Spiral Bevel
No failure report names the spiral bevel. 4 FAA approvals let 2 companies make a replacement spiral bevel, Helicopter Tech INC holding the most (3).
Approved replacement parts 4 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a spiral bevel and sell it as an approved part for the models named. These are the companies holding such approvals for a spiral bevel:
For these models most: Bell 47 (4).
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Helicopter Technology INC | Spiral Bevel, Gear & Pinion, Kit (Fan Drive Gear Sets) R47-620-497-1 | Bell P/N 047-620-497-1 | Bell Helicopter Comp. 47B, 47B-3, 47D | 2011-12-08 | current |
| Helicopter Tech INC | Spiral Bevel, Gear & Pinion, Kit (Fan Drive Gear Sets) R47-620-497-1 | Bell 047-620-497-1 | Bell 47B, 47B-3, 47D | 1998-08-27 | current |
| Helicopter Tech INC | Spiral Bevel Gear (Fan Drive Gear) R47-620-207-1 | Bell 047-620-207-1 | Bell 47B, 47B-3, 47D | 1998-08-26 | current |
| Helicopter Tech INC | Spiral Bevel Pinion (Fan Drive Gear) R47-620-530-1 | Bell 047-620-530-1 | Bell 47B, 47B-3, 47D | 1998-08-26 | 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.