{"id":"F2007L01234","name":"AD/750XL/12 - Wing Rear Spar","slug":"ad-750xl-12-wing-rear-spar","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65372,"registerId":"commonwealth-F2007L01234-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/12 | Wing Rear Spar | 7/2007 DM |\n| ----------- | -------------- | --------- |\n\n| Applicability: | Model PAC 750XL aircraft, serial numbers 101, 102, 104 through 128; except aircraft with modification PAC/XL/0273 incorporated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect the inboard end of the left and right rear spars for security of the blind rivets, which attach the fuselage attach fitting to the rear spar and inboard rib. Inspect the radii of the rear spar upper and lower flanges for cracking. Inspect from the attachment fitting to a point 8-inches (200 mm) outboard. Inspect the aft flange of the inboard rib for cracking.If the aft flange of the inboard rib is cracked or the rivets show signs of working, repair in accordance with modification PAC/XL/0270.If the rear spar is cracked, before further flight, replace the rear spar.Note 1: Modification PAC/XL/0270 is a repair scheme for damaged spars and inboard ribs, and may be used as an alternative means of compliance to the spar replacement of this Directive.2. On the left and right sides of the aircraft, remove the part number NAS1738E-6-6 blind rivets joining the rear spar part number 11-20031/32-1 and the aft end of the inboard rib, and replace with bolts or rivets as detailed in drawing No.11-20035 and PACSB/XL/022.Note 2: Modification PAC/XL/0217, which may already be installed on some aircraft, addresses the installation of a packer on the rear wing pick-up using bolts instead of rivets, and is an alternative means of compliance to the Requirement 2 modification.Note 3: NZ CAA AD DCA/750XL/9 refers. |\n| Compliance:    | 1. Within 50 hours time in service after 3 May 2007, unless already accomplished within the last 50 hours time in service. Inspect thereafter at intervals not to exceed 150 hours time in service until accomplishment of Requirement 2.2. Within 300 hours time in service or 12 months after 3 May 2007, whichever occurs first.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n\n|             | After accomplishment of Requirement 2, continue to inspect the left and right wing aft attachment area in accordance with the aircraft maintenance manual at intervals not to exceed 300 hours time in service or 12 months, whichever occurs first. |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|             | This Airworthiness Directive becomes effective on 3 May 2007.                                                                                                                                                                                        |\n| Background: | The NZ CAA requires certain actions in order to prevent damage to the rear spar due to working and failing rivets between the wing rear spar and inboard rib.                                                                                        |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n1 May 2007","sortOrder":0},{"sectionNumber":"AD/750XL/12","sectionType":"part","heading":"AD/750XL/12","content":"## AD/750XL/12","sortOrder":1},{"sectionNumber":"Wing Rear Spar","sectionType":"part","heading":"Wing Rear Spar","content":"## Wing Rear Spar","sortOrder":2},{"sectionNumber":"7/2007 DM","sectionType":"part","heading":"7/2007 DM","content":"## 7/2007 DM","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The Directive applies only to specified PAC 750XL serial numbers (except those with modification PAC/XL/0273) and prescribes inspections, repairs/replacements and hardware changes. The text contains alternative compliance paths (PAC/XL/0270, PAC/XL/0217) but gives no indication the instrument's scope was changed from its original stated aim of preventing rear-spar damage."},"complexity_factors":["Narrow applicability to listed serial numbers and exclusion if modification PAC/XL/0273 is installed (Applicability) — requires operators to check serial/mod status before action.","Multiple inspection tasks with specific locations and limits (inspect radii of upper/lower flanges, 8 inches/200 mm outboard, aft flange of inboard rib) (Requirement 1) — technical inspection skill and access required.","Tiered remedial options: repair per modification PAC/XL/0270 or full spar replacement before further flight if cracked (Requirement 1, Note 1) — creates a decision point with parts/engineering implications.","Mandated hardware change: remove specific blind rivet part NAS1738E-6-6 and replace per drawing No.11-20035 and PACSB/XL/022; alternative compliance via PAC/XL/0217 is accepted (Requirement 2, Note 2) — procurement and drawing-compliance burden.","Staged time-based compliance: initial inspection within 50 flight hours, repeat every ≤150 hours until hardware change; mandatory replacement within 300 hours or 12 months, then recurring inspections ≤300 hours/12 months (Compliance) — scheduling and tracking burden for operators.","Cross-references to other directives and foreign authority AD (NZ CAA AD DCA/750XL/9) (Requirement, Note 3, Background) — potential regulatory coordination/interpretation complexity.","Safety-critical operational constraint: cracked rear spar requires replacement before further flight (Requirement 1) — immediate operational/workforce/parts impact."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Pacific Aerospace PAC 750XL aircraft to inspect the inboard ends of the left and right wing rear spars and adjoining inboard ribs, repair or replace cracked components before further flight, and replace certain blind rivets with bolts or alternate rivets per the aircraft drawings/modifications. The stated purpose is to prevent rear-spar damage caused by working or failing rivets; it affects maintenance schedules, parts and labour choices, and requires compliance within set flight-hour or calendar limits."},"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 single-issue Airworthiness Directive addressing a specific structural defect in a particular aircraft model. The scope remains tightly focused on the wing rear spar rivet and cracking issue as originally intended. The alternative compliance methods (modifications PAC/XL/0270, PAC/XL/0217, and PAC/XL/0273 exception) are standard engineering alternatives typical of aviation safety directives, not scope creep."},"complexity_factors":["Single-purpose instrument with clear sequential requirements (Requirement 1 and Requirement 2)","Limited applicability scope (specific serial number range with one explicit exception)","Contains 3 defined modification references (PAC/XL/0273, PAC/XL/0270, PAC/XL/0217) and 2 drawing references","Simple conditional logic: 'If cracked, then repair/replace' with clear alternative compliance paths","Straightforward compliance timeline with two tiered deadlines (50 hours vs 300 hours/12 months)","Cross-reference to one foreign aviation directive (NZ CAA AD DCA/750XL/9) for background context","No nested exceptions or recursive definitions; exceptions are clearly stated in the applicability table"],"plain_english_summary":"This AD requires owners/operators of specified Pacific Aerospace 750XL aircraft (S/N 101, 102, 104–128; except those with mod PAC/XL/0273) to inspect and repair the wing rear spar attachment because blind rivets have been found working and can cause spar cracking and possible wing separation.  \n\nIt mandates an urgent inspection, recurring checks until a permanent fix, and replacement of the rivets with stronger fasteners within a short compliance window to restore structural integrity and prevent catastrophic failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-750xl-12-wing-rear-spar","history":"/api/acts/ad-750xl-12-wing-rear-spar/history","analysis":"/api/acts/ad-750xl-12-wing-rear-spar/analysis","conflicts":"/api/acts/ad-750xl-12-wing-rear-spar/conflicts","importantCases":"/api/acts/ad-750xl-12-wing-rear-spar/important-cases","documents":"/api/acts/ad-750xl-12-wing-rear-spar/documents"}}