Engine and Related Systems
T-45C TS, ADV & IUT ENG-04
(d) Solenoid (fuel trim): trims basic fuel flow
Overlay 8
in response to engine control amplifier
Solenoid (Fuel Trim)
(ECA) inputs
(e) ACCEL caution light illuminates if
solenoid not in commanded position
(6) ECA: located in lower equipment bay, trims
Overlay 9
fuel flow to maintain EGT and N1 rpm within
ECA
limits
(a) Two independent control modules
(lanes) which 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 (no engine
protection is lost, engine functions
normally)
iii)
If both lanes fail, ECA 2 caution
light illuminates
NOTE: If an ECA lane failure
occurs, a momentary thrust
fluctuation may be experienced.
With a dual lane failure, engine
EGT, fuel flow, and rpm should
be monitored and the throttle
carefully controlled. Manual fuel
control use should be considered
only if a dual lane failure is
indicated and engine instability
exists; for instance, stalls or
surges.
(b) If either EGT or N1 shaft speed
exceeds operating limits, ECA signals
the FCU, reducing fuel flow
Original (9-98)
Page 4-11
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