Assessment of an Anomaly Detector for Jet Engine Health Monitoring

Table 3

List of considered abrupt events—FC stands for fault code.

FC	Description	Magnitude 𝑓𝑚	SW/SE ratio 𝑓𝑟
1	Fan fault	1 to 5%	+(0.5 to 2.0)
2	lpc fault	1 to 5%	+(0.5 to 2.0)
3	hpc fault	1 to 5%	+(0.5 to 2.0)
4	hpt fault	1 to 5%	±(0.5 to 2.0)
5	lpt fault	1 to 5%	±(0.5 to 2.0)
6	vbv fault	1 to 5	/
7	vsv fault	1 to 5	/
8	𝑃13 bias	±1 to 5𝜎	/
9	𝑇26 bias	±1 to 5𝜎	/
10	𝑃3 bias	±1 to 5𝜎	/
11	𝑇3 bias	±1 to 5𝜎	/
12	𝑁lp bias	±1 to 5𝜎	/
13	𝑁hp bias	±1 to 5𝜎	/
14	𝑇49 bias	±1 to 5𝜎	/
15	𝑊𝑓 bias	±1 to 5𝜎	/
16	𝑃2 bias	±1 to 5𝜎	/
17	𝑇2 bias	±1 to 5𝜎	/
18	Water-wash	Restore fan, lpc, and hpc perfs.
19	hpt service	Restore hpt perfs.
20	lpt service	Restore lpt perfs.