Unloader Valve
No failure report names the unloader valve. 6 FAA approvals let 1 company make a replacement unloader valve, Carleton Technologies INC holding the most (6).
Approved replacement parts 6 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a unloader valve and sell it as an approved part for the models named. These are the companies holding such approvals for a unloader valve:
For these models most: Boeing 777 (3), Boeing 747 (2), Boeing 767 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Carleton Technologies INC | Unloader Valve Assembly B44364-1 | S478W004-1 | Boeing 767-300 series | 2004-06-21 | current |
| Carleton Technologies INC | Unloader Valve Assembly B44364-1 | S478W004-1 | Boeing 777-200 series, 777-300 series | 2004-06-21 | current |
| Carleton Technologies INC | Unloader Valve Assembly B44364-1 | S478W004-1 | Boeing 747-400 series, 747-400D series,... | 2004-06-21 | current |
| Carleton Technologies INC | Unloader Valve Assembly B44364-1 | S478W004-1 | Boeing 777-200 series, 777-300 series | 2004-05-20 | current |
| Carleton Technologies INC | Unloader Valve Assembly B44364-1 | S478W004-1 | Boeing 747-400 series, 747-400D series,... | 2004-05-20 | current |
| Carleton Technologies INC | Unloader Valve Assembly B44364-1 | S478W004-1 | Boeing 777-200 series, 777-300 series | 2004-02-10 | 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.