The U.S. aircraft register, updated daily
Parts

Cowling Bottom

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

MakerPartReplacesFitsGrantedStatus
Multisciences INCCowling Bottom FWD MI-2006120061Viking Air Limited (Otter) DHC-32019-06-09current
Multisciences INCCowling Bottom Rear MI-2006220062Viking 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.