AD 97-19-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer S.A. | EMB-145 | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-145 Series Airplanes |
| aircraft | Embraer S.A. | EMB-145ER | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-145 Series Airplanes |
Unsafe Condition
Cracks in the firewall of the auxiliary power unit (APU) due to vibration of the firewall at the location where the recessed area of the shell is spot welded to the firewall. Cracking could result in reduced structural integrity of the fuselage and empennage if fire penetrates the APU firewall.
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Required Actions
Perform an initial visual inspection within 50 flight hours after the effective date to detect APU firewall cracks, followed by repetitive inspections every 100 flight hours if no cracks are found. Repair detected cracks prior to APU operation using an FAA-approved method. Install a visco-elastic damper blanket on the firewall as terminating action for inspection requirements.
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Compliance Time
Within 50 flight hours after the effective date of this AD for the initial inspection, and within 200 flight hours for the visco-elastic damper blanket installation. Repetitive inspections must occur at intervals not exceeding 100 flight hours.
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Affected Aircraft
Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-145 series airplanes, serial numbers 145004 through 145019 inclusive, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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