The U.S. aircraft register, updated daily
Parts

Top Wa

No failure report names the top wa. 2 FAA approvals let 2 companies make a replacement top wa, Flight Structures INC 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 top wa and sell it as an approved part for the models named. These are the companies holding such approvals for a top wa:

For these models most: Boeing 777 (2).

MakerPartReplacesFitsGrantedStatus
B/E Aerospace, INC. - FsiTop kit WA015 B215000-009B215000-009Boeing 777-2002016-01-05current
Flight Structures INCTop Kit WA015 B215000-009B215000-009Boeing 777-200 Series2014-03-06current

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.