The U.S. aircraft register, updated daily
Parts

Non Essential

No failure report names the non essential. 4 FAA approvals let 2 companies make a replacement non essential, Sierra Nevada Company LLC holding the most (3).

Approved replacement parts 4 parts manufacturer approvals

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

For these models most: Pilatus PC-12 (4).

MakerPartReplacesFitsGrantedStatus
Sierra Nevada Company LLCNon-Essential Radio Rack Communications Equipment and Antennas MDL 4030-0007-22811Modification ArticlePilatus Aircraft Ltd. PC-12/45, PC-12/472024-03-20current
Sierra Nevada Company LLCNon-essential Communications Equipment 0232-00-9416Modification ArticlePilatus Aircraft Ltd. PC-12/47E2024-01-22current
Sierra Nevada Company LLCNon-essential Communications Equipment 0232-00-9416Modification ArticlePilatus Aircraft Ltd. PC-12/47E2023-12-20current
Sierra Nevada CORPNon-essential Communications Equipment (MDL) 0232-00-9416Modification PartsPilatus Aircraft Ltd. PC-12/47E2014-11-06current

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.