance to either a time-in-service threshold (100 hours after 25 January 1990) or the next scheduled inspection that issues a Maintenance Release, creating an operational scheduling choice. (See: \"Compliance\".)\n- Implementation risk: the AD delegates the technical solution to a manufacturer Mandatory Service Bulletin (SB No. 2256). That creates dependence on the SB’s clarity and completeness; the AD itself does not set technical tolerances or procedures. (See: \"Requirement\".)\n- Regulatory discretion: the AD prescribes the population and timing but not the exact fix; the manufacturer’s SB and the maintenance organisation determine the specific work performed.\n\nEffects on private choice, markets and business\n\n- Private choice: owners must choose when to schedule the mandated work within the compliance window, balancing aircraft availability and cost.\n- Maintenance market: the AD creates demand for the specific inspection/repair work described by the manufacturer’s SB. Maintenance organisations that perform this work obtain business from affected owners; owners cannot lawfully postpone the work beyond the AD’s compliance limits. (See: \"Requirement\" and \"Compliance\".)\n\nTrade-offs and opportunity costs\n\n- Operators face the direct cost of inspection and repair and the indirect cost of aircraft downtime. Those costs are concentrated on the owners/operators and on maintenance providers who must allocate capacity to perform the work.\n- The AD relies on the manufacturer’s SB and the FAA AD as technical sources; any ambiguity or incompleteness in those documents could increase implementation time and cost. (See: \"Note\" and \"Requirement\".)\n\nConcise operational guidance\n\n- If you own or operate an aeroplane within the stated applicability, arrange for the work in Beechcraft Mandatory SB No. 2256 to be carried out within the compliance window and obtain the Maintenance Release documenting compliance. (See: \"Applicability\", \"Requirement\", \"Compliance\".)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-90-82-ailerons","history":"/api/acts/ad-beech-90-82-ailerons/history","analysis":"/api/acts/ad-beech-90-82-ailerons/analysis","conflicts":"/api/acts/ad-beech-90-82-ailerons/conflicts","importantCases":"/api/acts/ad-beech-90-82-ailerons/important-cases","documents":"/api/acts/ad-beech-90-82-ailerons/documents"}}