Door Balance
No failure report names the door balance. 2 FAA approvals let 1 company make a replacement door balance, Triumph Engine Control Systems, LLC 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 door balance and sell it as an approved part for the models named. These are the companies holding such approvals for a door balance:
For these models most: Boeing 747 (2).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Triumph Engine Control Systems, LLC | Door Balance System Life Raft Compartment Assy 532000-4 | 60B50057-4 | The Boeing Company 747-100 SERIES, 747-200B SERIES,... | 2020-04-15 | current |
| Triumph Engine Control Systems, LLC | Door Balance System Life Raft Compartment Assy 532000-3 | 60B50057-3 | The Boeing Company 747-100 SERIES, 747-200B SERIES,... | 2020-04-15 | 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.