The U.S. aircraft register, updated daily
Parts

Sealing Plate

No failure report names the sealing plate. 2 FAA approvals let 2 companies make a replacement sealing plate, Simmonds Precision Products INC Goodrich Sensors and Integrated Systems - Vt holding the most (1).

Approved replacement parts 2 parts manufacturer approvals

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

For these models most: Boeing 747 (1).

MakerPartReplacesFitsGrantedStatus
Optimum Engineering & ManufacturingSealing Plate Z1-100-144-011-100-144-01Honeywell T5313B, T5317A, T5317A-12003-01-13current
Simmonds Precision Products INC Goodrich Sensors and Integrated Systems - VtSealing Plate 50181-1301-0103No Unique Part NumberBoeing 747-100, -100B, -100B SUD1997-08-07current

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.