{"id":"F2007L01350","name":"AD/750XL/11 - Rudder Trim Tab Pivot","slug":"ad-750xl-11-rudder-trim-tab-pivot","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65595,"registerId":"commonwealth-F2007L01350-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pacific Aerospace 750XL Series Aeroplane","sectionType":"division","heading":"Pacific Aerospace 750XL Series Aeroplanes","content":"### Pacific Aerospace 750XL Series Aeroplanes\n\n| AD/750XL/11 | Rudder Trim Tab Pivot | 6/2007 |\n| ----------- | --------------------- | ------ |\n\n| Applicability: | Model 750XL aircraft without modification PAC/XL/0267 incorporated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect the rudder trim tab upper pivot in accordance with the instructions in Pacific Aerospace Limited Mandatory Service Bulletin (MSB) PACSB/XL/023.If there is any lateral movement of the bush, incorporate modification PAC/XL/0267 in accordance with MSB PACSB/XL/023 and PAC Drawing No. 11-03131.Note 1: Modification PAC/XL/0267 comprises removing the upper bush part number 11-33119-1 and installing upper bearing part number 11-33121-1 in accordance with PAC Drawing No. 11-03131. This modification constitutes terminating action to the requirements of this Directive.2. Modify the rudder trim tab upper pivot in accordance with MSB PACSB/XL/023 and PAC Drawing No. 11-03131.Note 2: NZ CAA AD DCA/750XL/11 refers. |\n| Compliance:    | 1. Within 150 hours time in service after 7 June 2007. Thereafter at intervals not to exceed 150 hours time in service; until Requirement 2 is accomplished.2. Within 450 hours time in service or 24 months after 7 June 2007, whichever occurs first.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n|                | This Airworthiness Directive becomes effective on 7 June 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| Background:    | Wear has been detected in the rudder trim tab upper pivot hole in the rudder rib. This Directive requires inspections until eventual replacement of the trim tab upper pivot bush with a bearing.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n24 April 2007","sortOrder":0},{"sectionNumber":"AD/750XL/11","sectionType":"part","heading":"AD/750XL/11","content":"## AD/750XL/11","sortOrder":1},{"sectionNumber":"Rudder Trim Tab Pivot","sectionType":"part","heading":"Rudder Trim Tab Pivot","content":"## Rudder Trim Tab Pivot","sortOrder":2},{"sectionNumber":"6/2007","sectionType":"part","heading":"6/2007","content":"## 6/2007","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":3,"scope_assessment":{"changed":false,"description":"The directive stays within its original, targeted remit: addressing wear in the rudder trim tab upper pivot on Model 750XLs that have not yet received modification PAC/XL/0267. It prescribes inspections until operators install the specified bearing replacement, and does not broaden or narrow the applicability beyond that set of aircraft."},"complexity_factors":["Narrow applicability: applies only to Model 750XL aircraft without modification PAC/XL/0267 (straightforward scope).","Clear technical action: inspect pivot bush for lateral movement and replace with specified bearing per MSB PACSB/XL/023 and PAC Drawing No. 11-03131 (mechanical, prescriptive remedy).","Defined compliance intervals: 150‑hour repeating inspections until modification; modification required within 450 hours or 24 months (operational scheduling impact).","Terminating action: installing PAC/XL/0267 (upper bearing 11-33121-1) ends inspection requirement (simple compliance endpoint).","Operational burdens: recurring inspections, parts procurement and aircraft downtime fall to operators/owners (implementation cost and scheduling).","Cross-reference to other directives/MSBs (NZ CAA AD DCA/750XL/11 and PAC SB) requires consultation of external documents for full instructions."],"plain_english_summary":"This Airworthiness Directive requires operators of Pacific Aerospace 750XL aeroplanes (those without modification PAC/XL/0267) to inspect the rudder trim tab upper pivot for lateral movement and, if needed, replace the upper bush with a bearing per Pacific Aerospace Mandatory Service Bulletin PACSB/XL/023 and PAC Drawing 11-03131. Inspections must occur every 150 flight hours until the modification is fitted, which must be completed within 450 hours or 24 months; owners/operators bear the inspection, parts and downtime costs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific wear issue in the rudder trim tab pivot of one aircraft model. It has not expanded beyond its initial safety purpose."},"complexity_factors":["Single, specific mechanical issue (one aircraft model, one part)","Only 2 defined compliance paths (inspection interval vs replacement deadline)","No nested exceptions or conditional logic — straightforward 'inspect until you replace'","Minimal cross-referencing (only to specific manufacturer service bulletins and drawings)","Short document (~250 words of substantive content)","Clear, sequential numbering (Requirements 1 and 2, Compliance 1 and 2)"],"plain_english_summary":"This AD requires owners of Pacific Aerospace 750XL aircraft (without modification PAC/XL/0267) to inspect the rudder trim tab upper pivot for lateral movement every 150 flight hours and replace the worn bush with an improved bearing within 450 flight hours or 24 months. \n\nIt targets a wear-related loss of rudder control risk; installing the new bearing is the terminating action that eliminates ongoing inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-750xl-11-rudder-trim-tab-pivot","history":"/api/acts/ad-750xl-11-rudder-trim-tab-pivot/history","analysis":"/api/acts/ad-750xl-11-rudder-trim-tab-pivot/analysis","conflicts":"/api/acts/ad-750xl-11-rudder-trim-tab-pivot/conflicts","importantCases":"/api/acts/ad-750xl-11-rudder-trim-tab-pivot/important-cases","documents":"/api/acts/ad-750xl-11-rudder-trim-tab-pivot/documents"}}