The U.S. aircraft register, updated daily
Parts

Reference Air

No failure report names the reference air. 1 FAA approvals let 1 company make a replacement reference air, Ada Manufacturing holding the most (1).

Approved replacement parts 1 parts manufacturer approvals

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

MakerPartReplacesFitsGrantedStatus
Ada ManufacturingReference Air Manifold 70473Modification partPratt & Whitney R-985-AN-1 & R-985-14B2013-03-13current

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.