The U.S. aircraft register, updated daily
Parts

Circumferential Tube

No failure report names the circumferential tube. 1 FAA approvals let 1 company make a replacement circumferential tube, Airtomic - A Dover Company (Formerly Cook Airtomic) holding the most (1).

Approved replacement parts 1 parts manufacturer approvals

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

MakerPartReplacesFitsGrantedStatus
Airtomic - A Dover Company (Formerly Cook Airtomic)Circumferential Tube Assy. 504004A01GE Part No. 9210M17G01,2, 9144M38G01, 9101M52G01General Electric CF6-45A, AZ, CF6-50A2010-12-20current

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.