The U.S. aircraft register, updated daily
Parts

Acrylic Window

No failure report names the acrylic window. 2 FAA approvals let 1 company make a replacement acrylic window, American Polarizers INC 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 acrylic window and sell it as an approved part for the models named. These are the companies holding such approvals for a acrylic window:

For these models most: Beechcraft E-90 King Air E90 (1), Beechcraft C90 King Air C90 (1), Beechcraft C-99 (1), Beechcraft B-99 (1), Beechcraft 300 King Air 300 (1), Beechcraft 200 King Air 200 (1), Beechcraft 1900 Airliner (1), Beechcraft 100 (1).

MakerPartReplacesFitsGrantedStatus
American Polarizers INCAcrylic Window Shade 4-WB130-0400-AP251411-1, -3Beech Raytheon) (C90, C90A, E901993-03-29current
American Polarizers INCAcrylic Window Shade 4-WB130---0400-AP251411-1, -3Beech Raytheon) (F90, C99, A991992-12-31current

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.