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COMPARE FUEL QUANTITY
0THRUST MGT T.O.INIT0
00 THRUST MANAGEMENT0010/010
0BOW
0/170
0 SYNC MODE
AUTO 1.60(TO)
EPR
0FUEL MGT
15820 (00+15
S.E. RANGEO
ABQ
0 RATING MODE
ORS
ORO
ORO
4. To select SYNC mode, select OR line select key on SYNC line and set as required.
00OOOORSYNC MODE 1/1
RETURN0
0N1 0/170
OEPR (ACT)
0N2 OFFO
17-30 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
EPR CONTROL
EPR control mode is selected on the engine control panel, located on the pedestal.
Both EPR or N1 switches must be the same selection.
1.54
1.65
CRZ
EPR
1.54
1.65
ENGINE
L R
EPR
EPR
N1 N1
GX_17_047
Engine Switches
N1
EPR
Used to select
engine control
mode:
• - selects
engine control
in alternate mode.
• - selects
engine control
in primary mode.
EPR Rating “V” Bug
Note:
Displays the target EPR bug for
the rating mode selected.
When the EPR readout and the
EPR rating match, the bugs will
blend.
Epr Rating Mode
Displays thrust rating are selected automatically or manually.
The following rating modes are available:
• Takeoff ( ) mode
• Reduced Thrust Takeoff Mode ( )
• Climb Mode ( )
• Cruise Mode ( )
• Maximum Continuous Thrust Mode ( )
• Manual Mode ( ).
TO
CLB
CRZ
MCT
FLX
MAN
EPR Rating Readout
Displays the EPR readout
for the mode selected.
EPR Readout
Displays the current
EPR readout.
Engine Control Mode Box
Displayed when in EPR
control mode.
EPR “T” Readout Bug
Displays the current
EPR command bug
(throttle position)
EPR Sweep Arm
Displays the current
EPR readout.
Note:
If the EPR rating mode is MAN, the mode, rating
readout and rating V bug will be cyan.
For Training Purposes Only
Sept 04
17-31
P I LOT T R A I N I N G GU I D E
POWER PLANT
N1 (FAN)
The N1 LP compressor (fan) speed is used as the alternate engine control. The N1
signals are used by the EEC for engine control functions and are used by the Engine
Vibration Monitor Unit (EVMU).
N1 is measured by four speed probes per engine, mounted on the front bearing
housing.
Three speed probes are used by the EEC for the following:
• N1 EICAS indication
• N1 redline limiting
• N1 rating control
• Thrust control (reverse thrust)
• Independent Overspeed Protection (IOP) at 111.0% N1 speed
The fourth probe is used by the EVM system for engine vibration indication.
73.3
T/O
N1
SYNC
73.3
GX_17_048
EEC
CHANNEL
A
IOP
CHANNEL
A
IOP
CHANNEL
B
EEC
CHANNEL
B
N1
SPEED
PROBE
N1
SPEED
PROBE
N1
SPEED
PROBE
N1
SPEED
PROBE
ENGINE
VIBRATION
MONITOR
UNIT
AIRFRAME
ENGINE
17-32 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
N1 CONTROL
N1 control mode is selected on the engine control panel, located on the pedestal. Both
switches must be in the same position. N1 can also be selected automatically by the
EEC in the event of an EPR control mode failure. A reversion done by EEC is known
as a soft reversion. As per QRH, both switches should then be selected to N1. A
manual reversion is known as a hard reversion. An amber EICAS message will be
displayed when a failure is detected and a status message will be displayed, when the
control switches have been selected to N1 control manually.
NOTE
When the N1 readout and the N1 rating match, the bugs will
blend.
73.3
T/O
N1
SYNC
73.3
98.5 98.5
L-R FADEC N1 CTL
GX_17_049
ENGINE
L R
EPR
EPR
N1 N1
Soft
Reversion
N1 Rating Readout
Displays the N1 readout
for MAN mode.
N1 Rating “V” Bug
Displays the target N1
bug for MAN mode.
N1 “T” Readout Bug
Displays the current
N1 command bug.
N1 Sweep Arm
Displays the current
N1 readout.
N1 Speed Redline
Displays the maximum N1 speed
allowed and is set at 101.0%.
Should the N1 limits be
exceeded, the sweep arm and
N1 readout will be red.
　
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