The U.S. aircraft register, updated daily
Parts

Flange And

No failure report names the flange and. 3 FAA approvals let 2 companies make a replacement flange and, Imo Industries INC holding the most (2).

Approved replacement parts 3 parts manufacturer approvals

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

For these models most: Boeing 747 (2), Boeing 767 (1).

MakerPartReplacesFitsGrantedStatus
Rockwell Collins INCFlange and Cap Assembly 2651-232-210-60916-1Boeing 767-200, 767-3002016-06-01current
Imo Industries INCFlange-3" and 4 1/2" Check Valve Assembly 7000-903911boeing 9039-1-1Boeing 747-100B, -200C, -200F1989-07-09current
Imo Industries INCFlange-3" and 4 1/2" Check Valve Assembly 7000-903911boeing 9039-1-1Boeing 747-100B, -200C, -200F1989-07-09current

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.