The U.S. aircraft register, updated daily
Parts

Main Transmission

No failure report names the main transmission. 4 FAA approvals let 3 companies make a replacement main transmission, Goodrich Corporation holding the most (2).

Approved replacement parts 4 parts manufacturer approvals

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

For these models most: Airbus Helicopters AS332 (1).

MakerPartReplacesFitsGrantedStatus
Goodrich CorporationMain Transmission Drive Shaft Assembly 19E232-1A19085Eurocopter Deutschland BO-105LS A-12006-11-27current
Parker Hannifin CORP, Nichols Airborne DivisionMain Transmission Lubrication Pump 4349-2 31-75103-4034-5704A 44 313 029Eurocopter France AS332C AS332C1 AS332L AS332L1 AS332L22004-05-04current
Goodrich CorporationMain Transmission Drive Shaft Assembly 19E232-1A019085Eurocopter Deutschland BO-105LS2003-01-07current
Lucas Aerospace Power TransMain Transmission Drive Shaft Assembly 19E146-1BEurocopter Germany (MBB) 020491Eurocopter Deutschland BO-1051993-03-23current

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.