Table 1. The description of aircraft engine measurement data.

	Symbol	Description	Units
1	alt	Altitude	ft
2	Mach	Flight Mach number	–
3	TRA	Throttle-resolver angle	%
4	T2	Total temperature at fan inlet	° R
5	Wf	Fuel flow	pps
6	Nf	Physical fan speed	rpm
7	Nc	Physical core speed	rpm
8	T24	Total temperature at LPC outlet	° R
9	T30	Total temperature at HPC outlet	° R
10	T48	Total temperature at HPT outlet	° R
11	T50	Total temperature at LPT outlet	° R
12	P15	Total pressure in bypass-duct	psia
13	P21	Total pressure at fan outlet	psia
14	P24	Total pressure at LPC outlet	psia
15	Ps30	Static pressure at HPC outlet	psia
16	P40	Total pressure at burner outlet	psia
17	P50	Total pressure at LPT outlet	psia
18	T40	Total temp. at burner outlet	° R
19	P30	Total pressure at HPC outlet	psia
20	P45	Total pressure at HPT outlet	psia
21	W21	Fan flow	pps
22	W22	Flow out of LPC	lbm/s
23	W25	Flow into HPC	lbm/s
24	W31	HPT coolant bleed	lbm/s
25	W32	HPT coolant bleed	lbm/s
26	W48	Flow out of HPT	lbm/s
27	W50	Flow out of LPT	lbm/s
28	epr	Engine pressure ratio (P50/P2)	–
29	SmFan	Fan stall margin	–
30	SmLPC	LPC stall margin	–
31	SmHPC	HPC stall margin	–
32	NRf	Corrected fan speed	rpm
33	NRc	Corrected core speed	rpm
34	PCNfR	Percent corrected fan speed	pct
35	phi	Ratio of fuel flow to Ps30	pps/psi
36	fan_eff_mod	Fan efficiency modifier	–
37	fan_flow_mod	Fan flow modifier	–
38	LPC_eff_mod	LPC efficiency modifier	–
39	LPC_flow_mod	LPC flow modifier	–
40	HPC_eff_mod	HPC efficiency modifier	–
41	HPC_flow_mod	HPC flow modifier	–
42	HPT_eff_mod	HPT efficiency modifier	–
43	HPT_flow_mod	HPT flow modifier	–
44	LPT_eff_mod	LPT efficiency modifier	–
45	LPT_flow_mod	HPT flow modifier	–