{"id":"F2006B02885","name":"AD/B737/183 - Fuselage Lap Joints","slug":"ad-b737-183-fuselage-lap-joints","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42227,"registerId":"commonwealth-F2006B02885-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \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 CAR 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\nBoeing 737 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/B737/183 Fuselage Lap Joints 7/2002","sectionType":"part","heading":"AD/B737/183 Fuselage Lap Joints 7/2002","content":"# AD/B737/183 Fuselage Lap Joints 7/2002\n\nApplicability: Model 737-200 and \\-200C aircraft, line numbers 1 through 291.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 2002-07-11 Amdt 39-12705.\n\nNote: Boeing Service Bulletin 737-53A1177 Revision 6 refers.\n\nCompliance: As specified in the Requirement document, with a revised effective date of 11 July 2002.\n\nThis Airworthiness Directive becomes effective on 11 July 2002.\n\nBackground: This Directive requires repetitive inspections of certain fuselage lap joint areas, repair of any cracking found, and an eventual terminating modification of those areas. Such cracking, unless detected and corrected, could result in rapid decompression of the aircraft.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 27 May 2002\n\n![](image.001.png)","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This Directive adopts the FAA AD's technical requirements for the same aircraft subset and does not expand applicability beyond Boeing 737-200/-200C, line numbers 1–291. The AD references the FAA document and Boeing service bulletin for procedural details, so scope remains the same as the published requirement (Applicability; Requirement; Note)."},"complexity_factors":["Limited technical scope: targets specific models and line numbers (Applicability).","Cross-reference to external normative documents — FAA AD 2002-07-11 and Boeing Service Bulletin 737-53A1177 Rev 6 — requiring operators to obtain and follow those documents (Requirement; Note).","Multiple action types: repetitive inspections, repairs if cracking found, and a terminating modification (Requirement; Background).","Compliance timing is governed by the referenced FAA AD, not fully specified in this instrument, creating dependence on external compliance schedules (Requirement; Compliance).","Regulatory enforcement is by CASA under CAR 1998 subreg 39.1(1), creating potential for administrative discretion in compliance oversight (preamble/signature).","Operational impact: inspections and modifications imply aircraft downtime and direct maintenance costs borne by operators (Background; Requirement)."],"plain_english_summary":"This Airworthiness Directive requires repetitive inspections, repair of any cracking found, and an eventual terminating modification to fuselage lap joints on Boeing 737-200 and -200C aircraft, line numbers 1–291. Operators must follow the technical requirements of FAA AD 2002-07-11 and the Boeing service bulletin, with compliance effective 11 July 2002. (Applicability; Requirement; Compliance.)\n\nOperators pay for inspections, repairs and modification work; CASA’s delegate enforces the AD under CAR 1998 subreg 39.1(1). Non-compliance leaves the aircraft subject to regulatory action and continued structural risk. (Background; signature.)"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It targets a specific airworthiness issue (fuselage lap joint cracking) in a limited population of aircraft (early production 737-200 series). The document does not expand beyond this original safety purpose."},"complexity_factors":["Very short document (approximately 250 words)","Only 3 defined applicability criteria (model 737-200, 737-200C, line numbers 1–291)","Single requirement that cross-references external technical documents (FAA AD 2002-07-11 and Boeing Service Bulletin) rather than setting out detailed instructions in the text itself","No nested exceptions or conditional logic within the AD text itself","Simple linear structure: Applicability → Requirement → Compliance → Background","Relies entirely on incorporated external documents for technical detail, which are not reproduced"],"plain_english_summary":"This AD mandates repeated inspections, repairs of cracks, and eventual installation of a permanent fix for lap-joint areas on early-production Boeing 737-200 and 737-200C aircraft (line numbers 1–291).  \n\nIt affects operators and maintenance organisations and is enforced by CASA to prevent cracks that could cause rapid decompression; compliance follows FAA AD 2002-07-11 and Boeing Service Bulletin 737-53A1177 Rev.6, effective 11 July 2002."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-183-fuselage-lap-joints","history":"/api/acts/ad-b737-183-fuselage-lap-joints/history","analysis":"/api/acts/ad-b737-183-fuselage-lap-joints/analysis","conflicts":"/api/acts/ad-b737-183-fuselage-lap-joints/conflicts","importantCases":"/api/acts/ad-b737-183-fuselage-lap-joints/important-cases","documents":"/api/acts/ad-b737-183-fuselage-lap-joints/documents"}}