The U.S. aircraft register, updated daily
Parts

Subkit

No failure report names the subkit. 5 FAA approvals let 2 companies make a replacement subkit, Electronic Cable Specialists holding the most (4).

Approved replacement parts 5 parts manufacturer approvals

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

For these models most: Boeing 737 (5).

MakerPartReplacesFitsGrantedStatus
B/E Aerospace INCSubkit, CMU-101 Upgrade Termination B737-ACARS-907B386-0219-200The Boeing Company 737-700/ -800 Series2016-01-07current
Electronic Cable SpecialistsSUBKIT, Mechanical Installation 234-02-0001-001IR-01Modification PartBoeing 737-200, 737-300, 737-4002010-03-02current
Electronic Cable SpecialistsSUBKIT, Flight Deck Wiring 234-02-0001-001IR-02Modification PartBoeing 737-200, 737-300, 737-4002010-03-02current
Electronic Cable SpecialistsSUBKIT, Aircraft Wiring 234-02-0001-001IR-04Modification PartBoeing 737-200, 737-300, 737-4002010-03-02current
Electronic Cable SpecialistsSUBKIT, Equipment Bay Wiring 234-02-0001-001IR-03Modification PartBoeing 737-200, 737-300, 737-4002010-03-02current

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.