{"id":"F2006B03928","name":"AD/BEECH 400/25 - Roll Trim Printed Circuit Board Assembly","slug":"ad-beech-400-25-roll-trim-printed-circuit-board-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43537,"registerId":"commonwealth-F2006B03928-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\nBeechcraft 400 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BEECH 400/25 Roll Trim Printed Circui","sectionType":"part","heading":"AD/BEECH 400/25 Roll Trim Printed Circuit Board Assembly","content":"# AD/BEECH 400/25 Roll Trim Printed Circuit Board Assembly\n\n  \n5/2004","sortOrder":1},{"sectionNumber":"Model","sectionType":"part","heading":"Model","content":"## Model\n\n400A\n\n400T","sortOrder":2},{"sectionNumber":"Serial Number Range","sectionType":"part","heading":"Serial Number Range","content":"##   \nSerial Number Range\n\nRK-45 and RK-49 through RK-322 inclusive\n\nTT-1 through TT-180 inclusive and TX-1 through TX-12 inclusive","sortOrder":3},{"sectionNumber":"Beechcraft 400 Series Aeroplanes","sectionType":"part","heading":"Beechcraft 400 Series Aeroplanes","content":"## Beechcraft 400 Series Aeroplanes\n\nAD/BEECH 400/25 (continued)\n\nBackground: This Directive requires an inspection to determine the part number of the A194 roll trim PCB and, if necessary, replacement of certain PCBs with improved parts. This action is necessary to prevent intermittent sticking of the relays on the PCB in either the open or closed position, which could result in an out-of-trim condition that may require the use of considerable control wheel force to keep the wings level and consequent reduced controllability of the aeroplane.\n\n![Signature: James Coyne](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 1 April 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 21 April 2004.","sortOrder":4}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD enforces inspection and conditional replacement for a defined component on a defined subset of the Beechcraft 400 series, matching the stated safety objective in the background. It does not expand applicability beyond the listed serial-number ranges or add unrelated requirements."},"complexity_factors":["Technical component-level action: inspection of a specific PCB (A194) and conditional replacement to address relay sticking.","Applicability limited to enumerated serial-number ranges, requiring accurate fleet identification.","Compliance mechanics referenced to the AD's 'requirement' and 'compliance' sections, creating procedural obligations and timing constraints.","Identification of the affected part may require access or disassembly, adding operational burden.","Costs and operational disruption fall on aircraft operators (inspection and replacement).","Regulatory enforcement and timing are directed by the CASA delegate, giving centralised decision authority."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Beechcraft 400A and 400T aeroplanes to inspect the A194 roll-trim printed circuit board (PCB) to confirm its part number and, if necessary, replace certain PCBs with improved parts. The directive applies to aircraft within the listed serial-number ranges.\n\nCASA's delegate sets the inspection and replacement timing and procedures; operators pay for inspections and any replacements and must follow the AD's requirement and compliance instructions. The stated aim is to prevent relay sticking that could produce an out-of-trim condition and reduced controllability."},"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 safety defect in a specific aircraft component (roll trim PCB) for specific aircraft models. There is no evidence of scope creep; the directive remains tightly focused on the original safety issue identified."},"complexity_factors":["Very short document (approximately 300 words)","Only 1 defined term implicitly referenced (PCB - explained in context)","Single straightforward requirement: inspect, and if necessary, replace","No cross-references to other legislation beyond the enabling regulation (CASR 1998 subregulation 39.1(1))","Clear applicability section with specific aircraft models and serial numbers","Simple causal chain in background: faulty part → relay sticking → out-of-trim → reduced controllability"],"plain_english_summary":"This CASA safety order requires owners/operators of specified Beechcraft 400A/400T aircraft to inspect the roll-trim PCB and replace any units with part number A194 with an improved PCB. It addresses relay-sticking that can create an out-of-trim roll condition, forcing pilots to apply heavy control-wheel forces and increasing loss-of-control risk. Affected aircraft are those listed by serial number in the order; exact compliance timing is set in the order."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-400-25-roll-trim-printed-circuit-board-assembly","history":"/api/acts/ad-beech-400-25-roll-trim-printed-circuit-board-assembly/history","analysis":"/api/acts/ad-beech-400-25-roll-trim-printed-circuit-board-assembly/analysis","conflicts":"/api/acts/ad-beech-400-25-roll-trim-printed-circuit-board-assembly/conflicts","importantCases":"/api/acts/ad-beech-400-25-roll-trim-printed-circuit-board-assembly/important-cases","documents":"/api/acts/ad-beech-400-25-roll-trim-printed-circuit-board-assembly/documents"}}