The U.S. aircraft register, updated daily
Parts

Shaft External

No failure report names the shaft external. 1 FAA approvals let 1 company make a replacement shaft external, Jet Tech Engineering 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 shaft external and sell it as an approved part for the models named. These are the companies holding such approvals for a shaft external:

For these models most: Learjet 25 (1).

MakerPartReplacesFitsGrantedStatus
Jet Tech EngineeringShaft-External Drive JTE6222962229Learjet 25/35/36/552002-03-24current

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.