Embraer EMB145, Operation Manual

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POWERPLANT
AIRPLANE
OPERATIONS
MANUAL
2-10-40
Page
4
Code
01 REVISION 41
Copyright © by Embraer. Refer to cover page for details.
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N1TARGET CALCULATION
The FADEC calculates the maximum available engine thrust for a
given thrust rating mode, airspeed and ambient conditions, and bleed
air configuration. Maximum thrust corresponds to N1TARGET
displayed on the EICAS as a cyan bug on the N1 analogic indicator
arc.
When the Thrust Lever is set to the THRUST SET position, the
FADEC controls the engine at N1TARGET.
In normal mode (with no ADC faults) the following data are used as
primary reference for the N1TARGET calculation:
−
Pressure Altitude and Mach Number reference from ADCs.
−
Temperature references (REF TO TEMP during takeoff and
ADC TAT in flight).
−
A-ICE condition (REF A-ICE during takeoff and actual A-ICE
system feedback in flight).
−
Takeoff mode.
N1REQUEST CALCULATION
The N1REQUEST is a function of N1TARGET and Thrust Lever Angle.
The FADEC controls the engine to N1REQUEST at steady state,
except if the thrust lever is at Ground Idle position. In this case, the
engine is controlled according to the Ground Idle N2 schedule.
N1REQUEST is shown as a green bug on the N1 analogic indication
arc on the EICAS.
The following table presents the main Thrust Lever positions,
corresponding Thrust Lever Angle bands, and N1REQUEST for
ground operation.
POSITION TLA N1REQUEST
MAX REVERSE 0 to 4° N1REV
MIN REVERSE 14° to 22° N1IDLE
IDLE 22° to 28° N1IDLE
THRUST SET 72° to 78° N1TARGET
MAX THRUST Above 78° N1TARGET
N1REV is the N1 value for MAX REVERSE thrust.
Each thrust lever modulates engine thrust linearly between IDLE and
THRUST SET position. There is no thrust modulation between IDLE
and MIN REVERSE.
N1REQUEST is shown as a green bug on the N1 analogic indication
arc on the EICAS.