The U.S. aircraft register, updated daily
Parts

External Hinged

No failure report names the external hinged. 2 FAA approvals let 1 company make a replacement external hinged, Thompson Aero Products holding the most (2).

Approved replacement parts 2 parts manufacturer approvals

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

For these models most: Cessna T210 Turbo Centurion (1), Cessna P210 Pressurized Centurion (1), Cessna 210 Centurion (1), Cessna 177 Cardinal (1).

MakerPartReplacesFitsGrantedStatus
Thompson Aero ProductsExternal Hinged-Plate Spoilers and Dive Brakes Dwg List No. DRC-177-PModification PartCessna 177, 177A, 177B1992-08-12current
Thompson Aero ProductsExternal Hinged-Plate Spoilers and Dive Brakes Dwg List No. DRC-210Modification PartCessna 210G, T210G, 210H1992-08-12current

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.