| Pos. | spare part no | Name |
| A | - | Two-stage planetary gear set - rear |
| B | - | Single stage planetary gear set - front |
| 1 | - | Clutch C2 |
| 2 | - | Brake B2 |
| 3 | - | Freewheel F2 |
| 4 | - | Reverse drive gear |
| 5 | - | Brake B1 |
| 6 | - | Coupling C1 |
| 7 | - | Clutch C3 |
| 8 | - | Hydraulic pump |
| 9 | - | input shaft |
| 10 | - | Differential assembly |
| 11 | - | Reverse gear assembly |
| 12 | - | Satellites |
| 13 | - | sun gears |
| 14 | - | ring gear |
| 15 | - | Satellite |
| 16 | - | sun gears |
| 17 | - | ring gear |
The AW F21 gearbox uses 2 planetary gears: one-stage and two-stage. Gears of this type are called Ravignaux planetary gears and provide a choice of 6 forward gears and 1 reverse gear.
The engine torque as a result of the inclusion of one or more clutches is transmitted to 2 planetary gears. Both planetary gears are torque controlled by the brake clutches, allowing a choice of 6 forward gears and 1 reverse gear. Gear ratios of steps:
| Broadcast | 1st gear | 2nd gear | 3rd gear | 4th gear | 5th gear | 6th gear | Reverse gear |
| Gear ratio | 4,148 | 2,370 | 1,556 | 1,155 | 0,859 | 0,686 | 3,394 |
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