{"id":"F2009L02196","name":"AD/ERJ-170/23 - Airframe Structural Components","slug":"ad-erj-170-23-airframe-structural-components","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140393,"registerId":"commonwealth-F2009L02196-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-170/23 | Airframe Structural Components | 7/2009 |\n| ------------- | ------------------------------ | ------ |\n\n| Applicability: | Model ERJ 170-100 LR, ERJ 170-100 SE, ERJ 170-100 STD and ERJ 170-100 SU aircraft.Model ERJ 170-200 LR, ERJ 170-200 STD, and ERJ 170-200 SU aircraft.                                                                                                                                                                                                                                                                                       |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of ANAC AD 2009-04-01 Amdt39-1264.                                                                                                                                                                                                                                                                                                                                                               |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of2 July 2009.                                                                                                                                                                                                                                                                                                                                                      |\n|                | This Airworthiness Directive becomes effective on 2 July 2009.                                                                                                                                                                                                                                                                                                                                                                              |\n| Background:    | Cracks were detected in some structural components during ERJ 170 aircraft full scale fatigue testing. Analysis of the cracking has resulted in modifications to the aircraft Airworthiness Limitation Items to include new inspections tasks or modification of existing ones, and respective thresholds and intervals. Undetected fatigue cracking in the affected areas could adversely affect the structural integrity of the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n19 May 2009","sortOrder":0},{"sectionNumber":"AD/ERJ-170/23","sectionType":"part","heading":"AD/ERJ-170/23","content":"## AD/ERJ-170/23","sortOrder":1},{"sectionNumber":"Airframe Structural Components","sectionType":"part","heading":"Airframe Structural Components","content":"## Airframe Structural Components","sortOrder":2},{"sectionNumber":"7/2009","sectionType":"part","heading":"7/2009","content":"## 7/2009","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with narrow, specific scope — addressing fatigue cracking in particular aircraft models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 4 defined elements: applicability (aircraft models), requirement (reference to external document), compliance date, and background","Single cross-reference to external Brazilian aviation authority document (ANAC AD 2009-04-01)","No nested conditional logic or exceptions","Straightforward mandatory action with fixed deadline","Technical content is contained in referenced external document rather than this instrument itself"],"plain_english_summary":"This CASA Airworthiness Directive makes a Brazilian ANAC safety alert legally binding in Australia, requiring owners/operators of Embraer ERJ-170-100/200 series regional jets to carry out specified inspections and modifications. It responds to fatigue cracking discovered in structural tests and imposes revised inspection schedules to detect and repair cracks early, protecting airframe integrity and safety. Compliance was required by 2 July 2009."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The Directive expands the scope of Airworthiness Limitation Items by adding new inspection tasks or modifying existing ones and by changing thresholds and intervals, following detection of cracks in full‑scale fatigue testing. Compliance now requires operators to adopt those added/modified inspections and any associated structural modifications as specified in ANAC AD 2009‑04‑01 Amdt39‑1264 (effective 2 July 2009)."},"complexity_factors":["Cross-reference to an external authority document (ANAC AD 2009‑04‑01 Amdt39‑1264) — requires users to consult and follow another regulator’s detailed requirements.","Technical aviation content (fatigue cracking, Airworthiness Limitation Items) — requires specialist maintenance knowledge to interpret and implement.","Applicability across multiple ERJ‑170 variants — maintenance planners must identify affected fleet subsets.","Mandated changes to maintenance programs and inspection thresholds/intervals — creates scheduling and record‑keeping implications.","Fixed effective date (2 July 2009) — creates a clear compliance deadline and potential short lead times for operators."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Embraer ERJ‑170 models to carry out the actions set out in ANAC AD 2009‑04‑01 Amdt39‑1264. Mechanically, it amends the aircraft Airworthiness Limitation Items by adding or changing inspection tasks and by revising thresholds and intervals. The stated purpose is to find fatigue cracks uncovered in full‑scale testing; that purpose imposes direct costs and downtime on aircraft owners and maintenance organisations who must update maintenance programs and perform the new or modified inspections."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-erj-170-23-airframe-structural-components","history":"/api/acts/ad-erj-170-23-airframe-structural-components/history","analysis":"/api/acts/ad-erj-170-23-airframe-structural-components/analysis","conflicts":"/api/acts/ad-erj-170-23-airframe-structural-components/conflicts","importantCases":"/api/acts/ad-erj-170-23-airframe-structural-components/important-cases","documents":"/api/acts/ad-erj-170-23-airframe-structural-components/documents"}}