The U.S. aircraft register, updated daily
Parts

Track Retainer

No failure report names the track retainer. 2 FAA approvals let 2 companies make a replacement track retainer, Gemini Engineering INC holding the most (1).

Approved replacement parts 2 parts manufacturer approvals

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

For these models most: Boeing 757 (2).

MakerPartReplacesFitsGrantedStatus
Gemini EngineeringTRACK RETAINER 451N7704-15451N7704-15Boeing 757-200 Series2009-11-15current
Gemini Engineering INCTRACK RETAINER 451N7704-15451N7704-15Boeing 757-200 Series2009-11-15current

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.