The U.S. aircraft register, updated daily
Parts

Roto Master

No failure report names the roto master. 8 FAA approvals let 2 companies make a replacement roto master, Machen INC holding the most (6).

Approved replacement parts 8 parts manufacturer approvals

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

For these models most: Piper PA-60 Aerostar (6), Mooney M-20 (2).

MakerPartReplacesFitsGrantedStatus
M20 Turbos INCRoto-Master scavenge pump 101633-31 (or) RJI025-2ModificationMooney Aircraft M20 E, F, J installed Lycoming...1998-10-21current
M20 Turbos INCRoto-Master turbocharger 600573-00 (or) RJ0326-11ModificationMooney Aircraft M20 E, F, J insatlled with Lycoming...1998-10-21current
Machen INCRoto Master Turbo Charger 600803-0001, -0002Piper 600803-0001, -0002Aerostar Aircraft PA-60-700P1991-07-18current
Machen INCRoto Master Turbo Charger 600532-0001, -0002Piper 600532-0001, -0002Aerostar Aircraft PA-60-6011991-07-18current
Machen INCRoto Master Turbo Charger 600726-0001, -0002Piper 600726-0001, -0002Aerostar Aircraft PA-60-602P1991-07-18current
Machen INCRoto Master Turbo Charger 600574-0001, -0002Piper 600574-0001, -0002Aerostar Aircraft PA-60-601P (S/N 0456 & Up)1991-07-18current
Machen INCRoto Master Turbo Charger 600575-0001, -0002Piper 600575-0001, -0002Aerostar Aircraft PA-60-601P (S/N 0456 & Up)1991-07-18current
Machen INCRoto Master Acutator 250001-04Piper 980186-01Aerostar Aircraft PA-60-601, -601P, -602P1991-07-02current

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.