Challenges

1. Temperature

1.1. Heating medium

1.2. Compensation to extreme environmental condition

1.3. Temperature monitor/sensors

2. Actuation time

2.1. How to accurately control the composition transition?

3. Actuation type

3.1. Rotary limitation

3.2. Integration with hydraulic/electric designs

4. Reliability

4.1. Maybe not used in safety-critical systems

4.1.1. Cargo door

4.2. Fatigue/Endurance

4.3. Maintenance

4.3.1. How to inspect and troubleshoot

4.4. Vibration resistance

4.5. Safety Standards

4.5.1. FAA