{"id":"F2008L03708","name":"AD/B737/342 - Lavatory Water Supply","slug":"ad-b737-342-lavatory-water-supply","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75421,"registerId":"commonwealth-F2008L03708-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/B737/342 | Lavatory Water Supply | 12/2008 DM |\n| ----------- | --------------------- | ---------- |\n\n| Applicability: | Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes, certificated in any category; as identified in Boeing Alert Service Bulletin737-38A1054, dated August 23, 2007.                                                                                                                                                                                                                                                                                                             |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2008-17-13 Amdt 39-15651.Note: Boeing Alert Service Bulletin 737-38A1054 dated August 23, 2007 or later approved FAA document.                                                                                                                                                                                                                                                                                                         |\n| Compliance:    | As specified in the requirement document.                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 5 November 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| Background:    | The FAA have received a report of a separated hose assembly for the passenger water system. This directive is issued to prevent a water leak into the flight deck ceiling, which could result in an electrical short and possible loss of several functions essential to safe flight. This directive requires replacing the existing straight-to-90-degree hose assembly for the Lavatory ''A'' water supply. The replacement is a new straight hose assembly and a separate 90-degree elbow fitting. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n3 October 2008","sortOrder":0},{"sectionNumber":"AD/B737/342","sectionType":"part","heading":"AD/B737/342","content":"## AD/B737/342","sortOrder":1},{"sectionNumber":"Lavatory Water Supply","sectionType":"part","heading":"Lavatory Water Supply","content":"## Lavatory Water Supply","sortOrder":2},{"sectionNumber":"12/2008 DM","sectionType":"part","heading":"12/2008 DM","content":"## 12/2008 DM","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect. The scope remains precisely limited to the identified hose assembly issue on specified aircraft models."},"complexity_factors":["Very short document (under 300 words)","Only 1 substantive requirement (hose replacement)","No defined terms section","Minimal conditional logic — applies to specific aircraft models only","Single cross-reference to external FAA document for technical details","No exceptions, exemptions, or nested provisions"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Boeing 737 Classic series (‑100, ‑200/200C, ‑300, ‑400, ‑500) to replace a lavatory water hose assembly to eliminate a failure that can leak water onto the flight‑deck ceiling. The mandated hardware change (straight hose plus elbow, per FAA AD and Boeing service bulletin) prevents water ingress that could cause electrical shorts and disable critical flight systems."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive keeps a narrow safety scope: it targets the lavatory “A” water‑supply hose assembly on the listed 737 models and prescribes a specific hardware replacement to prevent water ingress into the flight‑deck ceiling. It does not broaden applicability beyond the identified models or add unrelated requirements."},"complexity_factors":["Narrow applicability to specific Boeing 737 sub‑models listed in the AD","Mandates compliance with an external FAA AD (2008‑17‑13) and a Boeing Alert Service Bulletin (737‑38A1054)","Technical action is a mechanical replacement (hose + elbow) requiring parts procurement and maintenance access","Compliance timing (effective date 5 November 2008) creates scheduling and operational‑downtime considerations","Allowance for later FAA‑approved documents introduces limited regulatory discretion in acceptable procedures"],"plain_english_summary":"This Airworthiness Directive requires operators of the listed Boeing 737‑100, ‑200, ‑200C, ‑300, ‑400 and ‑500 series aeroplanes to replace the existing straight‑to‑90° lavatory “A” water hose assembly with a straight hose plus a separate 90° elbow, following the technical actions in FAA AD 2008‑17‑13 and Boeing Alert Service Bulletin 737‑38A1054. The stated purpose is to prevent a hose separation that could leak water into the flight‑deck ceiling, risk an electrical short and loss of flight‑essential functions. Operators pay for parts, maintenance labour and downtime and must comply by the effective date."},"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-b737-342-lavatory-water-supply","history":"/api/acts/ad-b737-342-lavatory-water-supply/history","analysis":"/api/acts/ad-b737-342-lavatory-water-supply/analysis","conflicts":"/api/acts/ad-b737-342-lavatory-water-supply/conflicts","importantCases":"/api/acts/ad-b737-342-lavatory-water-supply/important-cases","documents":"/api/acts/ad-b737-342-lavatory-water-supply/documents"}}