这三个警告太像了，触发条件也不是很容易区别。空客的解释还是比较好懂的，基本就是：
ENG 1(2) FADEC FAULT: FWS 失去与 EEC 之间通讯
ENG 1(2) FADEC SYS FAULT: EEC 通道故障
ENG 1(2) CTL SYS FAUL: 发动机本身的故障
具体细节参考 TechRequest 原文：
Q:
What's the difference among ENG 1(2) FADEC SYS FAULT, ENG 1(2) FADEC FAULT, and ENG 1(2) CTL SYS FAULT?
A:
As per design, the NG x FADEC warnings apply to issues of the FADEC system whereas the ENG x messages are used to designate failure at engine level.
For your information, the ENG 1(2) FADEC FAULT appears when the Flight Warning System lost communication with the EEC whereas the ENG 1(2) FADEC SYS FAULT indicates that a NO GO issue has been detected on one EEC channel.
Finally, the ENG 1(2) CTL SYS FAULT is triggered if one of the following failure mode is detected bv the EEC:
- Inability to measure N1 or N2 speed parameters (the engine's thrust is then forced to IDLE).
- Issues with fuel flow management (FMV position lost, FMV drive lost, HMU calibration data lost). The engine will then respond slowly to a thrust change request.
- Issues with the air system management (leakage or blockage of the P30 Pipe or inability to control one or more IP or HP bleed valve or failure of the VSV system). The Engine cannot withstand rapid thrust changes.
- Thrust Control Malfunction Cutback activation (the EEC reduces the engine's thrust by applying a fuel flow reduction to the engine).
