AD NUMBER: 2004-23-09
MANUFACTURER: Empresa
SUBJECT: Airworthiness Directive 2004-23-09
SUMMARY: This amendment supersedes an existing
airworthiness directive (AD), applicable to certain EMBRAER Model
EMB-135 and -145 series airplanes, that currently requires
determining whether a defective auxiliary power unit (APU) exhaust
silencer is installed on the airplane; and corrective actions if
necessary. For certain airplanes, this amendment requires
modification of the APU exhaust silencer, and reidentification of
the part number for the APU exhaust silencer once the modification
is accomplished.