The U.S. aircraft register, updated daily
Parts

Cylinder Master

No failure report names the cylinder master. 2 FAA approvals let 1 company make a replacement cylinder master, Dowty Aerospace Yakima 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 cylinder master and sell it as an approved part for the models named. These are the companies holding such approvals for a cylinder master:

MakerPartReplacesFitsGrantedStatus
Dowty Aerospace YakimaCylinder-Master 2-7793-1Beech 45AS38401-11Beech Raytheon) (MU3001994-03-29current
Dowty Aerospace YakimaCylinder-Master 2-7793-2Beech 45AS38401-12Beech Raytheon) (MU3001994-03-29current

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.