The U.S. aircraft register, updated daily
Parts

Sight Plug

No failure report names the sight plug. 6 FAA approvals let 2 companies make a replacement sight plug, Vickers INC, Systems Monitoring Div holding the most (4).

Approved replacement parts 6 parts manufacturer approvals

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

For these models most: Sikorsky S-76 (2), Boeing 767 (2), Sikorsky S-61 (1).

MakerPartReplacesFitsGrantedStatus
Eaton Aerospace LLCSight Plug PS53JPS53JBoeing 767-2C Series2019-02-12current
Eaton Aerospace LLCSight Plug S50PS50PBoeing 767-2C Series2019-02-12current
Vickers INC, Systems Monitoring DivSight Plug S126FGeneral Electric 7080M93P01General Electric CF-61997-09-22current
Vickers INC, Systems Monitoring DivSight Plug PS51CSikorsky S761995-10-03current
Vickers INC, Systems Monitoring DivSight Plug PS51ESikorsky S761995-10-03current
Vickers INC, Systems Monitoring DivSight Plug S51TSikorsky S6135-66325-1Sikorsky S61N1995-10-03current

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.