{"id":"F2006B03772","name":"AD/BEECH 300/18 - Engine Controls Cross Shaft","slug":"ad-beech-300-18-engine-controls-cross-shaft","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43368,"registerId":"commonwealth-F2006B03772-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\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 300 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BEECH 300/18 Engine Controls Cross Sh","sectionType":"part","heading":"AD/BEECH 300/18 Engine Controls Cross Shaft 11/2004","content":"# AD/BEECH 300/18 Engine Controls Cross Shaft 11/2004\n\nApplicability: Raytheon (Formely Beech) model 300, 300LW, B300 and B300C aeroplanes having serial numbers as detailed in Raytheon Aircraft Company Mandatory Service Bulletin No. SB 73–3634, dated September 2003.\n\nRequirement: 1. Inspect the engine controls/cross shaft/pedestal for proper installation and carry out a torque check of the attach bolts, in accordance with Part I, Accomplishment Instructions of Raytheon Aircraft Company Mandatory Service Bulletin No. SB 73–3634.\n\n    2. If any improper installation or wrong torque is found during any inspection required by Requirement 1 of this Directive, correct the installation or torque in accordance with Part I, Accomplishment Instructions of Raytheon Aircraft Company Mandatory Service Bulletin No. SB 73–3634.\n\n    3. Unless previously accomplished modify the pedestal and replace the engine controls cross shaft hardware in accordance with Part II, Accomplishment Instructions of Raytheon Aircraft Company Mandatory Service Bulletin No. SB 73-3634.\n\nModification of the pedestal and replacement of the engine controls cross shaft hardware is the terminating action for the repetitive inspection and re-torque requirements specified in Requirement 1 of this Directive.\n\nNote 1: FAA AD 2004-17-02 Amdt 39-13774 refers.\n\nNote 2: The aeroplane maintenance manual also addresses the issues detailed in Requirements 1,2 and 3 of this Directive.\n\nCompliance: For Requirement 1: Initially inspect within the next 50 hours time-in-service (TIS) after the effective date of this Directive, unless already done within the last 50 hours TIS, and thereafter at intervals not to exceed 100 hours TIS until the modification in Requirement 3 of this Directive is done.\n\nFor Requirement 2: Before further flight.\n\nFor Requirement 3: At the next scheduled Maintenance/inspection interval or 12 calendar months after the effective date of this Directive, whichever occurs later.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No change to scope from the instrument's own terms: the AD applies only to the serial numbers listed in Raytheon SB 73‑3634 and mandates inspection/torque checks, immediate correction before flight, and a pedestal modification that terminates recurring inspections. It enforces the manufacturer instructions and cross‑references FAA and maintenance manual material without expanding applicability or adding unspecified obligations."},"complexity_factors":["Cross-reference to an external manufacturer Service Bulletin (Raytheon SB 73‑3634) for required procedures and affected serial numbers","Combination of recurring inspections (50/100 flight‑hour intervals) with a terminating modification action","Immediate corrective action required before further flight if defects found (operational safety constraint)","Two types of compliance metrics: flight hours and calendar months (scheduling complexity)","Mechanical tasks (torque checks, pedestal modification, hardware replacement) requiring qualified maintenance resources and parts","References to FAA AD and aeroplane maintenance manual as supplementary guidance (multi-source compliance)","Applicability limited to specific serial numbers rather than whole fleet (tracking and record-keeping burden)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Raytheon (formerly Beech) Model 300 series aircraft listed in Raytheon Service Bulletin SB 73‑3634 to inspect the engine controls cross‑shaft installation, perform a bolt torque check, correct any defects, and ultimately modify the pedestal and replace cross‑shaft hardware. The pedestal modification ends the need for repetitive inspections. Inspections must start within 50 flight hours, recur every 100 hours until modification, corrections must be made before further flight, and modification must occur by the next scheduled maintenance or within 12 months. Operators pay compliance costs; CASA enforces the AD."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, narrowly-targeted Airworthiness Directive addressing a specific identified safety defect in a particular aircraft model series. The scope remains tightly focused on the engine controls cross shaft issue as originally identified in the manufacturer's service bulletin. No scope creep is evident."},"complexity_factors":["Short, single-purpose document focused on one specific mechanical issue","Only 3 substantive requirements with clear sequential logic (inspect → fix if needed → permanent modification)","Minimal defined terms — relies on external reference to manufacturer's service bulletin (SB 73-3634) for technical details","Simple conditional structure: 'If improper installation found, then correct it'","Straightforward compliance timeline with three distinct deadlines for different requirements","No nested exceptions or complex cross-referencing to other legislation beyond a single note referencing the equivalent FAA directive"],"plain_english_summary":"CASA has issued a mandatory Airworthiness Directive for certain Beechcraft 300-series (300, 300LW, B300, B300C) requiring inspection and torque verification of the engine‑controls cross‑shaft assembly, immediate repair of any faults, and a permanent hardware modification to eliminate repeated checks.\n\nThis affects owners/operators of the listed aircraft because a failed or incorrectly installed cross‑shaft can cause loss of engine power control. Initial inspection is required within 50 flight hours, with repeat checks every 100 hours until the permanent modification is installed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-300-18-engine-controls-cross-shaft","history":"/api/acts/ad-beech-300-18-engine-controls-cross-shaft/history","analysis":"/api/acts/ad-beech-300-18-engine-controls-cross-shaft/analysis","conflicts":"/api/acts/ad-beech-300-18-engine-controls-cross-shaft/conflicts","importantCases":"/api/acts/ad-beech-300-18-engine-controls-cross-shaft/important-cases","documents":"/api/acts/ad-beech-300-18-engine-controls-cross-shaft/documents"}}