T-45A UJPT, E2-C2, ADV, & IUT Eng-02
Engine
3.
Sub-idle fuel control unit (SIFCU)
Sg 2, fr 1
Lesson Organization
a.
Location: mounted to engine gearbox
assembly
b.
Description: meters fuel to spray
nozzles during start cycle to ensure
proper initial acceleration
II.
Engine operating characteristics 1.4.6.2.1
LECTURE NOTES
Sg 2, fr 2
Use the graphic displayed in Sg 2, fr 2, Engine
N1
N2
Turbines
Compressor
Compressor
N2 N 1
Pressure and Temperature, throughout the discussion
Exhaust
Air
Combustion
Exhaust
Intermediate
Intake
Section
Section
Collector
Case
Fairing
on engine operating characteristics.
P
P
P
P
P
P
P
Air
0
1
2
3
45
6
T0
T1
T2
T3
T4 T5 T6
and Exhaust
ENGINE PRESSURE AND TEMPERATURE
A.
Engine
ENGINE PRESSURE AND
TEMPERATURE
1.
Air intake and compression
a.
stages with a 2.5:1 pressure ratio
(1) Compresses intake air for N2
compressor (acts as turbocharger)
(2) Output split between N2
compressor and annular bypass
duct, with 40% bypassed
to exhaust nozzle
b.
stages with a 4.4:1 pressure ratio,
which raises air pressure and
discharges it into combustion chamber
Page 2-4
(8-03) Original
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