{"id":"F2006B02937","name":"AD/B737/38 - Fuselage Lap Joints BS259 to BS1016","slug":"ad-b737-38-fuselage-lap-joints-bs259-to-bs1016","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42279,"registerId":"commonwealth-F2006B02937-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/38 - Fuselage Lap Joints BS259 to BS1016","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Boeing 737 Series Aeroplanes\n\n \n\nAD/B737/38 Fuselage Lap Joints BS259 to BS1016 5/90\n\nApplicability: Line number 001 to 291 inclusive.\n\n \n\nRequirement: Action in accordance with the technical requirements of FAA AD 89-09-03, paras A to D.\n\n \n\nNote: Incorporation of the repairs/modifications in this Directive partially terminate the requirements of AD/B373/37.\n\n \n\nCompliance: In accordance with the Requirement Document.\n\n \n\nBackground: This Directive requires terminating action for parts of AD/B737/37. This is in recognition that inspection procedures alone may not ensure an adequate level of structural integrity at the skin splices.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted safety directive addressing a specific structural defect in early-model Boeing 737s. It has not expanded beyond its original purpose of mandating repairs to fuselage lap joints."},"complexity_factors":["Extremely short document — only 8 substantive lines","No defined terms section — relies entirely on external FAA document for technical requirements","Single applicability criterion (line numbers 001-291)","No nested exceptions or conditional logic","Cross-reference to only one external document (FAA AD 89-09-03)","Simple termination note regarding one previous directive"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific Boeing 737 aircraft.\n\n**What it does:**\n- **Targets:** Boeing 737 planes with serial numbers (\"line numbers\") 001 to 291 — these are early production models.\n- **Addresses:** A structural problem with **fuselage lap joints** between body station 259 and body station 1016. Think of lap joints as overlapping seams where pieces of the aircraft's skin are joined together. These particular joints are prone to cracking or fatigue.\n- **Requires:** Operators must follow the technical instructions in an American Federal Aviation Administration (FAA) directive (AD 89-09-03, sections A through D). This typically involves inspections, repairs, or modifications to ensure the fuselage doesn't fail.\n- **Replaces part of an older rule:** This directive **partially cancels** requirements from an earlier Australian directive (AD/B737/37). The reason? Simply inspecting these joints wasn't enough to guarantee safety — physical repairs or modifications were needed to properly fix the problem.\n\n**Why it matters:** Fuselage lap joint failures can lead to catastrophic decompression (the \"skin\" of the plane tearing open). This directive ensures older 737s receive permanent structural fixes rather than just ongoing inspections."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"This Directive modifies the effective regulatory obligations compared with the earlier AD by requiring specified repairs/modifications that serve as terminating action for parts of the previous AD (Note; Background). In other words, some prior inspection requirements are replaced (partially terminated) once the new repairs/modifications are incorporated (Note)."},"complexity_factors":["Cross-reference to an external technical document (FAA AD 89-09-03, paras A–D) rather than containing full technical instructions inside the Directive (Requirement).","Limited applicability by aircraft serial/line number (001–291), requiring operators to determine whether each airframe is in scope (Applicability).","Partial termination of requirements from an earlier AD, requiring operators to map old obligations against the new terminating actions (Note; Background).","Compliance is to be effected \"in accordance with the Requirement Document,\" which is not reproduced in this text, creating dependence on an external document for procedural detail (Compliance).","Brief background rationale (inspections may be insufficient) without embedded technical justification or implementation detail, increasing reliance on external technical material and judgment (Background)."],"plain_english_summary":"This Directive, issued by CASA for Boeing 737s line numbers 001–291, requires operators to carry out the repairs/modifications specified in FAA AD 89‑09‑03 (paras A–D) in accordance with the referenced Requirement Document.\n\nCompleting those works partially terminates some obligations of an earlier AD, shifts inspection obligations to a repair/modification outcome, and imposes direct compliance costs on operators who must obtain and follow the FAA and Requirement Document technical guidance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-38-fuselage-lap-joints-bs259-to-bs1016","history":"/api/acts/ad-b737-38-fuselage-lap-joints-bs259-to-bs1016/history","analysis":"/api/acts/ad-b737-38-fuselage-lap-joints-bs259-to-bs1016/analysis","conflicts":"/api/acts/ad-b737-38-fuselage-lap-joints-bs259-to-bs1016/conflicts","importantCases":"/api/acts/ad-b737-38-fuselage-lap-joints-bs259-to-bs1016/important-cases","documents":"/api/acts/ad-b737-38-fuselage-lap-joints-bs259-to-bs1016/documents"}}