{"id":"F2008L04406","name":"AD/ERJ-170/20 - Engine Pylon Bulkhead 1 Fasteners","slug":"ad-erj-170-20-engine-pylon-bulkhead-1-fasteners","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76381,"registerId":"commonwealth-F2008L04406-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-170/20 | Engine Pylon Bulkhead 1 Fasteners | 13/2008 |\n| ------------- | --------------------------------- | ------- |\n\n| Applicability: | Model ERJ 170 aircraft, serial numbers 17000156 through 17000169.                                                                                                                                      |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the requirements of ANAC AD 2008-10-04 Amdt39-1247.Note: Embraer Service Bulletin No. 170-54-0007 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 some aluminium fasteners may have been installed instead of titanium fasteners, at bulkhead 1 of the left and right engine pylons of some Model ERJ 170 aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n5 November 2008","sortOrder":0},{"sectionNumber":"AD/ERJ-170/20","sectionType":"part","heading":"AD/ERJ-170/20","content":"## AD/ERJ-170/20","sortOrder":1},{"sectionNumber":"Engine Pylon Bulkhead 1 Fasteners","sectionType":"part","heading":"Engine Pylon Bulkhead 1 Fasteners","content":"## Engine Pylon Bulkhead 1 Fasteners","sortOrder":2},{"sectionNumber":"13/2008","sectionType":"part","heading":"13/2008","content":"## 13/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive keeps a narrow, specific scope (only serial numbers 17000156–17000169) and mandates actions per the referenced ANAC AD and Embraer service bulletin (Applicability; Requirement). The only modification noted in the text is a revised effective/compliance date of 18 December 2008 (Compliance), not an expansion or narrowing of which aircraft or actions are covered."},"complexity_factors":["Narrow applicability limited to specific serial numbers (Applicability)","Direct cross‑reference to foreign regulator AD (ANAC AD 2008‑10‑04 Amdt39‑1247) rather than reproducing full instructions (Requirement)","Dependence on an external manufacturer service bulletin for procedural detail (Requirement)","Clear technical fix (replace aluminium with titanium fasteners) limits interpretive ambiguity (Background)","Revised effective/compliance date creates timing constraint for operators (Compliance)","Potential operational/logistical burden for affected operators to source titanium fasteners and schedule maintenance (implicit from Requirement/Background)"],"plain_english_summary":"This Airworthiness Directive requires operators of Embraer ERJ‑170 aeroplanes (serial numbers 17000156–17000169) to follow ANAC AD 2008‑10‑04 Amdt39‑1247 (and the Embraer Service Bulletin it cites) to inspect and, if necessary, replace aluminium fasteners found at engine pylon bulkhead 1 with the correct titanium parts (Applicability; Requirement; Background). Operators pay for inspections, parts and repairs. CASA set the compliance date as 18 December 2008, changing maintenance timing and forcing immediate compliance as specified (Compliance)."},"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 limited fleet of aircraft. It has not expanded beyond its original purpose of correcting the fastener substitution error."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (serial number range)","Single requirement referencing external technical document (Embraer Service Bulletin)","No conditional logic or nested exceptions","No cross-references to other legislation beyond the referenced Brazilian AD and Service Bulletin","Straightforward compliance deadline (single fixed date)"],"plain_english_summary":"This AD requires inspection and replacement of fasteners at bulkhead 1 on the engine pylons of 14 specific Embraer ERJ‑170s (serials 17000156–17000169) because aluminium fasteners were installed instead of the required titanium.\n\nOwners/operators must follow Embraer Service Bulletin 170‑54‑0007 (or later approved revisions) as mandated by ANAC; work was to be completed by 18 December 2008. Failure could allow pylon/engine attachment loss, posing a catastrophic safety risk."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-erj-170-20-engine-pylon-bulkhead-1-fasteners","history":"/api/acts/ad-erj-170-20-engine-pylon-bulkhead-1-fasteners/history","analysis":"/api/acts/ad-erj-170-20-engine-pylon-bulkhead-1-fasteners/analysis","conflicts":"/api/acts/ad-erj-170-20-engine-pylon-bulkhead-1-fasteners/conflicts","importantCases":"/api/acts/ad-erj-170-20-engine-pylon-bulkhead-1-fasteners/important-cases","documents":"/api/acts/ad-erj-170-20-engine-pylon-bulkhead-1-fasteners/documents"}}