The U.S. aircraft register, updated daily
Parts

Main Beam

No failure report names the main beam. 2 FAA approvals let 1 company make a replacement main beam, Burl'S Aircraft LLC holding the most (2).

Approved replacement parts 2 parts manufacturer approvals

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

For these models most: Aeronca 15 (2).

MakerPartReplacesFitsGrantedStatus
Burl'S Aircraft LLCMain Beam Upper Extruded Angle Section BAR/AE-12Mitchell Aircraft Company (Aeronca Aircraft...Aeronca 15AC and S15AC1998-05-28current
Burl'S Aircraft LLCMain Beam Lower Extruded Angle Section BAR/AE-13Mitchell Aircraft Company (Aeronca Aircraft...Aeronca 15AC and S15AC1998-05-28current

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.