{"id":"F2006L01671","name":"AD/B737/281 Amdt 1 - Fuselage Stringer 14 Lap Joint at Body Station 727","slug":"ad-b737-281-amdt-1-fuselage-stringer-14-lap-joint-at-body-station-727","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":59401,"registerId":"commonwealth-F2006L01671-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/B737/281 Amdt 1 | Fuselage Stringer 14 Lap Jointat Body Station 727 | 7/2006 |\n| ------------------ | ------------------------------------------------- | ------ |\n\n| Applicability: | Model 737-100, -200 and -200C series aircraft, line numbers 1 through 920, with more than 40,000 total landings.                                                                                                                                                                                                   |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 89-22-04 Amdt39-6355.Accomplishment of Boeing Alert S/B 737-53A1135 Revision 2 or later revision approved by the FAA as an Alternative Means of Compliance (AMOC) is an acceptable Alternative Means of Compliance for the requirements of this AD. |\n| Compliance:    | In accordance with the requirement document, unless already accomplished.                                                                                                                                                                                                                                          |\n|                | This Amendment becomes effective on 6 July 2006.                                                                                                                                                                                                                                                                   |\n| Background:    | This Directive requires inspection of the fuselage stringer 14 lap joint, left and right, at Body station 727 and aft. The actions required by this directive are intended to prevent fuselage structural failure.Amendment 1 is issued to allow the use of an FAA approved Alternate Means of Compliance.         |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n23 May 2006","sortOrder":0},{"sectionNumber":"AD/B737/281 Amdt 1","sectionType":"part","heading":"AD/B737/281 Amdt 1","content":"## AD/B737/281 Amdt 1","sortOrder":1},{"sectionNumber":"Fuselage Stringer 14 Lap Jointat Body St","sectionType":"part","heading":"Fuselage Stringer 14 Lap Jointat Body Station 727","content":"## Fuselage Stringer 14 Lap Joint  \nat Body Station 727","sortOrder":2},{"sectionNumber":"7/2006","sectionType":"part","heading":"7/2006","content":"## 7/2006","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":3,"scope_assessment":{"changed":true,"description":"Amendment 1 does not change which aircraft are covered or the inspection objective; it broadens acceptable ways to comply by permitting FAA‑approved Alternate Means of Compliance (explicitly noting Boeing Alert S/B 737-53A1135 Revision 2 as an acceptable AMOC). This alters compliance options and introduces an approval gate controlled by the FAA rather than changing the substantive inspection requirement."},"complexity_factors":["Targeted applicability criteria (model, line numbers 1–920, >40,000 total landings) — requires accurate fleet records (Applicability).","Normative incorporation of external instrument (FAA AD 89-22-04) and a Boeing Service Bulletin as acceptable AMOC — creates reliance on external documents and approvals (Requirement).","Allowance of FAA-approved Alternate Means of Compliance (AMOC) — introduces administrative discretion and variability in acceptable compliance methods (Amendment 1 / Background).","Operational compliance burden — requires physical inspections of the lap joints and associated record-keeping and maintenance actions (Requirement/Compliance).","Narrow technical focus — single structural location reduces scope but concentrates safety risk and inspection frequency on affected aircraft."],"plain_english_summary":"Requires inspection of the fuselage stringer 14 lap joint (left and right) at body station 727 and aft on Boeing 737-100, -200 and -200C aircraft (line numbers 1–920) that have more than 40,000 total landings. Operators must follow the technical requirements of FAA AD 89-22-04; Amendment 1 allows meeting that requirement via an FAA‑approved Alternate Means of Compliance (for example Boeing Alert S/B 737-53A1135 Rev 2). The measure is aimed at preventing fuselage structural failure."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the airworthiness directive. The change is procedural only — expanding compliance options to include FAA-approved Alternative Means of Compliance (AMOC) rather than restricting operators to the original Boeing service bulletin. The safety objective (inspecting the specific lap joint to prevent structural failure) and the affected aircraft population remain unchanged."},"complexity_factors":["Short, single-purpose directive (approximately 200 words of substantive content)","Only 4 defined/applicable categories: specific aircraft models, line number range, landing count threshold, and specific structural location","Single cross-reference to FAA AD 89-22-04 and Boeing Alert Service Bulletin 737-53A1135","Simple conditional logic: applies IF (model 737-100/-200/-200C AND line numbers 1-920 AND >40,000 landings)","No nested exceptions or complex compliance timelines — compliance follows the referenced FAA document","Technical aviation terminology requires domain knowledge but is standard for the industry"],"plain_english_summary":"This AD mandates inspection of the fuselage stringer 14 lap joint at Body Station 727 on older Boeing 737-100/-200/-200C airframes (line numbers 1–920) with over 40,000 landings to prevent catastrophic fuselage failure. The amendment lets operators use FAA-approved alternative inspection methods (AMOCs) as an acceptable means of compliance, easing implementation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-281-amdt-1-fuselage-stringer-14-lap-joint-at-body-station-727","history":"/api/acts/ad-b737-281-amdt-1-fuselage-stringer-14-lap-joint-at-body-station-727/history","analysis":"/api/acts/ad-b737-281-amdt-1-fuselage-stringer-14-lap-joint-at-body-station-727/analysis","conflicts":"/api/acts/ad-b737-281-amdt-1-fuselage-stringer-14-lap-joint-at-body-station-727/conflicts","importantCases":"/api/acts/ad-b737-281-amdt-1-fuselage-stringer-14-lap-joint-at-body-station-727/important-cases","documents":"/api/acts/ad-b737-281-amdt-1-fuselage-stringer-14-lap-joint-at-body-station-727/documents"}}