{"id":"F2006L02492","name":"AD/B737/37 Amdt 1 - Fuselage Lap Joints BS259 to BS1016","slug":"ad-b737-37-amdt-1-fuselage-lap-joints-bs259-to-bs1016","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":59689,"registerId":"commonwealth-F2006L02492-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/37 Amdt 1 | Fuselage Lap Joints BS259 to BS1016 | 9/2006 |\n| ----------------- | ----------------------------------- | ------ |\n\n| Applicability: | Model 737 aircraft, line numbers 1 through 519.                                                                                                                                                                                                                                                                                                                                       |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 88-22-11 R1Amdt 39-6432.Note: Boeing Service Bulletins 737-53A1039 Revision 7 and 737-53-1089 Revision 4 refer. The FAA has approved the modification, inspection, and/or repair procedures contained in these service bulletins as an alternative to the earlier service bulletin issues specified in AD 88-22-11 R1. |\n| Compliance:    | As specified in the Requirement document.                                                                                                                                                                                                                                                                                                                                             |\n|                | This Amendment becomes effective on 31 August 2006.                                                                                                                                                                                                                                                                                                                                   |\n| Background:    | This Directive requires inspection and repair of fuselage lap joints and tear straps that exist on aircraft, particularly with cold bonded joints. Durability of early bonding procedures was found to be unsound.Amendment 1 is issued to introduce a Requirement note that specifies FAA approval of work accomplishment in accordance with the latest service bulletin issues.     |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n19 July 2006","sortOrder":0},{"sectionNumber":"AD/B737/37 Amdt 1","sectionType":"part","heading":"AD/B737/37 Amdt 1","content":"## AD/B737/37 Amdt 1","sortOrder":1},{"sectionNumber":"Fuselage Lap Joints BS259 to BS1016","sectionType":"part","heading":"Fuselage Lap Joints BS259 to BS1016","content":"## Fuselage Lap Joints BS259 to BS1016","sortOrder":2},{"sectionNumber":"9/2006","sectionType":"part","heading":"9/2006","content":"## 9/2006","sortOrder":3}],"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":4,"scope_assessment":{"changed":false,"description":"Amendment 1 does not alter which aircraft are affected (Model 737, line numbers 1–519) nor the mandate to inspect/repair lap joints; it introduces a Requirement note that accepts later Boeing service bulletin issues as FAA‑approved alternatives to earlier issues, i.e. it updates approved procedures rather than expanding scope or adding new aircraft."},"complexity_factors":["Cross-reference to an external FAA airworthiness directive (AD 88-22-11 R1/Amdt 39-6432) shifts technical detail outside the instrument.","Reliance on specific Boeing service bulletins (737-53A1039 Rev 7; 737-53-1089 Rev 4) means compliance depends on reading and applying those technical documents.","Technical nature of required work (inspection/repair of cold-bonded fuselage lap joints and tear straps) requires specialised maintenance capability and judgement.","Amendment changes approved procedure versions rather than prescribing new inspection criteria, creating an administrative tracking burden for operators.","The compliance timing and detailed methods are delegated to the referenced Requirement document and service bulletins rather than set out in this text."],"plain_english_summary":"Requires inspection and repair of fuselage lap joints and tear straps on Boeing 737 aeroplanes, line numbers 1–519, by following the technical requirements of FAA AD 88-22-11 R1/Amdt 39-6432 and FAA‑approved Boeing service bulletins. The Directive targets operators and maintenance organisations, who must perform or pay for the inspections/repairs specified; it updates which service bulletin issues are approved as acceptable procedures and takes effect 31 August 2006."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the airworthiness directive. It does not expand the applicability to additional aircraft or introduce new types of required actions. The amendment simply updates the permitted methods of compliance to reference newer, FAA-approved service bulletin revisions."},"complexity_factors":["Short, single-purpose directive with one primary requirement","Heavy reliance on external documents (FAA AD and Boeing Service Bulletins) rather than spelling out technical details inline","Only one defined applicability criterion (line numbers 1-519)","Simple amendment structure — adds a single note about alternative compliance methods","No nested exceptions or conditional logic within the directive text itself"],"plain_english_summary":"Operators of early-model Boeing 737s (line numbers 1–519) must inspect and repair fuselage lap joints and tear straps between body stations 259–1016 because original “cold bonded” joints can deteriorate and become structurally unsound. This CASA Airworthiness Directive mandates those inspections/repairs to prevent possible fuselage failure. Amendment 1 permits using newer Boeing service bulletins approved by the FAA in meeting the AD’s requirements."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-37-amdt-1-fuselage-lap-joints-bs259-to-bs1016","history":"/api/acts/ad-b737-37-amdt-1-fuselage-lap-joints-bs259-to-bs1016/history","analysis":"/api/acts/ad-b737-37-amdt-1-fuselage-lap-joints-bs259-to-bs1016/analysis","conflicts":"/api/acts/ad-b737-37-amdt-1-fuselage-lap-joints-bs259-to-bs1016/conflicts","importantCases":"/api/acts/ad-b737-37-amdt-1-fuselage-lap-joints-bs259-to-bs1016/important-cases","documents":"/api/acts/ad-b737-37-amdt-1-fuselage-lap-joints-bs259-to-bs1016/documents"}}