{"id":"F2008L01519","name":"AD/B747/375 - Main Equipment Centre Dripshield","slug":"ad-b747-375-main-equipment-centre-dripshield","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119922,"registerId":"commonwealth-F2008L01519-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/375 | Main Equipment Centre Dripshield | 6/2008 |\n| ----------- | -------------------------------- | ------ |\n\n| Applicability: | Model 747-400 series aircraft, as identified in Boeing Alert Service Bulletin 747-25A3526 original issue, or later FAA approved revision.Model 747-400F aircraft, as identified in Boeing Alert Service Bulletin 747-25A3370 Revision 1, or later FAA approved revision.                                                                                                                                                                           |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2008-08-25 Amdt 39-15479.                                                                                                                                                                                                                                                                                                                                                           |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of 5 June 2008.                                                                                                                                                                                                                                                                                                                                                            |\n|                | This Airworthiness Directive becomes effective on 5 June 2008.                                                                                                                                                                                                                                                                                                                                                                                     |\n| Background:    | The FAA received a report that accumulated water from the drip shield above the M826 Card File in the main equipment centre entered the card file and damaged a circuit card, causing the AFT CARGO FIRE MSG message to be illuminated and resulting in an air turn back. This Directive requires installation of drains and drain tubes to eliminate water accumulation in the drip shield and possible damage to circuit cards in the card file. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n23 April 2008","sortOrder":0},{"sectionNumber":"AD/B747/375","sectionType":"part","heading":"AD/B747/375","content":"## AD/B747/375","sortOrder":1},{"sectionNumber":"Main Equipment Centre Dripshield","sectionType":"part","heading":"Main Equipment Centre Dripshield","content":"## Main Equipment Centre Dripshield","sortOrder":2},{"sectionNumber":"6/2008","sectionType":"part","heading":"6/2008","content":"## 6/2008","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":false,"description":"The AD adopts the FAA AD 2008-08-25 technical requirements for the identified Boeing 747-400 and 747-400F aircraft. The instrument does not broaden the described applicability; the only explicit modification in this text is a revised effective date of 5 June 2008. Applicability remains tied to aircraft identified in the cited Boeing Alert Service Bulletins."},"complexity_factors":["Direct cross-reference to FAA AD 2008-08-25 rather than standalone technical text","Applicability depends on identification lists in Boeing Alert Service Bulletins","Technical maintenance work (installing drains/drain tubes) requiring parts, skilled labour and shop time","Operational impact: required work may cause aircraft downtime and certification paperwork","Narrow, model-specific applicability reduces regulatory reach but increases technical specificity","Compliance deadline (revised effective date 5 June 2008) creates scheduling constraints for operators","Enforcement and legal effect through Civil Aviation Safety Authority delegation"],"plain_english_summary":"This Directive requires installation of drains and drain tubes in the main equipment centre dripshield on specified Boeing 747-400 and 747-400F aircraft (as identified in the listed Boeing Alert Service Bulletins). It adopts the technical requirements of FAA AD 2008-08-25 and becomes effective 5 June 2008. The action fixes water ingress into the M826 card file that previously damaged a circuit card and illuminated an AFT CARGO FIRE warning; aircraft operators must fund and perform the maintenance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard single-issue Airworthiness Directive addressing a specific safety defect. It has not expanded beyond its original purpose of requiring drip shield drainage modifications."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability categories (747-400 and 747-400F)","Single requirement: comply with external FAA directive","No nested exceptions or conditional logic","No internal cross-references to other legislation","Straightforward compliance deadline"],"plain_english_summary":"This CASA Airworthiness Directive mandates that operators of specified Boeing 747-400 and 747-400F aircraft install drains and drain tubes in the Main Equipment Centre to stop water from reaching electronic circuit cards. It responds to an in‑flight water leak that caused a false aft cargo fire warning and forced a diversion. Affected operators must follow the FAA service instructions (FAA AD 2008‑08‑25) by 5 June 2008."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-375-main-equipment-centre-dripshield","history":"/api/acts/ad-b747-375-main-equipment-centre-dripshield/history","analysis":"/api/acts/ad-b747-375-main-equipment-centre-dripshield/analysis","conflicts":"/api/acts/ad-b747-375-main-equipment-centre-dripshield/conflicts","importantCases":"/api/acts/ad-b747-375-main-equipment-centre-dripshield/important-cases","documents":"/api/acts/ad-b747-375-main-equipment-centre-dripshield/documents"}}