Third Window
No failure report names the third window. 3 FAA approvals let 2 companies make a replacement third window, Ptm International INC holding the most (2).
Approved replacement parts 3 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a third window and sell it as an approved part for the models named. These are the companies holding such approvals for a third window:
For these models most: Piper PA-23 Apache and Aztec (3).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Ptm International INC | Third window 717-43 | Modification Part | Piper PA-23, PA-23-160, PA-23-235 | 1999-12-12 | current |
| Ptm International INC | Third window 717-44 | Modification Part | Piper PA-23, PA-23-160, PA-23-235 | 1999-12-12 | current |
| Southwest Aero-Mods INC | Third Window in Aircraft Cabin Left and Right Unknown | Unknown | Piper PA-23, PA-23-160, PA-23-235 | 1993-08-26 | 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.