The U.S. aircraft register, updated daily
Parts

For Dual

No failure report names the for dual. 3 FAA approvals let 1 company make a replacement for dual, Avcon Industries INC holding the most (3).

Approved replacement parts 3 parts manufacturer approvals

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

For these models most: Learjet 60 (3).

MakerPartReplacesFitsGrantedStatus
Avcon Industries INCKit for Dual GTX-3000 Transponders, GDL-88 Automatic... 03401000-002Modification PartsLearjet 602015-11-23current
Avcon Industries INCKit for Dual GTX-3000 Transponders, GDL-88 Automatic... 03401000-003Modification PartsLearjet 602015-11-23current
Avcon Industries INCKit for Dual GTX-3000 Transponders, GDL-88 Automatic... 03401000-001Modification PartsLearjet 602015-11-23current

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.