AD NUMBER: 2005-12-11
MANUFACTURER: Boeing SUBJECT: Airworthiness Directive 2005-12-11 SUMMARY: The FAA is adopting a new airworthiness
directive (AD) for certain Boeing Model 757-200 series airplanes.
This AD requires modifying the frequency converters located in the
closet assembly in the passenger compartment, and making various
wiring changes in and between the closet assembly and forward
purser work station. This AD also requires modifying the in-flight
entertainment system prior to or concurrently with the modification
of the frequency converters.This AD is prompted by a certification
review that revealed a frequency converter failure mode not
identified in the original system design. We are issuing this AD to
prevent a short circuit between the frequency converter output and
the distribution circuit breakers, which could result inoverheating
and failure of adjacent wiring and consequent adverse effects on
other systems sharing the affected wire bundle.