Scale
No failure report names the scale. 4 FAA approvals let 2 companies make a replacement scale, Gm Nameplate holding the most (2).
Approved replacement parts 4 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a scale and sell it as an approved part for the models named. These are the companies holding such approvals for a scale:
For these models most: Bombardier DHC-8 Dash 8 and Q400 (2), Boeing 757 (1), Boeing 727 (1).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| 3 Points Aviation | Scale Assy, Elevator Trim 83910081-003-3PA | 83910081-003 | Bombardier DHC-8-100 Series, DHC-8-200 Series | 2021-02-05 | current |
| 3 Points Aviation | Scale Assy, Elevator Trim 83910081-007-3PA | 83910081-007 | Bombardier DHC-8-300 Series | 2021-02-05 | current |
| Gm Nameplate | SCALE BAC27DBY0153 | BAC27DBY0153 | Boeing 727 & 737 Series | 2006-01-27 | current |
| Gm Nameplate | SCALE BAC27NBY91 | BAC27NBY91 | Boeing 757 Series | 2006-01-27 | 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.