{"id":"F2006B03660","name":"AD/BEECH 1900/41 - Elevator Trim System","slug":"ad-beech-1900-41-elevator-trim-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43250,"registerId":"commonwealth-F2006B03660-current","compilationNumber":null,"startDate":"2026-04-01","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 1900 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BEECH 1900/41 Elevator Trim System 13","sectionType":"part","heading":"AD/BEECH 1900/41 Elevator Trim System 13/2003","content":"# AD/BEECH 1900/41 Elevator Trim System 13/2003\n\nDM\n\nApplicability: All Models 1900, 1900C, and 1900D aircraft.\n\nRequirement: 1. Mark with a pen, the applicable figure in the maintenance manual as referenced below. The depiction in the referenced figures is incorrect for the elevator trim drum only, and depicts the cable drum at 180 degrees from the installed position and shows the open, keyed side of the drum instead of the flat side of the drum. Insert corrected figure (Figure 1 of this Directive) into the applicable maintenance manual, and identify it accordingly, as specified in Raytheon Safety Communique No. 234, dated September 2003:\n\n    Figure 9 of Chapter 27-10-00 of the Model 1900/1900C Airliner Maintenance Manual (114-590021-7B). Clearly note in pen that existing portion of Figure 9 is correct for the aileron trim drum only and insert corrected figure (Figure 1 of this Directive) marked in pen as correct for the elevator trim drum only; or,\n\n    b. Mark out Figure 201 of Chapter 27-30-04 of the Model 1900D Airliner Maintenance Manual 125-590000-15). Insert corrected figure (Figure 1 of this Directive).\n\n    2. Incorporate the applicable temporary revision into the maintenance manuals as specified in Safety Communique No. 234, as follows:\n\n    Temporary Revision No. 27-5 to the Model 1900/1900C Airliner Maintenance Manual: Revised ELEVATOR TRIM OPERATIONAL CHECK; or,\n\n    b. Temporary Revision No. 27-9 to the Model 1900D Airliner Maintenance Manual: Added MANUAL ELEVATOR TRIM OPERATIONAL CHECK.\n\n    3. Accomplish the elevator trim operational check that is specified in the applicable maintenance manual and temporary revisions to the maintenance manual, as referenced in Requirement 2 and specified in Safety Communique No. 234.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: correcting a specific technical documentation error for a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Short, single-purpose directive with only 3 requirements","Minimal defined terms (relies on external maintenance manual references)","Clear applicability section (specific aircraft models only)","Some cross-referencing to external documents (Raytheon Safety Communique No. 234 and specific manual chapters)","Conditional logic limited to 'applicable' manual versions (1900/1900C vs 1900D variants)","No nested exceptions or complex temporal conditions"],"plain_english_summary":"This AD requires owners/operators of Beechcraft 1900, 1900C and 1900D aircraft to correct an erroneous elevator trim drum diagram and related procedures in their maintenance manuals and to verify proper elevator trim operation. \n\nIt matters because the incorrect diagram could lead to wrong maintenance actions on a primary pitch-control component, increasing the risk of loss of control in flight."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No change of scope is evident in the instrument text. The AD applies to all listed Model 1900/1900C/1900D aircraft and prescribes corrective marking/figure insertion, incorporation of temporary manual revisions, and an operational check (Applicability; Requirements 1–3)."},"complexity_factors":["Applicability to three model variants requires checking multiple manual editions (Applicability).","Manual amendment options: marking an existing figure or inserting a corrected figure, which raises risk of inconsistent implementation (Requirement 1).","Mandated incorporation of temporary revisions from an external Raytheon Safety Communique (No. 234) imposes a documentary compliance step (Requirement 2).","Requires an operational functional check of the elevator trim—a shop/crew task that consumes labour and aircraft time (Requirement 3).","Low technical difficulty but non‑zero scheduling and recordkeeping burden for operators and maintenance organisations.","Limited regulatory discretion in text—the CASA delegate prescribes the actions, but execution details rely on operators following the referenced communique and manual revisions."],"plain_english_summary":"This Airworthiness Directive requires operators of Beechcraft 1900, 1900C and 1900D aeroplanes to correct a mis‑depicted elevator trim drum in their maintenance manuals, insert the corrected figure, incorporate temporary revisions from Raytheon Safety Communique No. 234, and perform an elevator‑trim operational check (Requirements 1–3). The CASA delegate issued the mandatory directive under CASR subreg 39.1(1) to address an unsafe condition. Operators bear the labour and downtime costs; the actions change maintenance documentation and routine checks."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-1900-41-elevator-trim-system","history":"/api/acts/ad-beech-1900-41-elevator-trim-system/history","analysis":"/api/acts/ad-beech-1900-41-elevator-trim-system/analysis","conflicts":"/api/acts/ad-beech-1900-41-elevator-trim-system/conflicts","importantCases":"/api/acts/ad-beech-1900-41-elevator-trim-system/important-cases","documents":"/api/acts/ad-beech-1900-41-elevator-trim-system/documents"}}