{"id":"F2006B08450","name":"AD/CESSNA 750/1 - Bulkhead Web Doubler","slug":"ad-cessna-750-1-bulkhead-web-doubler","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115953,"registerId":"commonwealth-F2006B08450-current","compilationNumber":null,"startDate":"2026-04-03","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\nCessna 750 (Citation X) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/CESSNA 750/1 Bulkhead Web Doubler 9/2","sectionType":"part","heading":"AD/CESSNA 750/1 Bulkhead Web Doubler 9/2004","content":"# AD/CESSNA 750/1 Bulkhead Web Doubler 9/2004\n\nApplicability: Model 750 aircraft, serial numbers 0001 through 0102.\n\nRequirement: 1. Inspect the bulkhead web for an existing round bulkhead web doubler, in accordance with the Accomplishment Instructions of Cessna Service Bulletin SB750-53-19, dated 20 January 2000.\n\nIf there is a round bulkhead web doubler having part number 6711093-38, before further flight, remove the doubler in accordance with the Requirement document.\n\n2. Install a new right bulkhead web doubler having part number 6791213-4 and a left bulkhead web doubler having part number 6791213-3 and enlarge the lightening holes, in accordance with the Accomplishment Instructions of Cessna Service Bulletin SB750-53-19.\n\nNote: FAA AD 2001-07-04 Amdt 39-12169 refers.\n\nCompliance: Before 30 September 2004, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 2 September 2004.\n\nBackground: This Directive requires removal of a certain existing bulkhead web doubler, installation of left and right bulkhead web doublers, and enlargement of the lightening holes. This action is necessary to prevent jamming of the roll control system, due to inadequate clearance between the control cable and web.\n\n![Signature of David Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 13 July 2004\n\n![](image.001.png)","sortOrder":1}],"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 supplied AD text defines applicability (serials 0001–0102) and the required corrective actions; no change or expansion of scope is indicated within this document."},"complexity_factors":["Narrow applicability to a small, identified fleet (Model 750 serials 0001–0102) reduces population complexity","Prescriptive technical steps: inspect, remove a specific part number (6711093-38), install specified parts (6791213-3 and -4), and enlarge lightening holes per SB750-53-19","Safety-critical maintenance work requires certified personnel/facilities and specified parts, creating operational and logistical constraints","Fixed compliance deadline (30 September 2004) imposes scheduling and potential downtime costs on operators","Cross-reference to FAA AD 2001-07-04 indicates alignment with foreign regulator guidance, but adds an extra document to consult"],"plain_english_summary":"This AD requires owners/operators of Cessna 750 (Citation X) aeroplanes, serial numbers 0001–0102, to inspect the bulkhead web, remove any round doubler with part number 6711093-38, and install new left and right doublers (p/n 6791213-3 and -4) and enlarge the lightening holes per Cessna Service Bulletin SB750-53-19. Compliance was required by 30 September 2004. The rule is intended to prevent roll-control cable jamming by restoring adequate clearance; operators bear the inspection and modification cost and must use approved instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted airworthiness directive addressing a specific mechanical defect in a limited production run of aircraft. The scope remains precisely focused on the original safety issue: preventing roll control cable jamming through structural modification."},"complexity_factors":["Single, specific aircraft model and limited serial number range (0001-0102)","Only 2 main requirements with clear conditional logic (if X found, do Y)","Single compliance deadline with simple exception clause","No nested definitions or extensive cross-referencing to other legislation","References only one external technical document (Cessna Service Bulletin SB750-53-19) and one related FAA directive","Straightforward background explanation linking action to safety outcome"],"plain_english_summary":"This CASA safety order applies to early Cessna 750 Citation X (S/Ns 0001–0102) and requires inspection and modification of the bulkhead web: remove the round doubler (P/N 6711093-38) if present, fit new reinforcing plates (P/Ns 6791213-4 and 6791213-3) on both sides, and enlarge specified lightening holes. It prevents roll‑control cable jamming; work must be done before 30 Sept 2004."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-750-1-bulkhead-web-doubler","history":"/api/acts/ad-cessna-750-1-bulkhead-web-doubler/history","analysis":"/api/acts/ad-cessna-750-1-bulkhead-web-doubler/analysis","conflicts":"/api/acts/ad-cessna-750-1-bulkhead-web-doubler/conflicts","importantCases":"/api/acts/ad-cessna-750-1-bulkhead-web-doubler/important-cases","documents":"/api/acts/ad-cessna-750-1-bulkhead-web-doubler/documents"}}