AD 2004-23-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer | EMB-135 and -145 | Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 and -145 Series Airplanes |
Unsafe Condition
Separation of the aft baffle assembly from the APU exhaust silencer and consequent separation of the assembly from the airplane, which could cause damage to other airplanes during takeoff and landing operations, or injury to people on the ground.
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Required Actions
Modify the APU exhaust silencer as specified in the applicable service bulletin. Reidentify the part number for the APU exhaust silencer once the modification is accomplished. For certain airplanes, repetitive inspections are required to determine the structural integrity of the APU exhaust silencer, followed by corrective actions if necessary, and eventual modification of the APU exhaust silencer to terminate the inspections.
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Compliance Time
Required as indicated, unless accomplished previously.
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Affected Aircraft
EMBRAER Model EMB-135BJ series airplanes listed in EMBRAER Service Bulletin 145LEG-49-0001, Change 01, dated August 29, 2002; and Model EMB-135 and -145 series airplanes listed in EMBRAER Service Bulletin 145-49-0021, Change 03, dated September 12, 2003; certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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