{"id":"F2009L03368","name":"AD/ERJ-170/24 - Wing Stub Rear Box Vapour Barrier Assembly","slug":"ad-erj-170-24-wing-stub-rear-box-vapour-barrier-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140944,"registerId":"commonwealth-F2009L03368-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Embraer ERJ-170 Series Aeroplanes","sectionType":"division","heading":"Embraer ERJ-170 Series Aeroplanes","content":"### Embraer ERJ-170 Series Aeroplanes\n\n| AD/ERJ-170/24 | Wing Stub Rear Box Vapour Barrier Assembly | 10/2009 |\n| ------------- | ------------------------------------------ | ------- |\n\n| Applicability: | Model ERJ 170-100 STD, -100 LR, -100 SU, -100 SE, -200 STD, -200 SU and-200 LR aircraft, serial numbers 17000002, 17000004 through 17000013 and 17000015 through 17000235.                                                                                                                                                                                                                                                                                             |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of ANAC AD 2009-07-01 Amdt39-1274.Note: Embraer Service Bulletin No.170-57-0036 original issue, or later ANAC approved revision, refers.                                                                                                                                                                                                                                                                                    |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of24 September 2009.                                                                                                                                                                                                                                                                                                                                                                           |\n|                | This Airworthiness Directive becomes effective on 24 September 2009.                                                                                                                                                                                                                                                                                                                                                                                                   |\n| Background:    | The manufacturer has determined that there could be missing sealant on the vapour barrier assembly in the wing stub (centre section) rear box. In the event of fuel tank leakage in the area of the wing stub rear box, and an associated inadequately sealed vapour barrier assembly, the migration of flammable vapours and fluids to the middle electronic bay could occur. In the presence of an ignition source this situation could lead to an uncontained fire. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n12 August 2009","sortOrder":0},{"sectionNumber":"AD/ERJ-170/24","sectionType":"part","heading":"AD/ERJ-170/24","content":"## AD/ERJ-170/24","sortOrder":1},{"sectionNumber":"Wing Stub Rear Box Vapour Barrier Assemb","sectionType":"part","heading":"Wing Stub Rear Box Vapour Barrier Assembly","content":"## Wing Stub Rear Box Vapour Barrier Assembly","sortOrder":2},{"sectionNumber":"10/2009","sectionType":"part","heading":"10/2009","content":"## 10/2009","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 directive maintains its applicability and required corrective action; the only explicit change recorded in the text is a revised effective date of 24 September 2009 (Compliance)."},"complexity_factors":["Cross-reference dependency: required actions are set by ANAC AD 2009-07-01 Amdt39-1274 and Embraer Service Bulletin 170-57-0036 (Requirement).","Narrow, serial-numbered scope: applicability limited to listed ERJ‑170 models/serial ranges, requiring careful operator identification (Applicability).","Technical execution: inspection and sealing work requires appropriate maintenance capability, parts and procedures (Background + Requirement).","Compliance timing: revised effective date (24 September 2009) alters when owners/operators must act (Compliance).","Potential for implementation ambiguity: wording 'Action in accordance with the requirements of ANAC AD ...' requires reading external documents to determine exact tasks and intervals (Requirement)."],"plain_english_summary":"This airworthiness directive requires specified Embraer ERJ‑170 aeroplanes (listed by model and serial number) to have the wing stub rear box vapour barrier assembly inspected and corrected per ANAC AD 2009‑07‑01 Amdt39‑1274 and Embraer Service Bulletin 170‑57‑0036. It applies to owners/operators of the affected serial-numbered aircraft and must be complied with by the effective date (24 September 2009). The measure addresses risk of fuel vapour migrating into the middle electronic bay if the barrier is not properly sealed."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific manufacturing defect in a specific aircraft type. The scope remains tightly focused on the wing stub vapour barrier sealant issue as originally identified."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined elements: applicability (aircraft models/serials), requirement (reference to external ANAC AD), compliance date, and background","Single conditional scenario described in background but no nested legal logic","Heavy reliance on external documents (ANAC AD and Embraer Service Bulletin) — the actual technical requirements are not reproduced in the directive itself","No cross-references to other Australian legislation or regulations within the text","Simple tabular format with clear section headers"],"plain_english_summary":"This CASA airworthiness directive mandates operators of certain Embraer ERJ‑170/175 (-100/-200 series) aircraft to inspect and correct missing sealant on the wing centre‑section vapour barrier. Following ANAC AD 2009‑07‑01 and Embraer SB 170‑57‑0036 by 24 Sept 2009 prevents fuel vapour entering the middle electronic bay and reduces the risk of an in‑flight fire. About 230 aircraft are affected."}},"importantCases":[],"_links":{"self":"/api/acts/ad-erj-170-24-wing-stub-rear-box-vapour-barrier-assembly","history":"/api/acts/ad-erj-170-24-wing-stub-rear-box-vapour-barrier-assembly/history","analysis":"/api/acts/ad-erj-170-24-wing-stub-rear-box-vapour-barrier-assembly/analysis","conflicts":"/api/acts/ad-erj-170-24-wing-stub-rear-box-vapour-barrier-assembly/conflicts","importantCases":"/api/acts/ad-erj-170-24-wing-stub-rear-box-vapour-barrier-assembly/important-cases","documents":"/api/acts/ad-erj-170-24-wing-stub-rear-box-vapour-barrier-assembly/documents"}}