{"id":"F2008L04405","name":"AD/ERJ-170/19 - Ram Air Turbine Machined Support","slug":"ad-erj-170-19-ram-air-turbine-machined-support","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76379,"registerId":"commonwealth-F2008L04405-current","compilationNumber":null,"startDate":"2026-04-02","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-170/19 | Ram Air Turbine Machined Support | 13/2008 |\n| ------------- | -------------------------------- | ------- |\n\n| Applicability: | Model ERJ 170 aircraft, serial numbers 17000002, 17000004 through 17000013, and 17000015 through 17000208.                                                                           |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the requirements of ANAC AD 2008-10-05 Amdt39-1248.Note: Embraer Service Bulletin No. 170-53-0057 original issue, or later ANAC approved revision, refers. |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of18 December 2008.                                                                                          |\n|                | This Airworthiness Directive becomes effective on 18 December 2008.                                                                                                                  |\n| Background:    | The manufacturer has determined that cracks may develop in the ram air turbine (RAT) machined support, due to the downlock pin not being withdrawn during the retraction of the RAT. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n5 November 2008","sortOrder":0},{"sectionNumber":"AD/ERJ-170/19","sectionType":"part","heading":"AD/ERJ-170/19","content":"## AD/ERJ-170/19","sortOrder":1},{"sectionNumber":"Ram Air Turbine Machined Support","sectionType":"part","heading":"Ram Air Turbine Machined Support","content":"## Ram Air Turbine Machined Support","sortOrder":2},{"sectionNumber":"13/2008","sectionType":"part","heading":"13/2008","content":"## 13/2008","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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined elements: applicability (specific serial numbers), requirement (reference to external document), compliance date, and background","No nested conditional logic or exceptions","Single cross-reference to external technical documents (ANAC AD and Embraer Service Bulletin)","No interpretation section or defined terms","Straightforward command structure: identify affected aircraft → reference external standard → comply by date"],"plain_english_summary":"This mandatory Airworthiness Directive requires operators of certain Embraer ERJ‑170 aircraft to inspect and repair the ram air turbine (RAT) machined support after reports that the downlock pin may not fully withdraw on retraction, leading to cracks and potential RAT failure in an emergency.  \n\nCompliance follows ANAC AD 2008‑10‑05 and Embraer Service Bulletin 170‑53‑0057 for the affected serial numbers; the Australian directive took effect 18 December 2008."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to the specific ERJ-170 serial numbers listed and mandates actions per ANAC AD 2008-10-05 (Amdt39-1248). The text shows a revised effective/compliance date (18 December 2008) but does not alter the listed applicability or broaden the affected aircraft set (Applicability; Compliance; Requirement)."},"complexity_factors":["Cross-reference to an external regulator document (ANAC AD 2008-10-05 Amdt39-1248) — requires consulting and following another authority's mandatory instructions (Requirement).","Specific serial-number applicability — affects only the enumerated ERJ-170 airframes, so tracking applicability is administrative (Applicability).","Safety-critical technical issue — relates to potential cracks in the RAT machined support caused by downlock pin not withdrawn during retraction, requiring inspection/repair actions (Background).","Reference to manufacturer service bulletin (Embraer SB No. 170-53-0057) as acceptable method — introduces dependence on a service document or later ANAC-approved revision (Requirement note).","Revised effective/compliance date — requires operators to meet a specified compliance calendar (Compliance).","Regulatory enforcement through CASA delegate signature — establishes regulator-led mandatory compliance (signature/date)."],"plain_english_summary":"Requires specified Embraer ERJ‑170 aeroplanes to comply with ANAC AD 2008‑10‑05 (Amdt39‑1248) addressing potential cracking of the ram air turbine (RAT) machined support caused when the downlock pin is not withdrawn during RAT retraction. Applies only to the listed serial numbers; aircraft operators must carry out the prescribed actions and meet the revised compliance/effective date of 18 December 2008. (Applicability; Requirement; Background; Compliance)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-erj-170-19-ram-air-turbine-machined-support","history":"/api/acts/ad-erj-170-19-ram-air-turbine-machined-support/history","analysis":"/api/acts/ad-erj-170-19-ram-air-turbine-machined-support/analysis","conflicts":"/api/acts/ad-erj-170-19-ram-air-turbine-machined-support/conflicts","importantCases":"/api/acts/ad-erj-170-19-ram-air-turbine-machined-support/important-cases","documents":"/api/acts/ad-erj-170-19-ram-air-turbine-machined-support/documents"}}