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levers. Lever position is monitored by the FADEC which uses the information to
compute a target thrust rating. Thrust indications are displayed on the EICAS primary
page.
Thrust Control --- Thrust Levers
Figure 20---20---1
Take--Off / Go--Around
(TOGA) Switches
Momentary pushbutton
switches associated with
the take--off / go--around
mode of the flight director.
Idle / Shutoff Release Latches
Lift to advance thrust levers
from SHUTOFF to IDLE
positions or to retard throttle
levers from IDLE to SHUTOFF
positions.
Thrust Levers
Controls forward thrust and act
as fuel shut--off. Remains locked
at IDLE position during thrust
reverser operation.
Thrust Lever Friction Adjustment
Adjusts friction on thrust levers. Rotate
control clockwise to increase friction.
Thrust Reverser Levers
NOTE
In the event of an inadvertent
thrust reverser deployment,
the FADEC will electronically
schedule idle thrust. The pilot
must place the thrust lever in
the idle position.
Vol. 1 20--20--2
POWER PLANT
Thrust Control REV 1, Jan 13/03
Flight Crew Operating Manual
CSP C--013--067
Thrust Control --- Throttle Quadrant Setings
Figure 20---20---2
APR THRUST SETTING
TAKE--OFF AND GO--AROUND
THRUST SETTING
CLIMB THRUST SETTING
CRUISE RANGE
IDLE THRUST SETTING
FUEL SHUT--OFF
Thrust Control --- N1 & N2 Readout Scale and Pointer <1001>
Figure 20---20---3
N1 Readout, scale and pointer (green)
Indicates fan speed in percent rpm.
Readout and pointer turn red when
N1 limit is exceeded.
N2 Readout, scale and pointer (green)
Indicates compressor speed in
percent rpm. Readout and pointer
turn red when N2 limit is exceeded.
With wing anti--ice selected on, scale
is displayed in green and white.
Primary Page
Vol. 1 20--20--3
POWER PLANT
Thrust Control REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
B. Full Authority Digital Electronic Control
Each power plant has its own dual channel FADEC computer. One FADEC channel
provides engine control and the other channel operates as a standby channel. Both
channels share information through a cross-channel data link. Channel control is
alternated on each successive engine start.
The FADEC system is powered by the aircraft electrical system until N2 reaches
50% rpm. Above 50% N2 rpm, a gearbox mounted alternator supplies power to the
FADEC.
On the ground, normal-rated takeoff thrust is calculated when electrical power is first
applied to the aircraft. The target N1 is continuously updated for changes in Mach
number, ambient temperature and pressure altitude.
When the thrust lever is placed in idle, the minimum optimal N2 idle rpm is programmed
by the FADEC system. Idle rpm is dependant upon atmospheric information, bleed air
load and phase of flight.
The FADEC computes the optimal target thrust rating for each thrust lever position and
presents the target or maximum value on the N1 gauge of the EICAS primary page.
The thrust mode annunciation on the EICAS primary page identifies the position of the
thrust levers during most phases of operation, or may indicate an armed condition prior
to lift off and on approach. Annunciated thrust modes are: CRZ (thrust levers are in the
cruise range), CLB (the thrust levers are in the climb detent), TO (ground operations or
the thrust levers are in the TOGA detent for takeoff). GA (thrust levers are in the TOGA
detent for in flight go around), MCT (thrust levers are in the climb detent and OEI is
active or high power has been selected), FLX (flex power programmed).
With both engines operating, the thrust levers are normally moved together and a single
thrust mode annunciation is presented. When the thrust levers are moved separately,
the thrust mode annunciation reflects the position of each thrust lever. When the thrust
lever is in the SHUTOFF position, a solid amber line is displayed.
Flex power is routinely used for takeoff when weather and runway conditions are
favorable. Flex thrust takeoffs reduce fuel consumption and extend the usable life of
the engine.
Flex power is selected by entering an assumed temperature on the PERF MENU page
of the FMS CDU. If the FMS is not available, the assumed temperature can be entered
on the EICAS menu page using the EICAS control panel. The assumed temperature
for Flex power can only be entered when:
S The thrust levers are in the IDLE or SHUTOFF detents
S The aircraft has been in a weight on wheels (WOW) configuration for at least one
minute
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