Table 2.
LRUs' failure data.
| Failure mode | Control communication (LRU1) | Gas switch (LRU2) | Trigger (LRU3) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Failure cause | Quantity | Influence | Failure cause | Quantity | Influence | Failure cause | Quantity | Influence | |
| Hard failure | Communication blocking | 3 | Restart | Communication blocking | 3 | Restart | Communication blocking | 1 | Restart |
| Software failure | 3 | Restart | Electromagnetic interference | 3 | Restart | Electromagnetic interference | 1 | Restart | |
| Electromagnetic interference | 6 | Restart | Barometric instability | 2 | Delay time | Unstable pilot tube pressure | 1 | Delay time | |
|
| |||||||||
| Soft failure | PLC controller damaged | 3 | Cancel | Insulation performance degradation | 8 | Cancel | Pilot tube performance degradation | 10 | Cancel |
|
| |||||||||
| Total | 17 | 16 | 13 | ||||||