Embraer EMB145 Operation Manual page 1909

POWERPLANT
ALTERNATE TAKEOFF THRUST CONTROL SYSTEM
During a takeoff, if an engine failure is detected, the ATTCS
automatically resets thrust on the remaining engine from Alternate
Takeoff thrust to Maximum Takeoff thrust. In addition, depending on
takeoff thrust setting and ambient conditions, the FADECs generate an
ECS OFF signal to close the Pack Valves. (Refer to ECU operation on
Section 2-14). The conditions to arm, trigger, or disarm the ATTCS are
described as follows.
ATTCS ARMING CONDITIONS
ATTCS is armed when:
− Both engines are ATTCS capable,
− Associated thrust lever angle is equal to or higher than 45°.
NOTE: ATTCS capable is defined as E T/O (A1E engine), T/O
(A1P, A1/3 or A1E engines) or ALT T/O-1 (all engines)
mode selected, with the airplane on ground and the
engine running.
ATTCS TRIGGERING CONDITIONS
After being armed, the ATTCS is triggered under any of the following
conditions:
The thrust lever for the opposite engine is reduced to below 38°
−
TLA.
Either FADEC for the on-side engine receives an opposite
−
engine or on-side engine inoperative condition, or a Thrust
Lever Angle limited to idle signal.
The opposite engine does not indicate ATTCS being armed,
−
within 2 seconds after the on-side engine ATTCS has armed.
The opposite engine disarms ATTCS and the on-side engine
−
does not disarm within 2 seconds.
If ATTCS is armed and either FADEC A or B detects an opposite
engine inoperative condition, the controlling FADEC commands the on-
side engine to a higher takeoff thrust, as shown in the following table:
Page
2-10-50 8
AIRPLANE
OPERATIONS
MANUAL
Code
01
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REVISION 41