| GT 23 G | Tap Testing | Non-Destructive Testing |
| Supercedes: None | Superceded By: None |
| Number | Name | State | Country |
| 90054958 | Applied Aerospace Structures Corporation | CA | United States |
| 90050724 | Helicomb International Inc | OK | United States |
| 90127495 | POTEZ AERONAUTIQUE | France | |
| 90077285 | Potez Composites | France |