The U.S. aircraft register, updated daily
Parts

Windshield Defogger

No failure report names the windshield defogger. 1 FAA approvals let 1 company make a replacement windshield defogger, Flight Engineering & Development 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 windshield defogger and sell it as an approved part for the models named. These are the companies holding such approvals for a windshield defogger:

For these models most: Learjet 35 (1), Learjet 25 (1), Learjet 24 (1), Learjet 23 (1).

MakerPartReplacesFitsGrantedStatus
Flight Engineering & DevelopmentWindshield Defogger System FED 2000Modification PartLearjet 23 (S/N 070-099), 24, 24A1991-09-19current

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.