## Common ground
All options refer to specialized stands used for handling, transporting, or securing aircraft engines.
## Options at a glance
**8428.90 – Mechanical handling**
- **Defining trait:** Equipped with mechanical systems (e.g., hydraulics, motors) for lifting, rotating, or moving engines.
- **Typical examples:** Hydraulic engine hoists, motorized rotating stands, automated loading platforms.
- **Best fit when:** The stand actively moves or positions the engine using power-driven mechanisms.
**8716.80 – Non-mechanically propelled**
- **Defining trait:** Designed for safe transport and storage without mechanical propulsion; relies on manual effort or static support.
- **Typical examples:** Manual rolling stands, fixed cradles, non-powered transport trolleys.
- **Best fit when:** The stand is used only for moving or storing engines by hand or with minimal force.
## Key differences
| Feature | 8428.90 – Mechanical handling | 8716.80 – Non-mechanically propelled |
|-----------------------|-------------------------------------|--------------------------------------|
| Power source | Motorized/hydraulic | Manual or static |
| Movement capability | Active (lifting, rotating, conveying)| Passive (rolling, supporting) |
| Use case | Dynamic handling in maintenance | Transport and storage |
## How to choose
- Does the stand use motors, hydraulics, or electric systems? → 8428.90
- Is it moved only by hand or left stationary? → 8716.80
## Overlaps & pitfalls
A stand may have both mechanical features (e.g., a hydraulic lift) and manual wheels—this could fit both codes. However, if the primary function is active movement (lifting/rotating), prioritize **8428.90**. If it’s mainly for static support or manual rolling, use **8716.80**. The main function determines the correct classification; if unclear, choose based on the dominant feature