The U.S. aircraft register, updated daily
Parts

Sealplate

No failure report names the sealplate. 5 FAA approvals let 3 companies make a replacement sealplate, Stillman Seal Corporation holding the most (2).

Approved replacement parts 5 parts manufacturer approvals

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

For these models most: Airbus A340 (4).

MakerPartReplacesFitsGrantedStatus
Pats Aircraft LLCSealplate 401-5-017-1401-5-017-1Fokker F28MK0100 limited to serial numbers...2013-08-15current
Stillman SealSealplate DA1075519 D020 21397Airbus A340-311, A340-312, A340-3132007-09-13current
Stillman SealSealplate 89025419 F040 75536Airbus A340-311, A340-312, A340-3132007-09-13current
Stillman Seal CorporationSealplate DA10755Airbus Industrie 19 D020 21397Airbus A340-311, -312, -3131997-03-09current
Stillman Seal CorporationSealplate 890254Airbus Industrie 19 F040 75536Airbus A340-311, -312, -3131997-03-09current

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.