The U.S. aircraft register, updated daily
Parts

Bulkhead Phone

No failure report names the bulkhead phone. 3 FAA approvals let 3 companies make a replacement bulkhead phone, Hollingsead International (No Longer Have Pma Production Approval) holding the most (1).

Approved replacement parts 3 parts manufacturer approvals

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

For these models most: Mcdonnell Douglas DC-9 (2), Boeing 727 (1).

MakerPartReplacesFitsGrantedStatus
Airworks INCBulkhead Phone Kit C23PB-5701 Claircom MDL...Modification partMcDonnell Douglas DC-9-82, -832004-08-12current
Airworks INCBulkhead Phone Kit C23PB-5701Claircom C23PB-5701McDonnell Douglas DC-9-82, -831999-05-18current
Hollingsead International (No Longer Have Pma Production Approval)Kit Bulkhead Phone-Flat C23PB-5700Claircom Communications C23PB-5700Boeing 727-200 Series1998-09-17current

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.