{"id":"F2006B04038","name":"AD/BEECH 55/91 - Flap Flex Shaft Assembly","slug":"ad-beech-55-91-flap-flex-shaft-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43647,"registerId":"commonwealth-F2006B04038-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)![](image.001.png)AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)For 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 CAR 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\nBeechcraft 55, 58 and 95-55 (Baron) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BEECH 55/91 Flap Flex Shaft Assembly ","sectionType":"part","heading":"AD/BEECH 55/91 Flap Flex Shaft Assembly 3/2002","content":"# AD/BEECH 55/91 Flap Flex Shaft Assembly 3/2002\n\nDM\n\nApplicability: Beechcraft Model 58, 58A, 58P, 58PA, 58TC, 58TCA, 95-55, 95-A55, 95-B55, 95- B55A, 95-B55B (T-42A), 95-C55, 95-C55A, D55, D55A, E55 and E55A aircraft, all\n\nserial numbers\n\nRequirement: 1. Review the aircraft records to determine if either the LH or the RH flap flex shaft, or the flap actuator has been replaced since 1 March 2000. If these components have not been replaced since 1 March 2000, no further action is required. Make an appropriate certification in the aircraft log book.\n\n    2. If either a LH or RH flap flex shaft, or a flap actuator has been replaced since 1 March 2000, inspect the identification label for manufacture date of the flap flex shaft assemblies in accordance with Raytheon Service Bulletin 27-3478. Flex shafts manufactured before January 2000 and after April 2001 do not require replacement.\n\n    3. Replace flap flex shafts that were manufactured between January 2000 through April 2001.\n\nNote 1: FAA AD 2001-23-10 refers.\n\nNote 2: Beech 58 aircraft, S/Nos TH-1936 - TH-1988 and TH1990 – TH1996, may have had a discrepant flap flex shaft installed during production. These aircraft are identified in FAA AD 2001-23-10 as Group 1 aircraft. No Group 1 aircraft are currently on the Australian register. In the event such aircraft are imported into Australia, the requirements of this AD will be addressed during C of A issue\n\nCompliance: 1. Within 25 flight hours from the effective date of this Airworthiness Directive.\n\n    2. Within 25 flight hours from the effective date of this Airworthiness Directive.\n\n    3. Before further flight.\n\nThis Airworthiness Directive becomes effective on 30 January 2002.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD, as written, applies to the specified Beechcraft models and requires review, label inspection and conditional replacement of flap flex shafts manufactured in a defined date window. The text references an FAA AD and a manufacturer service bulletin but does not itself expand or narrow the listed applicability or introduce new categories beyond those specified."},"complexity_factors":["Precise applicability: long list of specific Beechcraft models and all serial numbers","Critical manufacture-date window (Jan 2000–Apr 2001) determines which parts require replacement","Two-stage compliance: records review then label inspection per Raytheon Service Bulletin 27-3478, then conditional replacement","Short compliance times: 25 flight hours for reviews/inspections; replacement required before further flight","Cross-references to external instruments: Raytheon Service Bulletin 27-3478 and FAA AD 2001-23-10","Note about a subset of aircraft (Group 1) that, if imported, will be addressed during Certificate of Airworthiness issue"],"plain_english_summary":"This Airworthiness Directive requires operators of the listed Beechcraft 55/58/95-55 series aeroplanes to check maintenance records for any replacement of left/right flap flex shafts or flap actuators since 1 March 2000, inspect flex-shaft manufacture dates per Raytheon Service Bulletin 27-3478, and replace shafts manufactured between January 2000 and April 2001. Compliance windows are short (25 flight hours for the checks; replacement before further flight), so owners/operators bear the cost and operational interruption; CASA (the delegate) 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 airworthiness directive with focused, targeted scope addressing a specific safety defect in identified aircraft models. The scope remains tightly constrained to the unsafe condition described."},"complexity_factors":["Multiple conditional branches (if/then logic) requiring record review before determining applicable action","Date-based manufacturing windows requiring careful interpretation (January 2000 through April 2001)","Cross-reference to external FAA directive (AD 2001-23-10) and manufacturer service bulletin (Raytheon SB 27-3478)","Specific serial number range carve-out for Group 1 aircraft with different compliance pathway","Dual compliance timelines (25 flight hours vs before further flight depending on finding)"],"plain_english_summary":"This CASA safety order targets specific Beechcraft Baron models and requires owners/operators to check for potentially defective flap flex shaft assemblies (manufactured Jan 2000–Apr 2001) that can fail in flight and cause loss of flap control.  \n\nCheck maintenance records for any flap flex shaft/actuator replacements since 1 Mar 2000 (most checks within 25 flight hours). If a shaft is dated Jan 2000–Apr 2001 it must be replaced before next flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-91-flap-flex-shaft-assembly","history":"/api/acts/ad-beech-55-91-flap-flex-shaft-assembly/history","analysis":"/api/acts/ad-beech-55-91-flap-flex-shaft-assembly/analysis","conflicts":"/api/acts/ad-beech-55-91-flap-flex-shaft-assembly/conflicts","importantCases":"/api/acts/ad-beech-55-91-flap-flex-shaft-assembly/important-cases","documents":"/api/acts/ad-beech-55-91-flap-flex-shaft-assembly/documents"}}