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in the replenishment tank and is
measured in U.S. quarts.
CRZ
SYNC
temperature in °C.
pressure in psi.
POWER PLANT
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
18−10−15
ENGINE INDICATIONS (CONT'D)
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.
GF1810_024 INTAKE COWL
LEADING EDGE
P20/T20 PROBE
SPINNER
FAN BLADES
OUTLET GUIDE VANE CASING
P50 PRESSURE PROBE
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.
GF1810_025
P20 P50
AIRFRAME
ENGINE
EEC
CHANNEL
A
EEC
CHANNEL
B
DATA
ENTRY
PLUG
P20
1.54
EPR
1.65
CRZ
SYNC
1.54
1.65
POWER PLANT
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
18−10−16
ENGINE INDICATIONS (CONT'D)
EPR Control
EPR control mode is selected on the engine control panel, located on the pedestal. Both EPR or
N1 switches should be the same selection.
GF1810_026
Engine Switches
Used to select engine control mode:
N1 − selects engine control in alternate mode.
EPR − selects engine control in primary mode.
ENGINE
L
N1
EPR
R
N1
EPR
EPR Indication
GF1810_027
Note:
When the EPR readout and
the EPR rating match, the
bugs will blend.
EPR Rating Mode
Displays thrust rating which are selected
automatically or manually. The following
rating modes are available:
Takeoff
( ) mode
NOTE
All indications will be magenta except when MAN or FLEX is selected, in which case
SYNC Mode
Displays synchronized mode as
selected by the FMS.
If autothrottle is engaged SYNC
will appear under N1 and N2
whichever is controlling.
EPR Rating Readout
Displays the EPR numerical
target for the mode selected.
EPR Rating "V" Bug
Displays the target EPR
for the mode selected.
EPR Readout
Displays the current
EPR value.
EPR "T" Readout Bug
Displays the current
EPR command.
Engine Control Mode Box
Displayed when in EPR
control mode.
EPR Sweep Arm
Displays the current
EPR readout.
the indications will be cyan.
1.54
EPR
1.65
CRZ
SYNC
1.54
1.65
Reduced Thrust Takeoff
Mode ( )
POWER PLANT
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
18−10−17
ENGINE INDICATIONS (CONT'D)
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
and the thrust is advanced towards takeoff.
Operation at TO rating is limited to a maximum
of 5 minutes. The TO rating will remain until all of the following conditions are met:
− The airplane is ³ 400 feet above the runway.
− The flaps/slats are retracted.
− The pilot retards the thrust lever (Throttle Lever Angle (TLA) < 37°). This condition does
not apply when autothrottle is engaged.
− If AFCS mode is goaround
or windshear, the rating is automatically set to TO
− If in descent and the flaps/slats or landing gear are extended, the rating will transition
from cruise (CRZ) to TO.
· Reduced Thrust Takeoff
(FLX) Rating − The FLX mode is permissible when airplane weight
and runway conditions are such that full TO rating is not required. FLX thrust is
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