The U.S. aircraft register, updated daily
Parts

Piston Gear

No failure report names the piston gear. 2 FAA approvals let 1 company make a replacement piston gear, Airight INC 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 piston gear and sell it as an approved part for the models named. These are the companies holding such approvals for a piston gear:

For these models most: Piper PA-31 Navajo and Chieftain (2).

MakerPartReplacesFitsGrantedStatus
Airight INCPiston-Gear Actuating Cyl. 2115002Wiebel Tool Co 2115002-1Piper PA-31-300, PA-31-310, PA-31-325 S/N...1994-05-25current
Airight INCPiston-Gear Actuating Cyl. 292302Ozone 292302-1Piper PA-31-300, PA-31-310, PA-31-325 S/N...1994-05-25current

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.