The U.S. aircraft register, updated daily
Parts

Triplexer

No failure report names the triplexer. 4 FAA approvals let 2 companies make a replacement triplexer, Rockwell Collins INC. holding the most (2).

Approved replacement parts 4 parts manufacturer approvals

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

For these models most: Airbus A350 (2), Maule MXT-7 (1), Maule MX-7 (1), Maule MT-7 (1), Maule M-7 (1), Maule M-6 (1), Maule M-5 (1), Maule M-4 (1), Bellanca 17 Viking (1).

MakerPartReplacesFitsGrantedStatus
Rockwell Collins INC.Triplexer (TPLX-2101) 822-2701-001822-2701-001Airbus A350-10412017-12-19current
Rockwell Collins INC.Triplexer (TPLX-2101) 822-2701-001822-2701-001Airbus A350-9412016-08-03current
Meriden Electronics CORPTriplexer, NT-1A 7099B-47099B-4Maule M-4/C/S/TM, M-4-220C/S, M-4-180C1996-03-30current
Meriden Electronics CORPTriplexer NT-1ANT-1ABellanca 17-30A, 17-31A, & 17-31ATC (TC A18CE)1996-03-30current

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.