AD 2004-26-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer | ERJ 170 | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170 Series Airplanes |
Unsafe Condition
Temporary or possible sustained loss of all modular avionics units (MAUs), which triggers a cascade of failures in systems dependent on MAU functionalities.
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Required Actions
Revise the airplane flight manual (AFM) to include operational instructions and prohibit dispatch with the integrated electronic standby system (IESS) inoperative. Perform a test to determine proper operation of the network interface card (NIC) communications and repair if necessary. Install a specific software version of the PRIMUS EPIC system, after which the AFM revision must be removed.
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Compliance Time
Before further flight
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Affected Aircraft
Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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