The U.S. aircraft register, updated daily
Parts

Avionics

No failure report names the avionics. 2 FAA approvals let 2 companies make a replacement avionics, Lone Star Aviation CORP 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 avionics and sell it as an approved part for the models named. These are the companies holding such approvals for a avionics:

For these models most: Downer 14 (1), Champion 7 Citabria and Champ (1), Bellanca 17 Viking (1), Aeronca S7 (1), Aeronca S11 (1).

MakerPartReplacesFitsGrantedStatus
Lone Star Aviation CORPAvionics, Electronics (1) Port Blower LS03-02040 12vdc LS03-02041 24vdcModification PartAlexandria Aircraft, LLC. 14-19, 14-19-2, 14-19-32010-04-11current
Air Methods CORP InternationalAvionics MDL 179-9060Modification PartEurocopter Deutschland MBB BK 117, B21994-06-28current

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.