The U.S. aircraft register, updated daily
Parts

Automatic Transfer

No failure report names the automatic transfer. 1 FAA approvals let 1 company make a replacement automatic transfer, Avionics & Aircraft Sys INC holding the most (1).

Approved replacement parts 1 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a automatic transfer and sell it as an approved part for the models named. These are the companies holding such approvals for a automatic transfer:

For these models most: Boeing 727 (1).

MakerPartReplacesFitsGrantedStatus
Avionics & Aircraft Sys INCAutomatic Transfer Switch 4D-0509Modification PartBoeing 727-2001992-09-28current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.