T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
(6) ECA: trims fuel flow to maintain EGT and
Sg 2, fr 65
N1 rpm within limits
Engine Control
Amplifier
(a) Two independent control modules
(lanes), adjust fuel trim in conjunction
with fuel trim solenoid
i)
Each lane operates
independently, with only
one in control
ii)
If one lane fails, green ECA
advisory illuminates, and backup
lane takes control
iii)
If both lanes fail, ECA 2 caution
light illuminates
(b) If either EGT or N1 shaft speed
exceeds operating limits, ECA signals
the FCU, reducing fuel flow
(7) SIFCU: meters fuel to spray nozzles
Sg 2, fr 66
during start cycle to ensure proper initial
SIFCU
b.
Monitoring: fuel flow is automatically controlled
by FCU in conjunction with ECA and throttle
position when FUEL CONTROL switch set to
NORMAL
6.
Manual fuel control system
Sg 2, fr 67
Manual Fuel System
a.
Functional description
(1) Operates similarly to main fuel control, but
automatic engine limiting controls do not
function (FUEL CONTROL switch set to
MANUAL)
(2) Receives fuel from HP fuel pump
(9-98) Original
Page 27-26
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