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THRUST LEVERS
The thrust lever quadrant incorporates a main lever for setting forward thrust and
reverse thrust, with a finger lift lever for thrust reverser operation, Takeoff/Go Around
(TOGA) switches, autothrottle engage and disengage switches, quick disconnect and
engine run switches.
Pressing the TOGA switches will change the pitch on the command bars on the PFD.
For more information see chapter 2, AFCS.
The autothrottle is engaged by pressing the left or right engage/disengage switch(es).
It is disengaged by a second press of either engage/disengage switch or by pressing
either autothrottle quick disconnect button or by moving the thrust lever manually.
Selecting the ENGINE RUN switches to ON activates fuel pumps, opens the HPSOV
in the fuel management unit and initiates the start sequence. Selecting the ENGINE
RUN switches to OFF deactivates fuel pumps, closes the HPSOV and shuts down the
engine.
Thrust lever movement transmits a signal to a dual channel RVDT. Each channel in the
RVDT is dedicated to an EEC channel. The dedicated generator provides (through the
EEC) the electrical power required for the RVDT to function. The EEC interprets the
RVDT signal as a power demand and adjusts engine parameters accordingly. There is
no mechanical linkage between thrust lever and engine.
L ENG BLEED R ENG BLEED
APU BLEED
AUTO
CLSD OPEN
XBLEED
AUTO
OFF ON
AUTO
OFF ON
AUTO
OFF ON
GX_17_041
17-24 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
MAX
THRUST
IDLE
REV
MAX REV
ENG
RUN
OFF OFF
L R
DEDICATED
GENERATOR
DEDICATED
GENERATOR
CHA
CHA CHA
CHB CHA
CHB
No 1 RVDT No 2 RVDT
CHB
CHB
EEC EEC
AIRCRAFT
ENGINES
FORWARD
GX_17_042
For Training Purposes Only
Sept 04
17-25
P I LOT T R A I N I N G GU I D E
POWER PLANT
MAX
THRUST
IDLE
REV
MAX REV
ENG
RUN
OFF OFF
L R
GX_17_043
MAX THRUST
Maximum Forward Thrust
Reverse Thrust
Lever
Autothrottle
Quick Disconnect
Takeoff/Go Around
(TOGA) Switch
Autothrottle
Engage/Disengage
Switch
TOGA Switch
Autothrottle
Engage/Disengage
Switch
REV
Idle Reverse Thrust
MAX REV
Maximum Reverse Thrust
IDLE
Idle Forward Thrust
Reverse Thrust
Lever
Autothrottle
Quick Disconnect
TOGA Switch
Engine Run
Swicthes
17-26 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
ENGINE PRESSURE RATIO (EPR)
EPR is the primary control mode for thrust setting.
Raw EPR is calculated as a ratio of engine inlet total pressure and engine exhaust total
pressure (P20 and P50) and then trims are applied to generate a fully trimmed EPR for
engine control and display.
The engine inlet total pressure and temperature are sampled at the fan inlet. Engine
inlet total pressure (P20/T20) is used by the EEC. P20 is used by the EEC for control
functions and in the calculation of EPR and Mach number. Temperature sensor (T20)
is used by the EEC for control function and for various EPR related functions.
The core engine exhaust total pressure (P50), in combination with P20/T20, is also
used by the EEC for EPR calculation. P50 air is sensed by four pressure probes,
located on the outlet guide vane assembly. The pressure transducer within the EEC
provides a signal to both channels of the EEC and is temperature compensated. The
data entry plug ensures that both engines display the same EPR for the same actual
engine thrust level.
GX_17_044
Intake Cowl
Leading Edge
TAT Probe
(P20/T20)
Spinner
Fan Blades
VIEW LOOKING FORWARD
ONTOOGV EXIT
Outlet Guide
Vane Casing
Outlet Guide Vane
Trailing Edge
TAT PROBE
(P20 / T20)
P50 Pressure
Probe
For Training Purposes Only
Sept 04
17-27
P I LOT T R A I N I N G GU I D E
POWER PLANT
EPR RATING MODE SELECTION
EPR rating mode is automatically or manually set through the FMS PERF pages on
the FMS. The following modes are available:
• TAKEOFF (TO) Rating - This rating is always set whenever the airplane is on the
ground or whenever an engine failure is detected in flight. TO rating is limited to a
maximum of 5 minutes (10 minutes in the event of an engine failure). Also, if
AFCS mode is go-around or windshear, the rating is also automatically set to TO.
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