The U.S. aircraft register, updated daily
Parts

Fowler Flap

No failure report names the fowler flap. 4 FAA approvals let 1 company make a replacement fowler flap, Sierra Industries, LTD. holding the most (4).

Approved replacement parts 4 parts manufacturer approvals

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

For these models most: Cessna T-310 (2), Cessna 310 (2), Cessna 340 (1), Cessna 320 (1).

MakerPartReplacesFitsGrantedStatus
Sierra Industries, LTD.Fowler Flap System Kit 31 SeriesModification PartCessna 320E2006-06-22current
Sierra Industries, LTD.Fowler Flap System Kit 31 SeriesModification PartCessna 310G, 310P, T310P2006-06-22current
Sierra Industries, LTD.Fowler Flap System Kit 31 SeriesModification PartCessna 310R, T310R, T310Q (S/Ns T310Q0810 &...2006-06-22current
Sierra Industries, LTD.Fowler Flap System Kit 34 SeriesModification PartCessna 340, 340A2006-06-22current

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.