{"id":"F2006L02489","name":"AD/BEECH 90/86 Amdt 2 - Rudder Trim Tab","slug":"ad-beech-90-86-amdt-2-rudder-trim-tab","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":59683,"registerId":"commonwealth-F2006L02489-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Beechcraft 90 and 65-90 (King Air) Serie","sectionType":"division","heading":"Beechcraft 90 and 65-90 (King Air) Series Aeroplanes","content":"### Beechcraft 90 and 65-90 (King Air) Series Aeroplanes\n\n| AD/BEECH 90/86 Amdt 2 | Rudder Trim Tab | 9/2006 |\n| --------------------- | --------------- | ------ |\n\n| Applicability: | Group 1 aircraft:Models 65-90, 65-A90, B90, C90, and C90A aircraft, serial numbers LJ-1 through LJ-1280.Model E90 aircraft, serial numbers LW-1 through LW-347.Group 2 aircraft:Model C90A aircraft, serial numbers LJ-1281 through LJ-1732.                                                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | For Group 1 aircraft:1. Inspect the rudder trim tab for proper moisture drainage provisions in accordance with Beech Service Bulletin (SB) No. 2365 Revision 1.If the correct drainage provisions do not exist, before further flight, modify the rudder trim tab in accordance with SB No. 2365 Revision 1.For Group 2 aircraft:2. Inspect the rudder trim tab for proper moisture drainage provisions in accordance with SB No. 2365 Revision 2.If the correct drainage provisions do not exist, before further flight, modify the rudder trim tab in accordance with SB No. 2365 Revision 2.Note: FAA AD 2006-13-10 Amdt 39-14663 refers. |\n| Compliance:    | 1. Within 150 hours time in service after 25 June 1992, unless already accomplished.2. Within 150 hours time in service after 31 August 2006, unless already accomplished.The compliance time for Requirement 1 remains unchanged by this issue.                                                                                                                                                                                                                                                                                                                                                                                             |\n\n|             | This Amendment becomes effective on 31 August 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | The FAA received reports of trapped water in the rudder trim tabs on several of the affected aircraft. The cause was attributed to improper drainage provisions. The freeze-thaw action of trapped water may cause structural damage and could result in control surface flutter due to an out of balance condition.Amendment 1 extended applicability to additional serial numbered aircraft.Amendment 2 is issued in response to a new FAA AD, which extends applicability to additional Model C90A aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n19 July 2006","sortOrder":0},{"sectionNumber":"AD/BEECH 90/86 Amdt 2","sectionType":"part","heading":"AD/BEECH 90/86 Amdt 2","content":"## AD/BEECH 90/86 Amdt 2","sortOrder":1},{"sectionNumber":"Rudder Trim Tab","sectionType":"part","heading":"Rudder Trim Tab","content":"## Rudder Trim Tab","sortOrder":2},{"sectionNumber":"9/2006","sectionType":"part","heading":"9/2006","content":"## 9/2006","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 2 extends the applicability to additional Model C90A aircraft (serial numbers LJ-1281 through LJ-1732) and adds a corresponding inspection/modification requirement using SB No.2365 Revision 2 with its own 150‑hour compliance window (Applicability; Requirement; Compliance). The pre-existing Requirement 1 and its compliance time remain unchanged (Compliance)."},"complexity_factors":["Applicability split into two serial-numbered groups with different treatment (Applicability).","Different service bulletin revisions apply to each group (SB No.2365 Rev 1 vs Rev 2) (Requirement).","Two compliance time rules: an older 150‑hour deadline remaining unchanged and a new 150‑hour deadline tied to 31 August 2006 (Compliance).","'Before further flight' mandatory modification if drainage is inadequate creates immediate operational grounding risk (Requirement).","Cross-reference to FAA AD and prior amendment history increases traceability/verification steps (Background).","Enforcement relies on owners/operators to perform inspections and modifications per the specified SBs, creating variable cost and maintenance-burden depending on aircraft condition (Requirement/Compliance)."],"plain_english_summary":"Requires owners/operators of specified Beechcraft 90/65‑90 series aeroplanes (grouped by serial numbers) to inspect the rudder trim tab for moisture‑drainage and, if drainage provisions are missing, to modify the tab per Beech Service Bulletin No.2365 (different revisions for each group). The rule aims to prevent trapped water causing freeze–thaw structural damage and control‑surface flutter and creates inspection/modification costs and short, hours‑based compliance windows, including 'before further flight' where defects are found."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive (pre-1992) covered a narrower range of aircraft. Amendment 1 expanded coverage to additional serial numbers, and Amendment 2 further expanded applicability to newer Model C90A aircraft (serial numbers LJ-1281 through LJ-1732) in response to new FAA findings. The scope has grown from an initial safety issue affecting early production aircraft to a fleet-wide mandate covering decades of King Air production."},"complexity_factors":["Two distinct aircraft groups with different compliance documents (Revision 1 vs Revision 2 of Service Bulletin 2365)","Dual effective dates creating overlapping compliance timelines (1992 baseline and 2006 amendment)","Cross-reference to foreign regulatory instrument (FAA AD 2006-13-10)","Serial number ranges used to define applicability rather than simple model years","Conditional requirement: inspection mandatory, but modification only required if inspection reveals deficiency"],"plain_english_summary":"This AD requires owners/operators of certain Beechcraft King Air 65–90 series aeroplanes to inspect the rudder trim tab for adequate drainage and, if necessary, modify it before further flight. Water trapped in the tab can freeze, cause structural damage and unbalance the control surface, risking flutter and loss of control. The directive applies to two serial-number groups with specified compliance timeframes."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-90-86-amdt-2-rudder-trim-tab","history":"/api/acts/ad-beech-90-86-amdt-2-rudder-trim-tab/history","analysis":"/api/acts/ad-beech-90-86-amdt-2-rudder-trim-tab/analysis","conflicts":"/api/acts/ad-beech-90-86-amdt-2-rudder-trim-tab/conflicts","importantCases":"/api/acts/ad-beech-90-86-amdt-2-rudder-trim-tab/important-cases","documents":"/api/acts/ad-beech-90-86-amdt-2-rudder-trim-tab/documents"}}