Challenges

1. Temperature

1.1. Heating medium

1.2. Compensation to extreme environmental condition

1.3. Temperature monitor/sensors

2. Reliability

2.1. Maybe not used in safety-critical systems

2.1.1. Cargo door

2.2. Fatigue/Endurance

2.3. Maintenance

2.3.1. How to inspect and troubleshoot

2.4. Vibration resistance

2.5. Safety Standards

2.5.1. FAA

3. Actuation time

3.1. How to accurately control the composition transition?

4. Actuation type

4.1. Rotary limitation

4.2. Integration with hydraulic/electric designs