Dual Loop
No failure report names the dual loop. 3 FAA approvals let 1 company make a replacement dual loop, Fenwal Safety Systems holding the most (3).
Approved replacement parts 3 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a dual loop and sell it as an approved part for the models named. These are the companies holding such approvals for a dual loop:
For these models most: Boeing 777 (3).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Fenwal Safety Systems | Dual Loop Sensor 04-100000-701 | S218W401-23 | Boeing 777-200 Series, 777-300 Series | 2004-09-28 | current |
| Fenwal Safety Systems | Dual Loop Sensor 04-100000-708 | S218W401-125 | Boeing 777-200 Series, 777-300 Series | 2004-09-28 | current |
| Fenwal Safety Systems | Dual Loop Sensor 04-100000-702 | S218W401-2 | Boeing 777-200 Series, 777-300 Series | 2004-09-28 | 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.