AD 2005-23-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer | EMB-135 | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 Airplanes, and Model EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP Airplanes |
Unsafe Condition
Discovery of a hole in the upper frame of the firewall for the auxiliary power unit (APU).
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Required Actions
Modify the APU firewall upper frame, part number 145-51249-001 or 120-10731-001, in accordance with the Accomplishment Instructions of EMBRAER Service Bulletin 145LEG-53-0020, Revision 01, or EMBRAER Service Bulletin 145-53-0057, Revision 01, as applicable.
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Compliance Time
Within 2,500 flight hours or 365 days after the effective date of this AD, whichever occurs later.
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Affected Aircraft
EMBRAER Model EMB-135BJ airplanes, as identified in EMBRAER Service Bulletin 145LEG-53-0020, Revision 01; and Model EMB-135ER, -135KE, -135KL, and -135LR airplanes, and Model EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP airplanes, as identified in EMBRAER Service Bulletin 145-53-0057, Revision 01, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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