SAIB: Electrical Power System – Circuit Breaker Switch

This Special Airworthiness Information Bulletin (SAIB) advises owners and operators of various
airplanes equipped with W31 series switch style circuit breakers (SSCB) manufactured by Tyco
or Potter Brumfield of an airworthiness concern.

Specifically, there have been known continued failures of these SSCBs on Cessna Aircraft Company
airplanes and Beechcraft Corporation (formerly known as Hawker Beechcraft Corporation) airplanes.
These circuit breaker switches may also be installed on other type certificated airplanes as well as
homebuilt airplanes.