{"id":"F2009L03439","name":"AD/ERJ-170/10 Amdt 2 - Firewall Hydraulic Shutoff Valves","slug":"ad-erj-170-10-amdt-2-firewall-hydraulic-shutoff-valves","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":141061,"registerId":"commonwealth-F2009L03439-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-170/10 Amdt 2 | Firewall Hydraulic Shutoff Valves | 10/2009 |\n| -------------------- | --------------------------------- | ------- |\n\n| Applicability: | Embraer ERJ-170( ) aircraft fitted with firewall hydraulic shutoff valves (FWSOV) part number (P/N) 975287-3 or P/N 975287-5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Perform an operational check in accordance with Embraer Service Bulletin No.170-29-0013 original issue 12 December 2006, or further ANAC approved revisions, for proper operation of the firewall hydraulic shutoff valves P/N975287-3 or P/N 975287-5. If necessary, replace the faulty hydraulic shutoff valve with a serviceable FWSOV.For the purpose of this AD, an operational check is: “A task to determine that an item is fulfilling its intended purpose. The check does not require quantitative tolerances. This is a failure finding task.”For the purpose of this AD, a suitable FWSOV is a firewall hydraulic shutoff valve P/N 975287-3 or 975287-5 that has passed the operational check described in Embraer SB No. 170-29-0013 or either the replacement of these valves by others bearing a new P/N.Note: Agência Nacional De Aviação Civil - Brazil Airworthiness Directive ADNo. 2007-02-01R2 dated 17 July 2009 refers. |\n| Compliance:    | Remains unchanged as detailed in the original issue of this AD as: Within the next 600 flight hours after 7 June 2007, and thereafter at intervals that do not exceed 600 flight hours.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n|                | This Amendment becomes effective on 24 September 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| Background:    | Periodic operational check of the firewall hydraulic shutoff valves, made during routine maintenance, has revealed that the failure rate of that component is significantly higher than expected. Such a dormant failure, when combined with further possible failures, such as engine fire, may lead to an unacceptable reduction of safety margins.Amendment 1 added an additional part number valve to the applicability section with no change to the requirement section.                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n\n|     | This amendment removes the requirement to replace the FWSOV with one bearing the same P/N.The original issue of this AD became effective 7 June 2007.Amendment 1 of this AD became effective on 25 October 2007. |\n| --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n14 August 2009","sortOrder":0},{"sectionNumber":"AD/ERJ-170/10 Amdt 2","sectionType":"part","heading":"AD/ERJ-170/10 Amdt 2","content":"## AD/ERJ-170/10 Amdt 2","sortOrder":1},{"sectionNumber":"Firewall Hydraulic Shutoff Valves","sectionType":"part","heading":"Firewall Hydraulic Shutoff Valves","content":"## Firewall Hydraulic Shutoff Valves","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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of the AD. Amendment 1 expanded applicability to include an additional part number. Amendment 2 simply relaxes the replacement requirement (allowing newer part numbers). These are refinements to implementation, not scope creep."},"complexity_factors":["Short, single-purpose document (approximately 400 words)","Only 2 defined terms ('operational check' and 'suitable FWSOV')","Minimal cross-referencing — only references one Embraer Service Bulletin and one Brazilian aviation authority directive","Simple conditional logic: check every 600 hours → if faulty, replace → replacement can be same P/N or new P/N","Clear applicability criteria (specific aircraft model + specific part numbers)","No nested exceptions or layered conditions"],"plain_english_summary":"This CASA Airworthiness Directive mandates recurring tests of hydraulic firewall shutoff valves on Embraer ERJ‑170s after discovery of dormant failures that could stop valve operation during an engine fire. Operators must test valves every 600 flight hours using Embraer Service Bulletin 170‑29‑0013 and replace any failed units.\n\nThe amendment permits replacement with either the same part number or an approved newer part, easing compliance. It applies to ERJ‑170s with P/N 975287‑3 or P/N 975287‑5."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment narrows a previous replacement constraint: it removes the requirement that a replaced firewall hydraulic shutoff valve bear the same part number, and confirms inclusion of P/N 975287‑3 and 975287‑5 in applicability (Amendment notes). The inspection requirement, interval (600 flight hours), and the need to follow Embraer Service Bulletin No.170‑29‑0013 remain unchanged."},"complexity_factors":["Targeted scope: applies only to Embraer ERJ‑170 aircraft fitted with FWSOV P/N 975287‑3 or 975287‑5 (Applicability).","External normative reference: requires following Embraer Service Bulletin No.170‑29‑0013 (Requirement), including any ANAC‑approved revisions—operators must access and follow that document.","Operational check is a non‑quantitative, failure‑finding task (Requirement): fewer measurement tolerances simplifies technique but may increase subjective judgement in maintenance records.","Compliance timing tied to original AD effective date: inspections within next 600 flight hours after 7 June 2007 and every 600 flight hours thereafter (Compliance)—operators must track flight hours against that baseline.","Change in allowed replacements: amendment removes prior constraint to replace with same P/N, allowing replacement by valves with a new P/N (Amendment note)—affects parts sourcing and approval workflows.","Regulatory cross‑references and history: builds on original AD, Amendment 1, and refers to ANAC AD No. 2007‑02‑01R2 (Background)—administrative trail may require checking prior documents for full obligations.","Implementation costs and logistics: periodic checks and potential replacements create recurrent maintenance and parts‑availability burdens for operators (Background/Requirement)."],"plain_english_summary":"This amendment requires operators of Embraer ERJ‑170 aircraft fitted with firewall hydraulic shutoff valves P/N 975287‑3 or 975287‑5 to perform an operational (failure‑finding) check per Embraer Service Bulletin No.170‑29‑0013 and to replace any valve that fails the check. It removes the prior requirement that replacements must bear the same part number and keeps the recurring inspection interval at every 600 flight hours, affecting maintenance scheduling and parts procurement for affected operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-erj-170-10-amdt-2-firewall-hydraulic-shutoff-valves","history":"/api/acts/ad-erj-170-10-amdt-2-firewall-hydraulic-shutoff-valves/history","analysis":"/api/acts/ad-erj-170-10-amdt-2-firewall-hydraulic-shutoff-valves/analysis","conflicts":"/api/acts/ad-erj-170-10-amdt-2-firewall-hydraulic-shutoff-valves/conflicts","importantCases":"/api/acts/ad-erj-170-10-amdt-2-firewall-hydraulic-shutoff-valves/important-cases","documents":"/api/acts/ad-erj-170-10-amdt-2-firewall-hydraulic-shutoff-valves/documents"}}