The U.S. aircraft register, updated daily
Parts

Exhaust Heater

No failure report names the exhaust heater. 4 FAA approvals let 2 companies make a replacement exhaust heater, Wall Colmonoy Corporation holding the most (2).

Approved replacement parts 4 parts manufacturer approvals

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

For these models most: Piper PA-31 Navajo and Chieftain (2), Dehavilland DHC-2 (2).

MakerPartReplacesFitsGrantedStatus
Aero Crafters INCExhaust heater system kit 31-6000Modification PartPiper PA-31-3001994-08-29current
Aero Crafters INCExhaust heater system kit 31T-6000Modification PartPiper PA-31, PA-31-325, -3501994-08-29current
Wall Colmonoy CorporationExhaust Heater Assembly 576deHavilland DHC-2 MK.I1994-04-12current
Wall Colmonoy CorporationEXHAUST HEATER ASSEMBLY 576-Dehavilland DHC-2 MK I1994-04-06current

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.