The U.S. aircraft register, updated daily
Parts

Ac Ballast

No failure report names the ac ballast. 2 FAA approvals let 2 companies make a replacement ac ballast, Avtech Tyee INC holding the most (1).

Approved replacement parts 2 parts manufacturer approvals

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

MakerPartReplacesFitsGrantedStatus
Avtech Tyee INCAC-Ballast 8179-19304500-349Saab AB, Saab Aerosystems Model SAAB 20002012-05-01current
Avtech CorporationAC-BALLAST 8179-1SAAB 9304500-349Saab Aircraft AB 2000 Series1994-10-19current

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.