AD NUMBER: 2004-01-13
MANUFACTURER: Raytheon
SUBJECT: Airworthiness Directive 2004-01-13
SUMMARY: The FAA supersedes Airworthiness
Directive (AD) 97-22-16, which applies to certain Raytheon Model
1900, 1900C, and 1900D airplanes. AD 97-22-16 currently requires
you to replace the bearings on the vent blower assemblies with
improved design bearings and install a thermal protection device
for the vent blowers. That AD resulted from reports of vent blower
assembly bearings seizing and locking the blower motor on several
of the affected airplanes. This AD retains the actions required in
AD 97-22-16 for certain vent blower assemblies and requires you to
incorporate further product improvement modifications o