Flexible Heat

No failure report names the flexible heat. 2 FAA approvals let 1 company make a replacement flexible heat, Bemco INC holding the most (2).

Approved replacement parts 2 parts manufacturer approvals

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

Bemco INC 2

For these models most: Boeing 727 (2).

Maker	Part	Replaces	Fits	Granted	Status
Bemco INC	FLEXIBLE HEAT DUCT BE446-104	BOEING P/N1061446-4, REV. B,DTD 2/26/73	Boeing 727-200	1994-12-12	current
Bemco INC	FLEXIBLE HEAT DUCT BE446-105	BOEING P/N 10-61446-5, REV. B, DTD 2/26/73	Boeing 727-200	1994-12-12	current

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.