{"id":"F2007L04735","name":"AD/B747/368 - Station 1241 Bulkhead Fittings","slug":"ad-b747-368-station-1241-bulkhead-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":71223,"registerId":"commonwealth-F2007L04735-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/368 | Station 1241 Bulkhead Fittings | 2/2008 DM |\n| ----------- | ------------------------------ | --------- |\n\n| Applicability: | Boeing Model 747-100, -200, 747SR, 747SP and 747-300 aircraft.                                                                                                                                                                                                                                                                                                                            |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Perform initial and repeat inspections of the STA 1241 bulkhead fittings just above the canted pressure deck and other actions in accordance with the accomplishment instructions of Boeing Alert Service Bulletin 747-53A2658, dated February 22, 2007 or later revision approved by the FAA as an Alternative Method of Compliance (AMOC).Note: FAA AD 2007-25-17 Amdt 39-15299 refers. |\n| Compliance:    | As specified in Boeing Alert Service Bulletin 747-53A2658.                                                                                                                                                                                                                                                                                                                                |\n|                | This Airworthiness Directive becomes effective on 14 January 2008.                                                                                                                                                                                                                                                                                                                        |\n| Background:    | This Airworthiness Directive results from a report that an operator found a 1.65-inch crack on the station (STA) 1241 bulkhead fitting on the left side of a 747-200F aircraft that had accumulated 17,332 total flight cycles. This AD is issued to detect and correct cracking in the STA 1241 bulkhead fittings, which could result in reduced structural integrity of the aircraft.   |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n12 December 2007","sortOrder":0},{"sectionNumber":"AD/B747/368","sectionType":"part","heading":"AD/B747/368","content":"## AD/B747/368","sortOrder":1},{"sectionNumber":"Station 1241 Bulkhead Fittings","sectionType":"part","heading":"Station 1241 Bulkhead Fittings","content":"## Station 1241 Bulkhead Fittings","sortOrder":2},{"sectionNumber":"2/2008 DM","sectionType":"part","heading":"2/2008 DM","content":"## 2/2008 DM","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific safety defect in a specific aircraft component. It has not expanded beyond its original purpose of mandating inspections for cracking in STA 1241 bulkhead fittings on specified Boeing 747 models."},"complexity_factors":["Single, specific technical requirement (inspect one component)","Only 5 aircraft models covered with clear applicability","References external technical document (Boeing Service Bulletin) rather than detailing procedures in the text itself","No nested exceptions or conditional logic","Minimal defined terms (only standard aviation abbreviations like STA for 'station')","Short document (approximately 200 words of substantive content)"],"plain_english_summary":"This CASA Airworthiness Directive orders operators of Boeing 747-100/-200/‑300/‑SR/‑SP types to inspect the STA 1241 bulkhead fitting above the canted pressure deck for cracking, following Boeing Alert Service Bulletin 747-53A2658. It affects airlines and maintenance crews responsible for those aircraft; the inspections aim to detect and fix structural cracks before they compromise safety. Effective 14 January 2008."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to detecting and correcting cracking in STA 1241 bulkhead fittings on the listed 747 models and requires compliance with Boeing Alert Service Bulletin 747‑53A2658 or an FAA‑approved later revision (Applicability; Requirement; Compliance). Nothing in the text expands or narrows that stated objective beyond requiring inspections and allowing FAA‑approved AMOCs (Background; Requirement)."},"complexity_factors":["Targeted applicability to specific 747 models (Applicability) — narrows which operators must act.","Technical inspection and repair instructions are delegated to an external Boeing Alert Service Bulletin (Requirement / Compliance) — operators must obtain and follow that document.","Initial plus repeat inspection intervals and unspecified \"other actions\" increase ongoing maintenance burden (Requirement).","Allowance for FAA‑approved Alternative Methods of Compliance (AMOC) introduces regulatory discretion and an approval step (Requirement).","Clear effective date (14 January 2008) imposes a fixed compliance start (Compliance).","Root cause: reported 1.65‑inch crack at STA 1241 on a high‑cycle aircraft (Background) — justifies targeted structural inspection but implicates lifecycle/cycle counting systems for operators.","Potential direct costs to operators for inspections, repairs and recordkeeping (implied by Requirement/Compliance referencing the Service Bulletin)."],"plain_english_summary":"Requires operators of Boeing 747-100, -200, -300, -SP and -SR aircraft to perform initial and repeat inspections of the STA 1241 bulkhead fittings and any corrective actions set out in Boeing Alert Service Bulletin 747‑53A2658 (or a later FAA‑approved revision). The directive is intended to detect and correct cracking at that location because cracking could reduce the aircraft's structural integrity; compliance follows the Service Bulletin timetable and may use an FAA‑approved AMOC."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-368-station-1241-bulkhead-fittings","history":"/api/acts/ad-b747-368-station-1241-bulkhead-fittings/history","analysis":"/api/acts/ad-b747-368-station-1241-bulkhead-fittings/analysis","conflicts":"/api/acts/ad-b747-368-station-1241-bulkhead-fittings/conflicts","importantCases":"/api/acts/ad-b747-368-station-1241-bulkhead-fittings/important-cases","documents":"/api/acts/ad-b747-368-station-1241-bulkhead-fittings/documents"}}