The U.S. aircraft register, updated daily
Parts

Rotor Gear

0 failure reports named the rotor gear in the last ten years, 3 since 1995. 8 FAA approvals let 2 companies make a replacement rotor gear, Hartzell Engine Technologies LLC holding the most (6).

Reports by year

0001111995111997
Reports by year, as a table
reports
19951
19961
19971

Approved replacement parts 8 parts manufacturer approvals

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

For these models most: Northrop C-125 (1), Beechcraft A100 (1).

MakerPartReplacesFitsGrantedStatus
Hartzell Engine Technologies LLCRotor Gear ES3828K3828Lycoming Engines AEIO-540-D4A5, AEIO-540-D4B5, AEIO-540-D4D52024-05-20current
Hartzell Engine Technologies LLCRotor Gear ES3827K3827Lycoming Division... O-290-D, O-290-D2, O-290-D2A2024-05-20current
Hartzell Engine Technologies LLCRotor Gear ES3827K3827Continental... A-50-1, A-50-4, A-50-52024-05-20current
Hartzell Engine Technologies LLCRotor Gear ES3827K3827Continental Motors Inc A-40, A-40-2, A-40-32024-05-20current
Hartzell Engine Technologies LLCRotor Gear ES3827K3827Lycoming Engines O-235-C1, O-235-C1A, O-235-C1B2024-05-20current
Hartzell Engine Technologies LLCRotor Gear ES3828K3828Continental... A100-2, C-115-1, C-115-22024-05-20current
Kelly Aerospace Energy Systems LLCRotor Gear ES3827Champion Aerospace/Unison/ Slick M3827Textron Lycoming O-235-C1, -C1B, -C2A2017-02-27current
Kelly Aerospace Energy Systems LLCRotor Gear ES3828Champion Aerospace/Unison/ Slick M3828Continental Motors C-145-2 -2H, -2HP, E-165-22017-02-27current

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.