AD 2011-21-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer | Various | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Airplanes |
Unsafe Condition
Cracking in the firewall of the auxiliary power unit (APU), which could result in reduced structural integrity of the fuselage and empennage in the event that a fire penetrates through the firewall of the APU.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct repetitive detailed inspections for cracking of the rearward and forward face of the APU firewall, and repair if necessary.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 3,300 flight hours
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135ER, -135KE, -135KL, -135LR, EMB-145, -145ER, -145MR, -145LR, -145MP, and -145EP airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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