{"id":"F2008L01247","name":"AD/ERJ-190/4 - Inertial Reference Unit and Primary Flight Displays","slug":"ad-erj-190-4-inertial-reference-unit-and-primary-flight-displays","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":73485,"registerId":"commonwealth-F2008L01247-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Embraer ERJ-190 Series Aeroplanes","sectionType":"division","heading":"Embraer ERJ-190 Series Aeroplanes","content":"### Embraer ERJ-190 Series Aeroplanes\n\n| AD/ERJ-190/4 | Inertial Reference Unit andPrimary Flight Displays | 5/2008 |\n| ------------ | -------------------------------------------------- | ------ |\n\n| Applicability: | All ERJ-190 aircraft models.                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | If not previously accomplished, remove the wiring connections from pins 51 and 52 in the electrical connectors of both Inertial Reference Units (IRU) in accordance with the procedures in Embraer Service Bulletin 190-34-0009 original issue dated 26 February 2007, or later revision approved by the Brazilian Agência Nacional de Aviação Civil (ANAC). |\n|                | Note: ANAC AD 2007-08-04 refers.                                                                                                                                                                                                                                                                                                                             |\n| Compliance:    | Before 27 February 2009.                                                                                                                                                                                                                                                                                                                                     |\n|                | This Airworthiness Directive becomes effective on 8 May 2008.                                                                                                                                                                                                                                                                                                |\n| Background:    | The ANAC has advised of reports of IRU failures which lead to an erroneous flight path angle (FPA) indication on both primary flight displays, with no alert to this condition to the crew. On ERJ-190 aircraft, FPA is considered as important as pitch and bank angle for piloting purposes.                                                               |\n|                | Since this condition affects flight safety, this Directive requires wiring changes which will improve IRU functionality.                                                                                                                                                                                                                                     |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n13 March 2008","sortOrder":0},{"sectionNumber":"AD/ERJ-190/4","sectionType":"part","heading":"AD/ERJ-190/4","content":"## AD/ERJ-190/4","sortOrder":1},{"sectionNumber":"Inertial Reference Unit andPrimary Fligh","sectionType":"part","heading":"Inertial Reference Unit andPrimary Flight Displays","content":"## Inertial Reference Unit and  \nPrimary Flight Displays","sortOrder":2},{"sectionNumber":"5/2008","sectionType":"part","heading":"5/2008","content":"## 5/2008","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 targeted safety directive addressing a specific technical fault in a specific aircraft type. The scope remains precisely limited to the wiring modification required to address the IRU failure mode described in the background."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Single, specific technical requirement (disconnect two specific pins)","Only one defined term implicitly referenced (Inertial Reference Unit)","No nested exceptions or conditional logic beyond the 'if not previously accomplished' clause","Clear cross-reference to a single external technical document (Embraer Service Bulletin)","Straightforward compliance deadline with no alternative methods or phased implementation"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires operators of Embraer ERJ-190 aircraft to modify wiring on both Inertial Reference Units by disconnecting wires from pins 51 and 52, to prevent unannounced incorrect flight path angle indications on primary flight displays.  \n\nAffected operators in Australia had to comply (per Embraer Service Bulletin 190-34-0009 or ANAC-approved revision); the AD took effect 8 May 2008 with work required before 27 February 2009."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument, as stated, applies to all ERJ‑190 models and mandates removal of wiring connections from pins 51 and 52 per Embraer Service Bulletin 190‑34‑0009 (or later ANAC‑approved revision). The text shows no indication that the applicable aircraft set, required action, or deadline departs from the stated remedial purpose; no change of scope from the directive's stated corrective intent is evident in the supplied text."},"complexity_factors":["Mandatory technical wiring change on safety‑critical equipment (IRUs) — requires qualified maintenance personnel and access to parts/procedures","Fleet‑wide applicability (all ERJ‑190 aircraft) creates aggregate operational scheduling and downtime burden","Dependence on manufacturer service bulletin for procedures and on ANAC approval for later revisions introduces regulatory coordination","Fixed compliance deadline (before 27 Feb 2009) compresses planning for operators","Verification and recordkeeping obligations implicit in AD compliance increase administrative steps"],"plain_english_summary":"This directive requires operators of all Embraer ERJ‑190 aeroplanes to remove wiring connections from pins 51 and 52 on both inertial reference units, following Embraer Service Bulletin 190‑34‑0009 (or later ANAC‑approved revision), to stop erroneous flight‑path‑angle displays. The modification must be done before 27 February 2009. The cost, labour and downtime fall to aircraft operators, and compliance depends on following the service bulletin and any ANAC‑approved revisions (Applicability; Requirement; Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-erj-190-4-inertial-reference-unit-and-primary-flight-displays","history":"/api/acts/ad-erj-190-4-inertial-reference-unit-and-primary-flight-displays/history","analysis":"/api/acts/ad-erj-190-4-inertial-reference-unit-and-primary-flight-displays/analysis","conflicts":"/api/acts/ad-erj-190-4-inertial-reference-unit-and-primary-flight-displays/conflicts","importantCases":"/api/acts/ad-erj-190-4-inertial-reference-unit-and-primary-flight-displays/important-cases","documents":"/api/acts/ad-erj-190-4-inertial-reference-unit-and-primary-flight-displays/documents"}}