Harmonic Filter
No failure report names the harmonic filter. 2 FAA approvals let 2 companies make a replacement harmonic filter, Avtech Tyee INC holding the most (1).
Approved replacement parts 2 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a harmonic filter and sell it as an approved part for the models named. These are the companies holding such approvals for a harmonic filter:
For these models most: Boeing 747 (2).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Avtech Tyee INC | Harmonic Filter 1777-1-3 | S281U101-2 | Boeing 747-400 Series | 2012-05-01 | current |
| Avtech Corporation | Harmonic Filter 1777-1-2 | Boeing S281U101-2 | Boeing 747-400 | 1996-04-01 | 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.