The U.S. aircraft register, updated daily
Parts

Auxiliary Tank

No failure report names the auxiliary tank. 2 FAA approvals let 2 companies make a replacement auxiliary tank, Unison Industries 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 auxiliary tank and sell it as an approved part for the models named. These are the companies holding such approvals for a auxiliary tank:

For these models most: Boeing 767 (1), Boeing 757 (1), American Champion Aircraft 7 Citabria and Champ (1).

MakerPartReplacesFitsGrantedStatus
Unison IndustriesAuxiliary Tank Conn 9040081Boeing S345T002-156Boeing 757-200, 767-200, -3001991-11-19current
Mckenzie Flying ServiceAuxiliary Tank All parts listed on...Modification PartAmerican Champion 7AC1991-06-05current

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.