The U.S. aircraft register, updated daily
Parts

Heat Diffuser

No failure report names the heat diffuser. 2 FAA approvals let 2 companies make a replacement heat diffuser, Keystone Helicopter Corporation holding the most (1).

Approved replacement parts 2 parts manufacturer approvals

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

For these models most: Sikorsky S-76 (1), Construcciones Aeronauticas Sa C-212 (1).

MakerPartReplacesFitsGrantedStatus
Aero Twin INCHeat Diffuser AT-212-73131-1212-73131.1EADS CASA C-212-CB C-212-CC, C-, 212-CD2014-10-30current
Keystone Helicopter CorporationHeat Diffuser Instl 33776-5490833776-54908Sikorsky S76C2001-06-10current

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.