The U.S. aircraft register, updated daily
Parts

High Heat

No failure report names the high heat. 3 FAA approvals let 2 companies make a replacement high heat, Rubbert Aircraft Services holding the most (2).

Approved replacement parts 3 parts manufacturer approvals

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

For these models most: Piper PA-22 Tri-Pacer and Colt (2), Piper PA-20 Pacer (2), Piper PA-19 (2), Piper PA-18 Super Cub (2), Piper PA-16 Clipper (2), Cessna 172 Skyhawk (1).

MakerPartReplacesFitsGrantedStatus
Rubbert Aircraft ServicesHigh heat O-360 Exhaust Assembly RR-1210-HHModification PartPiper Aircraft PA-16, PA-16S, PA-182021-04-15current
Rubbert Aircraft ServicesHigh heat O-320 Exhaust Assembly RR-1212–HHModification PartPiper Aircraft PA-16, PA-16S, PA-182021-04-15current
Airplains Services CORPHigh Heat Induction Air Kit 1729901Modification partsCessna 172R2007-07-12current

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.