The U.S. aircraft register, updated daily
Parts

Bottom Fuselage

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

MakerPartReplacesFitsGrantedStatus
Multisciences INCBottom Fuselage Fairing RH MI-2002420024Viking Air Limited (Otter) DHC-32019-06-09current
Multisciences INCBottom Fuselage Fairing LH MI-2002320023Viking Air Limited (Otter) DHC-32019-06-09current

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.