Top Directional
No failure report names the top directional. 2 FAA approvals let 2 companies make a replacement top directional, Ryan International CORP 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 top directional and sell it as an approved part for the models named. These are the companies holding such approvals for a top directional:
For these models most: Cirrus SR22 (2), Cirrus SR20 (2).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Avidyne Corporation | Top Directional Antenna Doubler DWG1029-031 | DWG1029-031 | Cirrus Design Corporation SR20, SR22 | 2009-01-19 | current |
| Ryan International CORP | Top Directional Antenna Doubler DWG1029-031 | Modification Part | Cirrus Design Corporation SR20, SR22 | 2004-08-09 | 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.